CodedFX Design Community -> Simple Console Calculator

Bytes Tech Community, We heart tech!

Search Members Store Arcade Referral Rep Upload Contact Affiliates

CodedFX Design Community > Web Development > Coding Tutorials

Reply to this topic

Start new topic

Start Poll

Outline · [ Standard ] · Linear+

Simple Console Calculator, C++

Track this topic | Email this topic | Print this topic

Weebs	Jun 5 2005, 05:04 AM Post #1
Advanced Member Group: Members Posts: 75 ------------------ Donate CFX Creds CFX Credits: 75 ------------------ Member No.: 31 Reputation: 1 pts	Ok first I'm going to teach you how to create a console based calculator :blink: First your going to need Dev-C++ which you can get here Now that you've gotten that installed you will now be able to create your handy-dandy-programs. Now click File > New > Project. Then select Console Application and name it "Calculator" and click ok. Now when you start off you will see this CODE #include <cstdlib> #include <iostream> using namespace std; int main(int argc, char argv[]) { system("PAUSE"); return EXIT_SUCCESS; } Right now that looks like probably complete jibberish and it pretty much is, but I'm going to explain part of it. #include <cstdlib> and #include <iostream> are "includes" which are used to include files in the program so you can use commands, and you can create your own includes to create your includes. I myself have absoloutly no idea what using namespace std; does. :P int main(int argc, char argv[]) tells the compiler that it is the main part of the program, but I don't know what the int argc stuff is... Arent I such a great teacher? Also, the { basicly tells thats were the int main starts, and the } tells were it ends. system("PAUSE"); and return EXIT_SUCCESS; tell the program to pause after everything is done and displays "Press any key to continue...". So now you probably don't get a word of anything I'm saying because I am a horrid teacher, but if you did get any of that then YAYYY! Ok, now this is a pretty stupid program because it does nothing right? Well by the end of this tutorial we will have made a calculator! Ok the first command i must show you is cout. It is used to display messeges in the console. So now change your program to this CODE #include <cstdlib> #include <iostream> using namespace std; int main(int argc, char argv[]) { cout<<"Welcome to my uber l33t calculator"; system("PAUSE"); return EXIT_SUCCESS; } You may have noticed that all of the lines in the main part of the program have a ; after everything, this is so because it tells the compiler that a new line is being started. So now your program will display "Welcome to my uber l33t calculator" Also, you can create a new line using "\n" You can try it out and watch it for yourself. I also highly reccomend that you manually type the commands in rather than copy + paste because it helps you remember the commands. Also don't forget the ; your program will get errors if you forget it! The next thing I'm going to show you is how to declar a integer. A integer is a variable that holds the value of a number. Now change your program to this CODE #include <cstdlib> #include <iostream> using namespace std; int main(int argc, char argv[]) { int num; cout<<"Welcome to my uber l33t calculator"; system("PAUSE"); return EXIT_SUCCESS; } Now we have declared num, but it doesn't equal anything so now we must give it a value. To do this we do the following CODE #include <cstdlib> #include <iostream> using namespace std; int main(int argc, char argv[]) { int num; num = 7; cout<<"Welcome to my uber l33t calculator"; system("PAUSE"); return EXIT_SUCCESS; } Now num equals 7 :), now I will show you how to display it. When you display variables with the cout command you do not need quotes. So type the following. CODE #include <cstdlib> #include <iostream> using namespace std; int main(int argc, char argv[]) { int num; num = 7; cout<<"Welcome to my uber l33t calculator\n"; cout<<num; cout<<"\n"; system("PAUSE"); return EXIT_SUCCESS; } This will now display num and the \n will make some spaces so it looks less confusing :) They're is also anather way to give num a value, but asking the user for an input. We do this by using the cin command. So change your program to this. CODE #include <cstdlib> #include <iostream> using namespace std; int main(int argc, char argv[]) { int num; cout<<"Welcome to my uber l33t calculator\n"; cout<<"Enter a number\n"; cin>>num; cout<<"You entered:\n"; cout<<num; cout<<"\n"; system("PAUSE"); return EXIT_SUCCESS; } This will allow the user to enter a number and then be displayed. Notice that in cin you use >> unlike in cout you use << . Now I will teach you how to use the mathmatical operator addition. Now change your program to this. CODE #include <cstdlib> #include <iostream> using namespace std; int main(int argc, char argv[]) { int num; int numtwo; cout<<"Welcome to my uber l33t calculator\n"; cout<<"Enter a number\n"; cin>>num; cout<<"You entered:\n"; cout<<num; cout<<"\n"; numtwo = num + 7; cout<<num; cout<<" + "; cout<<" 7 "; cout<<" = "; cout<<numtwo; system("PAUSE"); return EXIT_SUCCESS; } And now you auctually know anough to make a addition calculator. In this tutorial I will not show you how to do this because I think the best way for you to learn is just to experiment :D This post has been edited by Weebs: Jun 14 2005, 03:07 AM Ok first I'm going to teach you how to create a console based calculator :blink: First your going to need Dev-C++ which you can get [url=http://prdownloads.sourceforge.net/dev-cpp/devcpp-4.9.9.2_setup.exe]here[/url] Now that you've gotten that installed you will now be able to create your handy-dandy-programs. Now click File > New > Project. Then select Console Application and name it "Calculator" and click ok. Now when you start off you will see this [code]#include <cstdlib> #include <iostream> using namespace std; int main(int argc, char argv[]) { system("PAUSE"); return EXIT_SUCCESS; } [/code] Right now that looks like probably complete jibberish and it pretty much is, but I'm going to explain part of it. #include <cstdlib> and #include <iostream> are "includes" which are used to include files in the program so you can use commands, and you can create your own includes to create your includes. I myself have absoloutly no idea what using namespace std; does. :P int main(int argc, char argv[]) tells the compiler that it is the main part of the program, but I don't know what the int argc stuff is... Arent I such a great teacher? Also, the { basicly tells thats were the int main starts, and the } tells were it ends. system("PAUSE"); and return EXIT_SUCCESS; tell the program to pause after everything is done and displays "Press any key to continue...". So now you probably don't get a word of anything I'm saying because I am a horrid teacher, but if you did get any of that then YAYYY! Ok, now this is a pretty stupid program because it does nothing right? Well by the end of this tutorial we will have made a calculator! Ok the first command i must show you is cout. It is used to display messeges in the console. So now change your program to this [code]#include <cstdlib> #include <iostream> using namespace std; int main(int argc, char argv[]) { cout<<"Welcome to my uber l33t calculator"; system("PAUSE"); return EXIT_SUCCESS; } [/code] You may have noticed that all of the lines in the main part of the program have a ; after everything, this is so because it tells the compiler that a new line is being started. So now your program will display "Welcome to my uber l33t calculator" Also, you can create a new line using "\n" You can try it out and watch it for yourself. I also highly reccomend that you manually type the commands in rather than copy + paste because it helps you remember the commands. Also don't forget the ; your program will get errors if you forget it! The next thing I'm going to show you is how to declar a integer. A integer is a variable that holds the value of a number. Now change your program to this [code]#include <cstdlib> #include <iostream> using namespace std; int main(int argc, char argv[]) { int num; cout<<"Welcome to my uber l33t calculator"; system("PAUSE"); return EXIT_SUCCESS; } [/code] Now we have declared num, but it doesn't equal anything so now we must give it a value. To do this we do the following [code]#include <cstdlib> #include <iostream> using namespace std; int main(int argc, char argv[]) { int num; num = 7; cout<<"Welcome to my uber l33t calculator"; system("PAUSE"); return EXIT_SUCCESS; } [/code] Now num equals 7 :), now I will show you how to display it. When you display variables with the cout command you do not need quotes. So type the following. [code]#include <cstdlib> #include <iostream> using namespace std; int main(int argc, char argv[]) { int num; num = 7; cout<<"Welcome to my uber l33t calculator\n"; cout<<num; cout<<"\n"; system("PAUSE"); return EXIT_SUCCESS; } [/code] This will now display num and the \n will make some spaces so it looks less confusing :) They're is also anather way to give num a value, but asking the user for an input. We do this by using the cin command. So change your program to this. [code]#include <cstdlib> #include <iostream> using namespace std; int main(int argc, char argv[]) { int num; cout<<"Welcome to my uber l33t calculator\n"; cout<<"Enter a number\n"; cin>>num; cout<<"You entered:\n"; cout<<num; cout<<"\n"; system("PAUSE"); return EXIT_SUCCESS; } [/code] This will allow the user to enter a number and then be displayed. Notice that in cin you use >> unlike in cout you use << . Now I will teach you how to use the mathmatical operator addition. Now change your program to this. [code]#include <cstdlib> #include <iostream> using namespace std; int main(int argc, char argv[]) { int num; int numtwo; cout<<"Welcome to my uber l33t calculator\n"; cout<<"Enter a number\n"; cin>>num; cout<<"You entered:\n"; cout<<num; cout<<"\n"; numtwo = num + 7; cout<<num; cout<<" + "; cout<<" 7 "; cout<<" = "; cout<<numtwo; system("PAUSE"); return EXIT_SUCCESS; } [/code] And now you auctually know anough to make a addition calculator. In this tutorial I will not show you how to do this because I think the best way for you to learn is just to experiment :D <span class='edit'>This post has been edited by [b]Weebs[/b]: Jun 14 2005, 03:07 AM</span> Show Smilies Pop Up Window \| Enable Smilies \| Enable Signature

CryptWizard	Jun 5 2005, 10:03 AM Post #2
Loyal Member Group: Members Posts: 232 ------------------ Donate CFX Creds CFX Credits: 232 ------------------ Member No.: 10 Reputation: 3 pts	OK. I'll explain somthing about namespaces in C++. It's basically a "space of names". LOL If you didn't have "using namespace std;" you would have to type something like std::cout<<"someshit"; Now: int main(int argc, char * argv[]) int argc is the ARGument Count char* argv[]/char** argv/char argv[][] is the ARGument Vector. argc is self explanatory argv is an array of strings provided in the command line. eg. If it was invoked with "someprog a b c" argv[0] would be "someprog" argv[1] would be "a" argv[2] would be "b" argv[3] would be "c" Enjoy. OK. I'll explain somthing about namespaces in C++. It's basically a "space of names". LOL If you didn't have "using namespace std;" you would have to type something like std::cout<<"someshit"; Now: int main(int argc, char * argv[]) int argc is the ARGument Count char* argv[]/char** argv/char argv[][] is the ARGument Vector. argc is self explanatory argv is an array of strings provided in the command line. eg. If it was invoked with "someprog a b c" argv[0] would be "someprog" argv[1] would be "a" argv[2] would be "b" argv[3] would be "c" Enjoy. Show Smilies Pop Up Window \| Enable Smilies \| Enable Signature

Gareth	Jun 5 2005, 11:22 AM Post #3
Mr. Bling Bling :P Group: Members Posts: 7,555 Gender: Male ------------------ Donate CFX Creds CFX Credits: 10,736 ------------------ Member No.: 1 Reputation: 184 pts	Very nice weebs, great work ;) Very nice weebs, great work ;) Show Smilies Pop Up Window \| Enable Smilies \| Enable Signature

WinSrev	Jun 5 2005, 12:06 PM Post #4
CodedFx Legend! Group: Coders Posts: 1,420 Gender: Male ------------------ Donate CFX Creds CFX Credits: 9,260 ------------------ Member No.: 2 Reputation: 31 pts	Yeh, Biggest coding tutorial so far and first of C++ i think. :D Yeh, Biggest coding tutorial so far and first of C++ i think. :D Show Smilies Pop Up Window \| Enable Smilies \| Enable Signature

Weebs	Jun 5 2005, 02:26 PM Post #5
Advanced Member Group: Members Posts: 75 ------------------ Donate CFX Creds CFX Credits: 75 ------------------ Member No.: 31 Reputation: 1 pts	Thanks :) I just started C++, so I really don't know much beond integers and strings :( Thanks :) I just started C++, so I really don't know much beond integers and strings :( Show Smilies Pop Up Window \| Enable Smilies \| Enable Signature

WinSrev	Jun 5 2005, 02:30 PM Post #6
CodedFx Legend! Group: Coders Posts: 1,420 Gender: Male ------------------ Donate CFX Creds CFX Credits: 9,260 ------------------ Member No.: 2 Reputation: 31 pts	Keep looking at thoose tutorials, soon you'll know the whole language. :D Keep looking at thoose tutorials, soon you'll know the whole language. :D Show Smilies Pop Up Window \| Enable Smilies \| Enable Signature

CryptWizard	Jun 5 2005, 10:30 PM Post #7
Loyal Member Group: Members Posts: 232 ------------------ Donate CFX Creds CFX Credits: 232 ------------------ Member No.: 10 Reputation: 3 pts	Google Teach yourself C++ in 21 days. The first result Google Teach yourself C++ in 21 days. The first result Show Smilies Pop Up Window \| Enable Smilies \| Enable Signature

Pixelated	Jun 7 2005, 02:32 PM Post #8
Member Group: Members Posts: 39 ------------------ Donate CFX Creds CFX Credits: 59 ------------------ Member No.: 5 Reputation: none	didnt turn out right for me,but then again i have no knowlege of c++ :P im gonna learn it now though :) didnt turn out right for me,but then again i have no knowlege of c++ :P im gonna learn it now though :) Show Smilies Pop Up Window \| Enable Smilies \| Enable Signature

Weebs	Jun 9 2005, 04:06 PM Post #9
Advanced Member Group: Members Posts: 75 ------------------ Donate CFX Creds CFX Credits: 75 ------------------ Member No.: 31 Reputation: 1 pts	I also need to edit some of the code in the turoial, I messed up somewere in the coding, but I can't figure out what is improper in the code... I also need to edit some of the code in the turoial, I messed up somewere in the coding, but I can't figure out what is improper in the code... Show Smilies Pop Up Window \| Enable Smilies \| Enable Signature

Gareth	Jun 9 2005, 05:47 PM Post #10
Mr. Bling Bling :P Group: Members Posts: 7,555 Gender: Male ------------------ Donate CFX Creds CFX Credits: 10,736 ------------------ Member No.: 1 Reputation: 184 pts	QUOTE(Weebs @ Jun 9 2005, 04:06 PM) I also need to edit some of the code in the turoial, I messed up somewere in the coding, but I can't figure out what is improper in the code... CryptWizard will help you, he will kno what the problem is for sure, if you pm him im fairly sure he'll help you :) [quote=Weebs,Jun 9 2005, 04:06 PM]I also need to edit some of the code in the turoial, I messed up somewere in the coding, but I can't figure out what is improper in the code... [right][snapback]822[/snapback][/right] [/quote] CryptWizard will help you, he will kno what the problem is for sure, if you pm him im fairly sure he'll help you :) Show Smilies Pop Up Window \| Enable Smilies \| Enable Signature

Mc2	Jun 12 2005, 10:53 AM Post #11
Member Group: Members Posts: 36 ------------------ Donate CFX Creds CFX Credits: 40 ------------------ Member No.: 35 Reputation: none	Found out, you need to compile it? when i try to, it comes out as a error. Compiler: Default compiler Building Makefile: "C:\Documents and Settings\James\Desktop\Makefile.win" Executing make... make.exe -f "C:\Documents and Settings\James\Desktop\Makefile.win" all make.exe: * No rule to make target `main.exe', needed by `main.o'. Stop. Execution terminated QUOTE(Weebs @ Jun 9 2005, 04:06 PM) I also need to edit some of the code in the turoial, I messed up somewere in the coding, but I can't figure out what is improper in the code... I think its CODE Â int numtwo = num + 7; cuz it wont let me compile it cuz of that. This post has been edited by Brooksie: Jun 12 2005, 11:03 AM Found out, you need to compile it? when i try to, it comes out as a error. Compiler: Default compiler Building Makefile: "C:\Documents and Settings\James\Desktop\Makefile.win" Executing make... make.exe -f "C:\Documents and Settings\James\Desktop\Makefile.win" all make.exe: * No rule to make target `main.exe', needed by `main.o'. Stop. Execution terminated [quote=Weebs,Jun 9 2005, 04:06 PM]I also need to edit some of the code in the turoial, I messed up somewere in the coding, but I can't figure out what is improper in the code... [right][snapback]822[/snapback][/right] [/quote] I think its [code] Â int numtwo = num + 7;[/code] cuz it wont let me compile it cuz of that. <span class='edit'>This post has been edited by [b]Brooksie[/b]: Jun 12 2005, 11:03 AM</span> Show Smilies Pop Up Window \| Enable Smilies \| Enable Signature

Weebs	Jun 13 2005, 03:35 AM Post #12
Advanced Member Group: Members Posts: 75 ------------------ Donate CFX Creds CFX Credits: 75 ------------------ Member No.: 31 Reputation: 1 pts	Hey, your right it is lol :P change int numtwo = num + 7; into numtwo = num + 7; Hey, your right it is lol :P change int numtwo = num + 7; into numtwo = num + 7; Show Smilies Pop Up Window \| Enable Smilies \| Enable Signature

Mc2	Jun 13 2005, 06:52 AM Post #13
Member Group: Members Posts: 36 ------------------ Donate CFX Creds CFX Credits: 40 ------------------ Member No.: 35 Reputation: none	Yay it works now! Yay it works now! Show Smilies Pop Up Window \| Enable Smilies \| Enable Signature

syntax-error	Jun 20 2005, 08:36 PM Post #14
Dedicated Member Group: Members Posts: 515 ------------------ Donate CFX Creds CFX Credits: 515 ------------------ Member No.: 116 Reputation: 9 pts	QUOTE I myself have absoloutly no idea what using namespace std; does. It imports the std library namespace... [quote]I myself have absoloutly no idea what using namespace std; does. [/quote] It imports the std library namespace... Show Smilies Pop Up Window \| Enable Smilies \| Enable Signature

« Next Oldest · Coding Tutorials · Next Newest »

Reply to this topic

Topic Options

Start new topic

1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)

0 Members:

Invision Power Board v2.0.4 © 2009 IPS, Inc.
Licensed to: CodedFX.com