SRL Archive - C/C++ Help and Tutorials

#include <iostream>

using namespace std;

struct num {
  int num1;
  int num2;
} number;

void getnums(void)
{
    cout << "First Number: ";
    cin >> number.num1;
    cout <<"Second Number: ";
    cin >> number.num2;
}     

int addition (void)
{
  return (number.num1 + number.num2);
}

int subtraction (void)
{
  return (number.num1 - number.num2);
}

int multi (void)
{
  return (number.num1 * number.num2);
}

int divide (void)
{
  return (number.num1 / number.num2);
}

int square (void)
{
  return (number.num1 * number.num1);
}



int main()
{
    string x;
    loop:
    cout << "instructions - type: " << endl;
    cout << "+ to add" << "- to subtract" << endl << "* to multiply" << endl;
    cout << "/ to divide" << endl << "^2 to square" << endl;
    cin >> x;
    getnums();
    switch (x) {
      case '+':
           cout << addition();
           break;
      case '-': 
           cout << subtraction();
           break;
      case '*': 
           cout << multi();
           break;
      case '/': 
           cout << divide();
           break;
      case '^2': 
           cout << square();
           break;
      default:
        cout << "wrong input!";
        goto loop;
    }
    system("PAUSE");
    return EXIT_SUCCESS;
}

if something is not right, tell me how to fix it pl0x :) i did a lot of the things as best as i can think of, and to learn/ try different stuff

i cannot compile this my self for some reason, i keep getting a "all-before does not exist - don't know how to make it" error

also, i would like more ideas on what to make, i am stumpt :(

#include <iostream>

using namespace std;

struct num {
  int num1;
  int num2;
} number;

void getnums(void)
{
    cout << "First Number: ";
    cin >> number.num1;
    cout <<"Second Number: ";
    cin >> number.num2;
}     

int addition ()
{
  return (number.num1 + number.num2);
}

int subtraction (void)
{
  return (number.num1 - number.num2);
}

int multi (void)
{
  return (number.num1 * number.num2);
}

int divide (void)
{
  return (number.num1 / number.num2);
}

int square (void)
{
  return (number.num1 * number.num1);
}



int main()
{
    char x;
    loop:
    cout << "instructions - type: " << endl;
    cout << "'+' to add" << endl << "'-' to subtract" << endl << "'*' to multiply" << endl;
    cout << "'/' to divide" << endl << "'2' to square" << endl;
    cin >> x;
    getnums();
    switch (x) {
      case '+':
           cout << addition()<<endl;
           break;
      case '-': 
           cout << subtraction()<<endl;
           break;
      case '*': 
           cout << multi()<<endl;
           break;
      case '/': 
           cout << divide()<<endl;
           break;
      case '2': 
           cout << square()<<endl;
           break;
      default:
        cout << "wrong input!";
        goto loop;
    }
    system("PAUSE");
    return EXIT_SUCCESS;

}

i changed some stuff around in your main(). it should compile now. you used strings w/o #include <string>. also, idk if one can use strings in a switch() function. (i changed it to a char)

hey sry for the dub post:

#include <iostream>


using namespace std;

struct num {
  float num1;
  float num2;
} number;

void getnums() {
    cout << "First Number: ";
    cin >> number.num1;
    cout <<"Second Number: ";
    cin >> number.num2;
}     

class answer {
      public:
             float addition () {return(number.num1 + number.num2);}
             float subtraction () {return (number.num1 - number.num2);}
             float multi () {return (number.num1 * number.num2);}
             float divide () {return (number.num1 / number.num2);}
             float square () {return (number.num1 * number.num1);}
};

int main() {
    char x;
    loop:
    cout << "instructions - type: " << endl;
    cout << "'+' to add" << endl << "'-' to subtract" << endl << "'*' to multiply" << endl;
    cout << "'/' to divide" << endl << "'2' to square" << endl;
    cin >> x;
    getnums();
    answer ans;
    switch (x) {
      case '+':
           cout << ans.addition()<<endl;
           break;
      case '-': 
           cout << ans.subtraction()<<endl;
           break;
      case '*': 
           cout << ans.multi()<<endl;
           break;
      case '/': 
           cout << ans.divide()<<endl;
           break;
      case '2': 
           cout << ans.square()<<endl;
           break;
      default:
        cout << "wrong input!";
        goto loop;
    }
    system("PAUSE");
    return EXIT_SUCCESS;

}

i just made it look nicer. it uses a class now instead of all those annoying functions. just looks cleaner and is easier to read.

EDIT: changed INTs to FLOATs


EDIT2: when you are programming in C++, you should try and make your main(); as simple and small as possible. i re-adjusted this code so that main(); would be significantly smaller:

#include <iostream>
using namespace std;

int a;
    
class answer {
      struct num {
             float num1;
             float num2;
      } number;
      char x;
      public:
             float addition () {return(number.num1 + number.num2);}
             float subtraction () {return (number.num1 - number.num2);}
             float multi () {return (number.num1 * number.num2);}
             float divide () {return (number.num1 / number.num2);}
             float square () {return (number.num1 * number.num1);}
             void getinput();
             void getnums();
             void switcharoo();                        
};

void answer::getinput() {
    cout << "instructions - type: " << endl;
    cout << "'+' to add" << endl << "'-' to subtract" << endl << "'*' to multiply" << endl;
    cout << "'/' to divide" << endl << "'2' to square" << endl;
    cin >> x;

}    

void answer::getnums() {
    cout << "First Number: ";
    cin >> number.num1;
    cout <<"Second Number: ";
    cin >> number.num2;
} 

void answer::switcharoo() {
     switch (x) {
      case '+':
           cout << addition()<<endl;
           break;
      case '-': 
           cout << subtraction()<<endl;
           break;
      case '*': 
           cout << multi()<<endl;
           break;
      case '/': 
           cout << divide()<<endl;
           break;
      case '2': 
           cout << square()<<endl;
           break;
      default:
        cout << "wrong input!";
        a=0;      
    } 
}
    
int main() {
    answer ans;
    while (a==0) {
         a=1;
         ans.getinput();
         ans.getnums();
         ans.switcharoo();
    }     
    system("PAUSE");
    return 0;
}

if you dont understand anything, please ask.

oo nice. thanks :D

although i still get the error, i think it just has to do with dev-c++(my compiler)

umm idk. i use dev-c++. what error do you get? have u tried creating a new empty project and running it in there?

EDIT: what version do you have?
http://aditsu.freeunixhost.com/dev-cpp-faq.html#allbefore

i have 4.9.9.2, and when i start up dev-c++ i get a box, picuture attatched

e: lol, i never read the box. /me fails

i guess i should try and fix the path thing

http://aditsu.freeunixhost.com/dev-cpp-faq.html#runfile

use the two links i provided. should help fix . (the other link is in my previous post)

fank you :)

id rep, but it says i cant lol

lol np at all. feel free to msg me if you ever have questions.

From: x[Warrior]x3500
lol np at all. feel free to msg me if you ever have questions.

well, i would like more ideas on what else i should make :)

i dont feel like making a game just yet.. something more mathematical or mechanicalised, if you know what i mean :)

hmm no games :( ahh lol. maybe you should make a GUI type of a calculator. no more cmd prompt stuff?

or maybe enhance your calculator: make them enter a line like "5+3" and have the calculator automatically do it. make it a 1 step process.

if you like physics, then you could make a super complicated physics solver. (like from kinematics to thermodynamics)

if you enjoy business, maybe make an accounting program.

oh, i have seen this one done before: make an encryption/decryption password program

is there an explode type of thing? i can do the one line calculator with that. i could also do some formulas i guess, or an f(x) thingy

explode? ugh… idk what u mean by that. but u can use string-streams. and .get/.getline .

From: x[Warrior]x3500
explode? ugh… idk what u mean by that. but u can use string-streams. and .get/.getline .

explode as in the same thing in scar/ php.

explode(';', 'hello;hi');
into
['hello, 'hi'];

in scar :p

From: Awkwardsaw
explode as in the same thing in scar/ php.

explode(';', 'hello;hi');
into
['hello, 'hi'];

in scar :p

oh… duh. lol well yah you dont have a super easy command in c++ for that (at least i dont think so). but you can accomplish the same task with string streams.

alrighty, thanks :)