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Your own C++ basic Calculator
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SmarterDen3
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PostPosted: Wed Feb 27, 2008 8:49 pm    Post subject: Your own C++ basic Calculator Reply with quote
Code:
// i/o example

#include <iostream>
using namespace std;

int main ()
{
  int i; // i- short for integer/int
  cout << "Please enter an integer value: ";
  cin >> i;
  cin.get();
  cout << "The value you entered Smartz one. " << i;
  cout << " and The final answer is..??? " << i%3 << ".\n"; //% can be changed to +,-,/, %,* modulo, the 3 stands for the number to +,-,/,*,%

  cin.get();
  return 0;
}



Its a basic one. Very Happy
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Last edited by SmarterDen3 on Wed Feb 27, 2008 8:51 pm; edited 1 time in total
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Madman
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PostPosted: Wed Feb 27, 2008 8:50 pm    Post subject: Reply with quote
There is a programming section.

People are posting too general of topics in the Computer Talk section.
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SF
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PostPosted: Wed Feb 27, 2008 8:52 pm    Post subject: Reply with quote
Moved.
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SmarterDen3
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PostPosted: Wed Feb 27, 2008 8:52 pm    Post subject: Reply with quote
Sorry.. Very Happy Didnt see the programming section

/Slaps*
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hcavolsdsadgadsg
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PostPosted: Wed Feb 27, 2008 9:13 pm    Post subject: Reply with quote
Rolling Eyes at the very least let the user pick the option.
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Mynameisnick
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PostPosted: Sat Mar 01, 2008 12:17 am    Post subject: Reply with quote
(this works with windows computers and im not sure about the rest)you know you have a built in calculator if you click start then go to all programs then accessories and click calculator,there you go and the next time just go to the start menu
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MrNeef
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PostPosted: Sat Mar 01, 2008 7:34 pm    Post subject: Reply with quote
Code:
#include <iostream>
#include <string> // We will be using a string, so this will come in handy!

using namespace std;

int main ()
{

   while ( 1 == 1 ) { // Infinite loop

   float f; // First value
   float s; // Second value
   string op; // Operator string

   cout << "First value: "; // Says the user to enter their first value
   cin >> f; // Gets first value from the user
   cout << "Operator ( -, +, / or * ): "; // Says the user to enter their operator
   cin >> op; // Gets operator from the user
   cout << "Second value: "; // Says the user to enter their second value
   cin >> s; // Gets second value from the user

   if ( op == "-" ) { // If users operator choise is - then..
cout << f << op << s << " = " << f-s << endl; // Calculate first value minus second value
   }

   else if ( op == "+" ) { // If users operator choise is + then..
cout << f << op << s << " = " << f+s << endl; // Calculate first value plus second value
   }

   else if ( op == "/" ) { // If users operator choise is / then..
cout << f << op << s << " = " << f/s << endl; // Calculate first value devided by second value
   }

   else if ( op == "*" ) { // If users operator choise is * then..
cout << f << op << s << " = " << f*s << endl; // Calculate first value times second value
   }

cout << "\n\n"; // Adds 2 new lines
   }

  system("pause");
  return 0;
}


I made this quickly, so I didn't add any comments. This will let the user choose the operator Very Happy

EDIT //
Added comments, didn't test it yet, should work though!
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samuri25404
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PostPosted: Sat Mar 01, 2008 9:12 pm    Post subject: Reply with quote
Try making it evaluate mathematical sentences (like "5 * (4 + 7) - 6 * (9 + 2) ).

Then maybe move on from there to things like linear equations.

A simple four-function isn't really anything to be proud of (no offense).

Edit:

Whoops, I was looking at the post above me. Though, the OP isn't really much to be proud of either. ._.
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MrNeef
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PostPosted: Sat Mar 01, 2008 9:20 pm    Post subject: Reply with quote
samuri25404 wrote:
Try making it evaluate mathematical sentences (like "5 * (4 + 7) - 6 * (9 + 2) ).

Then maybe move on from there to things like linear equations.

A simple four-function isn't really anything to be proud of (no offense).

Edit:

Whoops, I was looking at the post above me. Though, the OP isn't really much to be proud of either. ._.


I'm not proud of it. I made it up quickly... you could edit it to your wishes. Also I'm still learning C++, sorry for not being '1337'.
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Br1tn3y
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PostPosted: Sat Mar 01, 2008 9:21 pm    Post subject: Reply with quote
What happens when you divide by 0?
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hcavolsdsadgadsg
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PostPosted: Sat Mar 01, 2008 9:31 pm    Post subject: Reply with quote
Likely a crash.
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systat
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PostPosted: Sun Mar 02, 2008 6:28 am    Post subject: Reply with quote
my own...

Code:
#include <iostream>
#include <cmath>
using namespace std;

int main(int argc, char *argv[]) {
   if(argc<4) {
      cerr << "Not enough parameters!" << endl;
      return 1;
   }
   double operand1=atof(argv[1]);
   char operatorl=*argv[2];
   double operand2=atof(argv[3]);
   switch(operatorl) {
      case('+'):
         cout << (operand1 + operand2) << endl;
         break;
      case ('-'):
         cout << (operand1 - operand2) << endl;
         break;
      case ('*'):
         cout << (operand1 * operand2) << endl;
         break;
      case ('/'):
         cout << (operand1 / operand2) << endl;
         break;
      default:
         cerr << "Unknown operator " << operatorl << endl;
         return 1;
   }
   return 0;
}

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AtheistCrusader
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PostPosted: Sun Mar 02, 2008 6:42 am    Post subject: Reply with quote
Very basic
but still good for beginning

oftopic:

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Santtu K
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PostPosted: Sun Mar 02, 2008 12:37 pm    Post subject: Reply with quote
hahha I beat yours mines 5 functional :3
wrote this in like few mins, nothing special

Code:
#include <iostream>
// 5 functional calculator... sky

using namespace std;

int main()
{
  int f: // function
  int z; // 1st number
  int y; // 2nd number
  int a; // answer
   cout <<"Please enter 1st number: \n"; // asks user to type 1st number
    cin >> z:
     cin.ignore();
   cout <<"Please enter 2nd number: \n"; // asks user to type 2nd number
    cin >> y;
     cin.ignore();
   cout <<"Please Enter the function you want to use (+,-,*,/,%): \n";
    cin >> f; //  above asks user to type function to use
     cin.ignore();

  if ( f = "+" ) { // adding
  (a = z + y);
   cout <<"Answer: "<< a << \n";
    cin.get(); 
}
 else if ( f = "-" ){ // subtraction
  (a = z - y);
   cout <<"Answer: "<< a << \n";
    cin.get();
}

 else if ( f = "*" ){ // multiplication
  (a = z * y);
   cout <<"Answer: "<< a << \n";
    cin.get();
}

 else if ( f = "/" ){ // division
  (a = z / y);
   cout <<"Answer: "<< a << \n";
    cin.get();
}

 else ( f = "%" ){ // percentage calculation
  (a = 100 / z * y);
   cout <<"Answer: "<< a << %\n";
    cin.get();
}

}


next step to add cos, sin and tan
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SmarterDen3
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PostPosted: Wed Oct 15, 2008 6:19 pm    Post subject: Reply with quote
yea i remember this a long time ago, from this point i gained a lot of things.
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