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Calling Functions

Posted on 2000-04-19
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Last Modified: 2010-04-02
What is the right way to call a function in a program?
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Question by:SBuntin
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4 Comments
 
LVL 22

Accepted Solution

by:
nietod earned 120 total points
ID: 2731978
you use the functin name a left parenthises, then any parameters, then a right parenthesis.

example follows.
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LVL 22

Expert Comment

by:nietod
ID: 2731985
// no parameters.
int GetZero()
{
   return 0;
}

// 1 parameter.
int Increment(int i)
{
   return i +1;
};

// 2 parameters.
int Add(int x,int y)
{
   return x + y;
};

     *    *    *

int x = GetZero();
int y = Increment(x);
int z = Add(x,y);

Let me know if you have any questions.
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Author Comment

by:SBuntin
ID: 2735885
I am having problems linking or something...I really don't know what it is saying...

Here is my problem whats wrong:

#include <iostream.h>
#include <math.h>

void DegreesToRadians();
void RadiansToDegrees();

int main()
{
      int convert;
      int degree, radian;


      cout << "What would you like to convert to?\n";
      cout << "1. Degrees to Radians";
      cout << "2. Radians to Degrees";
      cin >> convert;

      if (convert == 1)
      {
            // Input
            cout << "Degrees? ";
            cin >> degree;

            // Calculations and Output
            DegreesToRadians();
      }

      if (convert == 2)
      {
            // Input
            cout << "Radians? ";
            cin >> radian;

            // Calculations and Output
            RadiansToDegrees();


      }


return 0;
}




float DegreesToRadians(float degree)
{
  float pi = 22 / 7;
  float totalb = degree * (pi/180);

  return totalb;
}

float RadiansToDegrees(float radian)
{
      float pi = 22 / 7;
      float totalB = radian * (180/pi);

      return totalB;
}
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LVL 22

Expert Comment

by:nietod
ID: 2742552
The forward declarations of the 2 conversion functions do not match the function definitions.  Both the definitions take floats as parrameters and return floats as return values.  but your forward definitions take no parameters and return no values.  You should change them to

float DegreesToRadians(float);
float RadiansToDegrees(float);
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