Function Definition

Examples of function definitions

/*****************************************
** Function: Square()
** This function squares a number of type double and returns it.
**
** Inputs: a value to be squared
** Outputs: returns the square of the number provided
****************************************/

double Square (double n) 
{ 
    return (n * n);
}

/**************************************************
** Function: FindMinimum ()
**   This function finds the minimum of two integers
**   and returns the smaller of the two values.
**
** Inputs: integers n1 and n2 to be compared
** Outputs: returns the smaller of n1 and n2.
**          returns n2 if values are equal
**************************************************/
int FindMinimum (int n1, int n2) 
{
    int min;

    if (n1 < n2) 
    {
        min = n1;
    } 
    else 
    {
        min = n2;
    }

    return min;
}

General form

return-type Name (p1, p2, ... pn) 
{
    statements
}

• return-type is the datatype of the value returned by function.
• Name is the function's name
• p_i's specify the functions parameters and give the parameter's type and name

Return statement

• Form: return exp; or return;
• When evaluated, causes the function to stop and returns the value of exp back to the calling function, or , in the second case, just returns program contol back to the calling function.