Actual and former parameter C Language

As we know C language is building block of function. Anything done in C language by function. Function can take argument. There are two types of argument given below.

• Argument pass while calling is actual
• Argument while declaring function is former

#include<stdio.h>

#include<conio.h>

/*##########################

     Girfa Student Help

     Formal and actual parameter program

  ##########################*/

int sum(int,int);

void main()

{

     int a,b,c;

     clrscr();

     a=10;

     b=20;

     c=sum(a,b);   /* a and b are actual parameter */

     printf("\n\tA=%d\n\tB=%d\n\tSum=%d",a,b,c);

     getch();

}

int sum(n1,n2) /* n1,n2 are formal parameter */

{

     return n1+n2;

}

In the function main in the example above, a, and b are all actual parameters when used to call calculate sum function. On the other hand, the corresponding variables in sum_funcation definition (namely n1, n2) are all formal parameters because they appear in a function definition.

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