call by value

Call By Value:

Actual parameters are to the function. Whatever the modifications are done in function, those changes are not reflects in calling function.

Ex: add(a,b);

Example Program:

void main()

{

 int add(int,int);

 int a,b,c;

 a=2;

 b=3;

 c=add(a,b); //calling function

 printf("c=%d\n",c);

}

int add(int a,int b)

{

  int c;

  c=a+b;

  return(c);

}

next call by reference

Function call

rules for the functions