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  • PASSING ARGUMENT TO A FUNCTION BY VALUE IN C

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    Passing argument to a function by value is also know as call by value. This method of passing arguments to a function copies the original value of argument into the formal parameter of a function. In other words if we change parameter which are given inside a function posses no effect on the argument .

    C language support by default call by value for passing arguments.

    Below is the example of how to pass argument by value.

     // function definition for swapping two  integer type values a and b
    void swap(int a, int b) 
    {      
    
       int t;
    
       t = a;                                    //  t variable save the value of  a
       a = b;                                    // we put value of b into a 
       b = t;                                     // put t into b 
    
       return;
    }
    
    Now, we call the function swap() by passing original values . 
    
    #include <stdio.h>
    
    
    void swap(int a, int b);    
    
    int main () {
    
    
       int x = 5;   //    local variable definition 
       int y = 6;
    
       printf("Before swap, value of x : %d\n", x );
       printf("Before swap, value of y : %d\n", y );
    
       //  Now we are calling a function to swap two values 
    
        swap(x, y);
    
       printf("After swap value of x : %d\n", x );
       printf("After swap value of y : %d\n", y );
    
       return 0;
    }
    
    
    Before swap value of x :5
    Before swap value of y :6
    After swap value of x :5
    After swap value of y :6
    

    This shows that if we change parameter which are given inside a function posses no effect on the argument .

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