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What is Call by value in C ?
In this type of function calling the actual value of an argument is passed to formal parameters of the function.
Once a function receives the value then it will start its operation, but this operation will never affect the argument.
Operation will be performed on values but it will not affect argument variables.
Argument value will remain unchanged even after the function’s execution.
Example of call by value in C
#include <stdio.h>
void swap(int a, int b)
{
int temp;
temp = a;
a = b;
b = temp;
}
int main ()
{
int x = 5;
int y = 8;
printf("Value of x before swapping : %dn", x );
printf("Value of y before swapping : %dn", y );
swap(x,y);
printf("Value of x before swapping : %dn", x );
printf("Value of y before swapping : %dn", y );
return 0;
}
Output :
Value of a before swapping : 5
Value of b before swapping : 8
Value of a before swapping : 5
Value of b before swapping : 8
As we can see in the above output the function’s operation will not affect values of argument variables.
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