Table of Contents
Call by Value Program in C
- Call by Value Program in C is a method of passing the arguments to function and call the function in main( ) method.
- In tutorial we have discussed the concept of formal argument and actual argument.
- We have explained the concept of call by value method with help of an example.
- Call by value program in C is also executed with output.
Frequently Asked Questions
- What is actual arguments in c ?
- What is formal arguments in c ?
- What is call by Value in C ?
What are actual arguments ?
Parameters or arguments that are passed to a function at the time of function calling inside the main() function of the program are known as actual arguments.
For example in the c program discussed in this tutorial a and b are the actual arguments.
What are formal arguments ?
Parameters or arguments that are passed to a function at the time of function definition are known as actual arguments.
For example in the c program discussed in this tutorial x and y are the actual arguments.
What is call by Value method ?
In call by value method the value of actual arguments does not change if we change the value of formal parameters.
C Program for Call Value method is given below
#include <stdio.h>
void swap(int x , int y); // function declaration
int main()
{
int a = 10;
int b = 20;
printf(“Before swapping the values in main a = %d, b = %d\n”,a,b);
swap(a,b); // function calling
parameters in call by value, a = 10, b = 20
printf(“After swapping values in main a = %d, b = %d\n”,a,b);
}
void swap (int x, int y)
{
printf(“before swapping value of x =%d and y = %d\n”,x,y);
int temp;
temp = x;
x=y;
y=temp;
printf(“After swapping value of x =%d and y = %d\n”,x,y);
}
Output
When we will execute above call by value program in c then following output will be generated.
When we execute the above call by value program then in the output we found that by changing the value of formal arguments x and y the value of actual arguments a and b does not change value of actual argument a and b remain same after swapping.
Conclusion and Summary
- In this tutorial we have explained the concept of actual arguments and formal arguments in c.
- Call by value program in c is also explained in this tutorial.
Next Tutorial – Call by Reference Program in C
