When calling a function in C, arguments can be passed in two ways, by calling by value and by calling by reference. This tutorial guides you about these two ways to pass parameters to a function and demonstrates them with examples.
| Type | Description |
|---|---|
| Call by Value |
|
| Call by Reference |
|
Call by Value
Example:
#include<stdio.h>//function declarationint addition(int num1, int num2);int main(){ //local variable definition int answer; int num1 = 10; int num2 = 5; //calling a function to get addition value answer = addition(num1,num2); printf("The addition of two numbers is: %d\n",answer); return 0;}//function returning the addition of two numbersint addition(int a,int b){ return a + b;}Program Output:
The addition of two numbers is: 15
Call by Reference
Example:
#include<stdio.h>//function declarationint addition(int *num1, int *num2);int main(){ //local variable definition int answer; int num1 = 10; int num2 = 5; //calling a function to get addition value answer = addition(&num1,&num2); printf("The addition of two numbers is: %d\n",answer); return 0;}//function returning the addition of two numbersint addition(int *a,int *b){ return *a + *b;}Program Output:
The addition of two numbers is: 15