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pass by value and reference

Anonymous User 866 09-Jul-2018

What is difference between pass by value and pass by reference?

java c#  java 
Updated on 10-Jul-2018
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Prakash nidhi Verma

Prakash nidhi Verma

10-Jul-2018

Pass by value :

       In this we pass copy of actual variables in function as a parameter. Hence any modification on parameters inside the function will not reflect in the actual variable.

example: 

#include<stdio.h>
int main(){
    int a=5,b=10;
    swap(a,b);
    printf("%d%d",a,b);
    return 0;
} 
void swap(int a,int b){
    int temp;
    temp =a;
    a=b;
    b=temp;
}


Pass by reference :

  In this we pass memory address by a reference its actual variables in function as a parameter. Hence, any modification on parameters inside the function will reflect in the actual variable.

#incude<stdio.h>
int main(){
    int a=5,b=10;
    swap(&a,&b);
    printf("%d %d",a,b);
    return 0;
} 
void swap(int *a,int *b){
    int *temp;
    *temp =*a;
    *a=*b;
    *b=*temp;
}

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