Pass By Reference Definition
- Each parameter was followed by an ampersand sign (&). (&) will pass an address of the original variable instead of by value.
- In Passed by reference, the original variable and the function variable use the same memory/variable for the parameter. If the function variable modifies the parameter value, the effect is visible to the original variable.
Syntax
//Function - Pass By Reference
void fn_name(int *var1,int *var2)
{
// Code
}
//Main Code- Pass By Reference
fn_name(&orginal_var1,&orginal_var2);
Simple Example Program for Passing pointers to functions
/*##Simple Example Program for Passing pointers to functions In C*/
/*##Simple Add Numbers Programs,pointers Example C Programming*/
/*##Pass By Referense Function Example Program In C Programming*/
#include <stdio.h>
// Declare Add Numbers Function Using Pointer
void add_numbers(int *value1, int *value2, int *result) {
*result = *value1 + *value2;
}
int main() {
// Declare Variables
int number1, number2, result = 0;
// Read User Input
printf("Enter value of Number # 1: ");
scanf("%d", &number1);
printf("Enter value of Number # 2: ");
scanf("%d", &number2);
//Print Values Pass to Reference
printf("Before Pass to Reference : Number # 1=%d, Number # 2=%d, Result # :%d \n", number1, number2, result);
//Call add_numbers Function By Passing Reference
add_numbers(&number1, &number2, &result);
//Print Values Pass to Reference
printf("After Pass to Reference : Number # 1=%d, Number # 2=%d, Result # :%d\n", number1, number2, result);
return 0;
}
Sample Output
Enter value of Number # 1: 5
Enter value of Number # 2: 6
Before Pass to Reference : Number # 1=5, Number # 2=6, Result # :0
After Pass to Reference : Number # 1=5, Number # 2=6, Result # :11
