Call by reference in C

• https://monitechvenkat1620.blogspot.com/

• Flowchart :

• Program :

#include<stdio.h>
#include<conio.h>
void swapnum ( int *var1, int *var2 )
{
   int tempnum ;
   tempnum = *var1 ;
   *var1 = *var2 ;
   *var2 = tempnum ;
}
void main( )
{
   int num1 = 35, num2 = 45 ;
   clrscr();
   printf("\n----------------CALL BY REFERENCE----------------");
   printf("Before swapping:");
   printf("\nnum1 value is %d", num1);
   printf("\nnum2 value is %d", num2);

 
   swapnum( &num1, &num2 );

   printf("\nAfter swapping:");
   printf("\nnum1 value is %d", num1);
   printf("\nnum2 value is %d", num2);
   getch();
}

• Output :