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C program using call by value//swapping//to interchange value ( C program Coding )

CODING-
//SWAPPING INTERCHANGE CALL BY VALUE
#include<stdio.h>
#include<conio.h>
void swap(int x, int y);
void main()
{
int a=10, b=20;
clrscr();
printf("A before swapping=%d\n",a);
printf("B before swapping=%d\n",b);
swap(a, b);
printf("X after swapping=%d\n",a);
printf("Y after swapping=%d\n",b);
getch();
 }
 void swap(int x, int y)
 {
 int c;
c=x;
x=y;
y=c;
printf("Value of x=%d\n y=%d\n",x,y);
}

 OUTPUT-
A Before swapping=10
B before swapping=20
value of x=20
value of y=10
X after swapping=10
Y after swapping=20
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