C Program to swap two numbers without third variable

#include"stdio.h"
#include"conio.h"
void main()
{
int a,b;
clrscr();
printf("\nEnter value for a: ");
scanf("%d",&a);
printf("Enter value for b: ");
scanf("%d",&b);
a=a+b;
b=a-b;
a=a-b;
printf("\na= %d\nb= %d",a,b);
getch();
}

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[srakcoding]

#include<stdio.h>
#include<conio.h>
void main()
{
int a, b;
clrscr();
printf("\nEnter value for a: ");
scanf("%d", &a);
printf("Enter value for b: ");
scanf("%d", &b);
a=a+b;
b=a-b;
a=a-b;
printf("\na= %d\nb= %d", a, b);
getch();
}