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Swapping two numbers without using third variable

#include<stdio.h> 
int main(){
      int a,b;
      printf("\n Enter value for A=");
      scanf("%d",&a);
      printf("\n Enter value for B=");
      scanf("%d",&b);
      a=b-a;
      b=b-a;
      a=a+b;
      printf("New values ....");
      printf("A=%d\n",a);
      printf("B=%d\n",b);
      return 0;
} 
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