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  1. #include <stdio.h>
  2.  
  3. #define SWAP1(x,y) (x = x ^ y ,  y = x ^ y ,  x = x ^ y )
  4. #define SWAP2(x,y) (x^=y^=x^=y)
  5. #define SWAP3(x,y) (x^=y^=x^=y^=x^=y^=x^=y^=x^=y)
  6.  
  7.  
  8. int main(void) {
  9.  
  10. 	int a = 5, b=-30;
  11. 	printf("Original a=%d, b=%d\n",a,b);
  12. 	SWAP1(a,b);
  13. 	printf("SWAP1 -> a=%d, b=%d\n",a,b);
  14. 	SWAP2(a,b);
  15. 	printf("SWAP2 -> a=%d, b=%d\n",a,b);
  16. 	SWAP3(a,b);
  17. 	printf("SWAP3 -> a=%d, b=%d\n",a,b);
  18. 	return 0;
  19. }
  20.  
Success #stdin #stdout 0s 5260KB
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stdin
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Standard input is empty
stdout
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Original a=5, b=-30
SWAP1 -> a=-30, b=5
SWAP2 -> a=5, b=-30
SWAP3 -> a=-30, b=5
https://ideone.com/Kbe1KD
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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