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  1. #include <stdio.h>
  2.  
  3. #define Square(x) ((x)*(x))
  4.  
  5. int main() {
  6. int x = 5;
  7. printf("%d\n", Square(x++));
  8. printf("x now is %d!\n", x);
  9. return 0;
  10. }
  11.  
Success #stdin #stdout 0s 1788KB
stdin
Standard input is empty
stdout
25
x now is 7!