Question

How to check if two integers have opposite signs in C

Answer 1

#include <stdio.h>
#include <stdbool.h>

int main() {
    int x = 3, y = -9;            

    bool b = ((x ^ y) < 0); 
    printf("%d\n", b);
    
    x = 5, y = 6;
    
    b = ((x ^ y) < 0); 
    printf("%d\n", b);
}


/*
run:

1
0

*/

 

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Answer 2

#include <stdio.h>
#include <stdbool.h>

int main(void) {
    int x = 8290, y = -1000;              

    bool b = ((x ^ y) < 0);
  
    printf("%s\n", b ? "yes": "no");
      
    return 0;
}
  
  
  
/*
run:

yes

*/

 

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