Question

How to swap two numbers without third variable in C

Answer 1

#include <stdio.h>
 
int main(void) {
    int a = 3, b = 7, tmp;
     
    printf("a = %d, b = %d\n", a, b);
     
    a = a + b;
    b = a - b;
    a = a - b;
     
    printf("a = %d, b = %d", a, b);
     
    return 0;
 
}
 
   
   
/*
   
run:
   
a = 3, b = 7
a = 7, b = 3
   
*/

 

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Answer 2

#include <stdio.h>
 
int main(void) {
    int a = 4, b = 8, tmp;
     
    printf("a = %d, b = %d\n", a, b);
     
    a = a * b;    
    b = a / b;    
    a = a / b; 
     
    printf("a = %d, b = %d", a, b);
     
    return 0;
 
}
 
   
   
/*
   
run:
   
a = 4, b = 8
a = 8, b = 4
   
*/

 

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