Question

How to swap two numbers in C

Answer 1

#include <stdio.h>

int main(void) {
    int a = 3, b = 7, tmp;
    
    printf("a = %d, b = %d\n", a, b);
    
    tmp = a;
    a = b;
    b = tmp;
    
    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 = 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 3

#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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