Before Swapping :
a = 10
b = 2
After Swapping:
a = 2
b = 10
To do the swapping we have different approaches.
1. Swapping using a temporary variable
2. Swapping without using a temporary variable
3. Swapping using pointers
NOTE: We do not use of the second method in embedded system software writing. Because it would have to execute more instructions to perform the same operation with a temporary variable.
Swapping using a temporary variable
#include <stdio.h>
#include <stdlib.h>
int main(void) {
int a = 10;
int b = 3;
int temp = 0;
printf("Before Swapping");
printf("\na = %d\tb = %d\n",a,b);
temp = a;
a = b;
b = temp;
printf("After Swapping");
printf("\na = %d\tb = %d\n",a,b);
return EXIT_SUCCESS;
}
Swapping without using a temporary variable
#include <stdio.h>
#include <stdlib.h>
int main(void) {
int a = 10;
int b = 3;
int temp = 0;
printf("Before Swapping");
printf("\na = %d\tb = %d\n",a,b);
a = a - b;
b = a + b;
a = b - a;
printf("After Swapping");
printf("\na = %d\tb = %d\n",a,b);
return 1;
}Swapping using pointers
When the memory size is very limited we prefer to do this.
#include <stdio.h>
#include <stdlib.h>
int main(void) {
int a = 10;
int b = 3;
int temp;
int *x , *y;
printf("Before Swapping");
printf("\na = %d\tb = %d\n",a,b);
x = &a;
y = &b;
temp = *x;
*x = *y;
*y = temp;
printf("After Swapping");
printf("\na = %d\tb = %d\n",a,b);
return 1;
}
Leave a Reply