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Complete swap so it exchanges the values of two ints using pointers.
main reads two integers a and b, calls swap(&a, &b), and prints them. After the call, the first printed number should be the original b, then the original a.
Input. Two integers a and b.
Output. b then a, separated by a space.
Constraints
- You must change the values through the pointers. Do not only print in reverse order inside main.
Examples
Input
7 2
Output
2 7
Input
0 9
Output
9 0
Hint
- swap receives int *a and int *b. *a is the first value.
- int tmp = *a; *a = *b; *b = tmp;
Show correct code
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#include <stdio.h>
void swap(int *a, int *b) {
int tmp = *a;
*a = *b;
*b = tmp;
}
int main(void) {
int a, b;
if (scanf("%d %d", &a, &b) == 2) {
swap(&a, &b);
printf("%d %d\n", a, b);
}
return 0;
}
main.cC17 · gcc · Ctrl + Enter runs
ResultIdle
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