#include <stdio.h>
enum { SIZE = 12 };
int main() {
int A[SIZE];
for (int i = 0; i < SIZE; i++) {
scanf("%d", &A[i]);
}
for (int i = 0; i < 2; i++) {
int temp = A[i];
A[i] = A[3 - i];
A[3 - i] = temp;
}
for (int i = 5; i < 7; i++) {
int temp = A[i];
A[i] = A[13 - i];
A[13 - i] = temp;
}
for (int i = 9; i < 11; i++) {
int temp = A[i];
A[i] = A[21 - i];
A[21 - i] = temp;
}
for (int i = 0; i < SIZE; i++) {
printf("%d ", A[i]);
}
return 0;
}
This code reads 12 integers into an array, then performs three separate swapping operations on specific pairs of elements, and finally prints the array. The swapping loops appear to be trying to reverse certain groups of elements, but the indices used may not be correct for the intended behavior.
- Check the indices in the first swapping loop: when i is 0, it swaps A[0] with A[3]; when i is 1, it swaps A[1] with A[2]. This reverses the first four elements (indices 0-3). Verify if this matches what you intended for that group.
- For the second and third loops, examine the expressions 13 - i and 21 - i. For i=5, 13-5=8, and for i=6, 13-6=7. This swaps A[5] with A[8] and A[6] with A[7], reversing indices 5-8. Similarly, the third loop with 21-i gives indices 12 and 11 for i=9 and 10, but the array only goes up to index 11. This means A[12] is out of bounds, which is an error. Think about what the correct upper index should be for reversing the last group of four elements.