Question

How to loop through an array backward in C

Answer 1

#include <stdio.h>

int main() {
    int arr[] = {1, 2, 3, 4, 5};
    int size = sizeof(arr) / sizeof(arr[0]);

    for (int i = size - 1; i >= 0; i--) {
        printf("%d ", arr[i]);
    }
}



/*
run:
   
5 4 3 2 1 
            
*/

 

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Answer 2

#include <stdio.h>

int main() {
    int arr[] = {1, 2, 3, 4, 5};
    size_t size = sizeof(arr) / sizeof(arr[0]);

    for (size_t i = size; i--;) {
        printf("%d ", arr[i]);
    }
}



/*
run:
   
5 4 3 2 1 
            
*/

 

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