#include<stdio.h>
int main(){
    int arr[5]={1,2,3,4,5};
    int start=0,end=4;
    int temp;
    while(start<end){
        temp=arr[start];
        arr[start]=arr[end];
        arr[end]=temp;
    }
    printf("reversed:");
    for(int i=0;i<5;i++){
        printf("%d",arr[i]);
    }
    return 0;
}