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  1. Prepare
  2. C
  3. Arrays and Strings
  4. Array Reversal
  5. Discussions

Array Reversal

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  • soumyashivankar1
     + 0 comments

    include

    int main() { int n; scanf("%d",&n);

    int arr[n];

for(int i=0;i<n;i++){

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

return 0;

    }

  • chris456
     + 0 comments

    You guys over complicate so much 

    #include <stdio.h>
#include <stdlib.h>

int main()
{
    int num, *arr, i;
    scanf("%d", &num);
    arr = (int*) malloc(num * sizeof(int));
    for(i = 0; i < num; i++) {
        scanf("%d", arr + i);
    }


    /* Write the logic to reverse the array. */
    int *myarr = (int*) malloc(num * sizeof(int));
    for(int i = num-1; i >= 0; i--){
        printf("%d ", arr[i]);
        myarr[i] = arr[i];
    }

    return 0;
}

  • gagandeep982006
     + 0 comments
    wihtout using the third variable

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int num, *arr, i;
    scanf("%d", &num);
    arr = (int*) malloc(num * sizeof(int));
    for(i = 0; i < num; i++) {
        scanf("%d", arr + i);
    }

    for(i = 0; i<num/2;i++){
        arr[i] = arr[i] + arr[num-1-i];
        arr[num-1-i] = arr[i] - arr[num-1-i];
        arr[i] = arr[i] - arr[num-1-i];
    }
    

    for(i = 0; i < num; i++)
        printf("%d ", *(arr + i));
    return 0;
}

  • mohammedasifsha2
     + 0 comments

    include

    include

    int main() { int num, arr, i; scanf("%d", &num); arr = (int) malloc(num * sizeof(int)); for(i = 0; i < num; i++) { scanf("%d", arr + i); }

    /* Write the logic to reverse the array. */
   for(i = 0; i < num / 2; i++) {
    temp = arr[i];
    arr[i] = arr[num - i - 1];
    arr[num - i - 1] = temp;
}


for(i = 0; i < num; i++)
    printf("%d ", *(arr + i));
    free(arr);
return 0;

    }

  • colicharis1
     + 0 comments

    Saw a lot of code that prints the array just in reverse which is a perfect solution for this problem. If you want to actually reverse the array in your code and use it further I implemented the reversal with a xor swap. This way you don't need a temporary array or variable.

    include

    include

    int main() { int num, arr, i; scanf("%d", &num); arr = (int) malloc(num * sizeof(int)); for(i = 0; i < num; i++) { scanf("%d", arr + i); }

    /* Write the logic to reverse the array. */

// reverse array using xor swap
for(i = 0; i < num / 2; i++) {
    // implement xor swap
    // a, b
    // a = a^b
    // b = a^b
    // a = a^b
    // a and b values are swapped
    arr[i] = arr[i] ^ arr[num - i - 1];
    arr[num - i - 1] = arr[i] ^ arr[num - i - 1];
    arr[i] = arr[i] ^ arr[num - i - 1];
    }


for(i = 0; i < num; i++)
    printf("%d ", *(arr + i));

free(arr);

return 0;

    }