csegmentation-faultdynamic-list

terminated by signal SIGSEGV (Address boundary error)


I am trying to query the user for first a number of inputs, then fill a dynamic list with that number of inputs. Then print them in reverse order. For some reason I get the SIGSEGV error, but I cannot find any infinite loops or address error. Help me find what is wrong.

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

int main() {
    int input;
    printf("Enter a non-negative number: ");
    scanf("%d", &input);

    int *listA;
    listA = (int*)malloc(sizeof(int[input]));
    printf("Now, enter %d non-negative numbers: ", input);
    for (int i = 0; i < input; i++) {
        scanf("%d", listA[i]);
    }
    printf("In reverse order, your input is: ");
    for (int i = input-1; i >=0; i-- ) {
        printf("%d",listA[i]);
    }
    free(listA);
    return 0;
}

Solution

  • Try compiling your code with all warnings enabled (-Wall with gcc). Your line:

    scanf("%d", listA[i]);
    

    should be:

    scanf("%d", &listA[i]);