c Questions about language arrangement

This is Corinne. I want to put the prime numbers in the b array and get it back to zero when it's not a prime number. I think I made the wrong code for the few, but what's the problem?

#include<stdio.h>
#include<string.h>
int main() {
    int n, j, i, a[20] = { 0 }, s[20] = { 0 }, b[20] = { 0 }, cnt = 0;
    scanf_s("%d", &n);
    for (i = 0;i < n;i++) {
        scanf_s("%d", &a[i]);
    }
    for (i = 0;i < n;i++) {
        for (j = 1;j < a[i];j++) {
            if (a[i] % j == 0) {
                cnt++;
            }
        }
        if (cnt == 1) {
            b[i] = a[i];
    }

    for (i = 0;i < n;i++) {
        printf("%d ", b[i]);
    }

    return 0;
}// Enter code here

c++

2022-09-20 19:19

1 Answers

This is because there is no part that initializes cnt to zero while looping.

Please refer to the code below.

#include<stdio.h>
#include<string.h>

int main()
{
    int n = 0, cnt = 0;
    int a[20] = { 0 }, b[20] = { 0 };

    scanf_s("%d", &n);

    for (int i = 0; i < n; i++)
        scanf_s("%d", &a[i]);

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

        for (int j = 1; j < a[i]; j++)
        {
            if (a[i] % j == 0)
                cnt++;
        }

        if (cnt == 1)
            b[i] = a[i];
    }

    for (int i = 0; i < n; i++)
        printf("%d ", b[i]);

    return 0;
}

2022-09-20 19:19

If you have any answers or tips

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