一旦我运行我的代码，就会出现分段错误。 arrays 似乎有问题

Question

I wrote code which prompts the user for a number, then tell which digits are of that number are repeated.
While there is no problem with compilation, it shows segmentation fault(core dumped) when i run it.

Code:

 #include <stdio.h>

 int main(void)
 {
    int n=0;
    int digit[n];
    int t;
    
    for (int num = 0;num<10;num++)
    {
        digit[num] = 0;
    }
    
    scanf("%d",&t);
    int y=t;
    int c = 0;
    
    do
    {
        c++;
        y = y/10;
    }while(y>0);
    
    int ko;
    
    for (int no=0;no<c;no++)
    {
        ko = t%10;
        digit[ko]++;
        t=t/10;
    }
    
    int count = 0;
    
    for (int co = 0;co<10;co++)
    {
        if (count>0)
            printf(" ");
    
        if (digit[co]>1)
        {
            printf("%d",co);
            count ++;
        }
    }
 }

Answer 1

The problem lies here:

int n=0;
int digit[n];

This makes digit an array of 0 int s, which is not what you need. Looking at

for (int num = 0;num<10;num++)
{
    digit[num] = 0;
}

This makes me think that you need to iterate over 10 array elements. So make it,

int digit[10];

Or even better define a macro and use it elsewhere.

#define LIMIT_ARRAY_ELEMENTS (10)

and then

int digit[LIMIT_ARRAY_ELEMENTS];

and

for (int num = 0; num < LIMIT_ARRAY_ELEMENTS; num++)

The segmentation fault you see is because you have not allocated enough memory for what you are trying to do.