Program to print maximum digit of a number using while loop in C-language

-
#include<stdio.h>
int main()
{
    int a,n,max=0;
    printf("Enter the number\n");
    scanf("%d",&n);
    while(n!=0)
    {
        a=n%10;
        n=n/10;
        if(max<a)
        {
            max=a;
        }
    }
    printf("Greatest digit=%d",max);
   
}

OUTPUT
Enter the number
89058
Greatest digit=9

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