Program to print product of digit using while loop in C-language

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

OUTPUT
Enter the number
456
Sum of digit=15

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