#include<stdio.h>
int fact(int a)
{
if (a == 0 || a==1) return 1;
return a*fact(a - 1);
}
int main()
{
int num,i;
printf("Enter a number: \n");
do {
scanf_s("%d", &num);
} while(printf("%d!: %d\n", num, fact(num)));
getchar();
getchar();
}
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