#include<stdio.h> long factorial(int); int main() { int n; long f; printf("Enter an integer to find factorial\n"); scanf("%d", &n); if (n < 0) printf("Negative integers are not allowed.\n"); else { f = factorial(n); printf("%d! = %ld\n", n, f); } return 0; } long factorial(int n) { if (n == 0) return 1; else return(n * factorial(n-1)); }
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