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- #include <stdio.h>
- int main() {
- int n, i;
- unsigned long long fact = 1;
- printf("Enter an integer: ");
- scanf("%d", &n);
- // shows error if the user enters a negative integer
- if (n < 0)
- printf("Error! Factorial of a negative number doesn't exist.");
- else {
- for (i = 1; i <= n; ++i) {
- fact *= i;
- }
- printf("Factorial of %d = %llu", n, fact);
- }
- return 0;
- }
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