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#include <stdio.h>
long fact(long n) {
if (n == 0) {
return 1;
}
else return(n*fact(n-1));
}
int main() {
printf("enter a POSITIVE integer... ");
long input;
scanf("%d", &input);
long output = fact(input);
printf("output: %lld\n", output);
return 0;
}
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