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Answered 2010-01-15 19:15:04
// Iterative solution
unsigned long iterativeFactorial(const unsigned long n) {
unsigned long i, factorial = 1;
for(i = 1; i <= n; i++) {
factorial *= i;
}
return factorial;
}
// Recursive solution
unsigned long recursiveFactorial(const unsigned long n) {
if(n <= 1) {
return n;
}
return n * recursiveFactorial(n - 1);
}
// Sample calls
int main() {
unsigned long n;
printf("Enter a number to find its factorial: ");
scanf("%u",&n);
printf("Iterative factorial: %u\n", iterativeFactorial(n));
printf("Recursive factorial: %u\n", recursiveFactorial(n));
return 0;
}
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