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# factfind - else If the integer is less than zero entry is...

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// factfind.cpp // A program that calculates the factorial of an integer recursively. / #include<iostream.h> // necessary for stream I/O # // function prototype long factorial(long n); l int main() { long n; // number entered by user long result; // result returned by factorial function cout << "Enter a non-negative integer: "; cin >> n; if(n == 0) // If the integer is 0, print message and do no calculation. { cout << "By definition, the factorial of 0 is 1.\n"; } else { if(n > 0) // If the integer is greater than zero, calculate { // the factorial. result = factorial(n); // Call the recursive function. cout << "The factorial of " << n << " is " << result << ".\n";
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Unformatted text preview: } else // If the integer is less than zero, entry is not valid. { cout << "Not a valid integer.\n"; } } return 0; } // Recursive function that calculates factorial. long factorial(long n) { long fact; // Local variable returned by function. if(n > 1) { // If n is not one, make another recursive call. fact = n * factorial(n - 1); } else { // Exit condition fact = 1; // If n is one, recursion stops and flow of logic } // begins "backing out" of recursive calls. return(fact); // Return fact to the next level of recursion. }...
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