C++ code-- Factorial Recursion
Write code to complete PrintFactorial()'s recursive case. Sample output if userVal is 5:
5! = 5 * 4 * 3 * 2 * 1 = 120
#include
using namespace std;

void PrintFactorial(int factCounter, int factValue){
int nextCounter = 0;
int nextValue = 0;

if (factCounter == 0) { // Base case: 0! = 1
cout << "1" << endl;
}
else if (factCounter == 1) { // Base case: Print 1 and result
cout << factCounter << " = " << factValue << endl;
}
else { // Recursive case
cout << factCounter << " * ";
nextCounter = factCounter - 1;
nextValue = nextCounter * factValue;


}
}

int main() {
int userVal = 0;

userVal = 5;
cout << userVal << "! = ";
PrintFactorial(userVal, userVal);

return 0;
}

Answer:

void PrintFactorial(int factCounter, int factValue){

int nextCounter = 0;

int nextValue = 0;

if (factCounter == 0) { // Base case: 0! = 1

cout << "1" << endl;

}

else if (factCounter == 1) { // Base case: Print 1 and result

cout << factCounter << " = " << factValue << endl;

}

else { // Recursive case

cout << factCounter << " * ";

nextCounter = factCounter - 1;

nextValue = nextCounter * factValue;

printFactorial(nextCounter, nextValue);

}

}

Explanation:

The only things that is left is calling the recursive function in the else statement. It is the bolded command on the answer.

factCounter is the value we are multiplying. In the function, it is nextCounter. So for 5, it is 5, then 4, then 3, until 0...

factValue is the value of the factorial. In the function, it is nextValue So it is 5, then 5*4 = 20, then 5*4*3 = 60, then...

void PrintFactorial(int factCounter, int factValue){

int nextCounter = 0;

int nextValue = 0;

if (factCounter == 0) { // Base case: 0! = 1

cout << "1" << endl;

}

else if (factCounter == 1) { // Base case: Print 1 and result

cout << factCounter << " = " << factValue << endl;

}

else { // Recursive case

cout << factCounter << " * ";

nextCounter = factCounter - 1;

nextValue = nextCounter * factValue;

printFactorial(nextCounter, nextValue);

}

}

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