Sheet 2 (Functions) - Q1
itsLu
c_cpp
a year ago
864 B
8
Indexable
/* A. Write a function to calculate factorial of any number, then write a program to calculate a! + b! - c! using: • Loop */ /* 5! = 5x4x3x2x1, 3! = 3x2x1 2! = 2x1, 0! - 1! = 1, n<0 = no factorial*/ #include <iostream> using namespace std; int loop_factorial (int n) { int fact = 1; //n = 3 for (int k = n ; k >= 1 ; k--) { fact *= k; //or fact = fact * k; } if (n == 0) return 1; else return fact; } //• Recursion (without loops) int rec_factorial (int n) { if (n == 0 || n == 1) return 1; else return n * rec_factorial(n-1); } int main() { int a, b, c, res; cout << "Please enter a, b and c: " << endl; cin >> a >> b >> c; res = rec_factorial(a) + rec_factorial (b) - rec_factorial(c); cout << "Result = " << res; }
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