check_factorial.cpp File Reference

A simple program to check if the given number is a factorial of some number or not. More...

#include <cassert>
#include <iostream>

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Functions
bool	is_factorial (uint64_t n)
void	tests ()
int	main ()

Detailed Description

A simple program to check if the given number is a factorial of some number or not.

Author

Divyajyoti Ukirde

Function Documentation

is_factorial()

bool is_factorial

(

uint64_t

n

)

Function to check if the given number is factorial of some number or not.

Parameters

n	number to be checked.

Returns

if number is a factorial, returns true, else false.

                              {
    if (n <= 0) {
        return false;
    }
    for (uint32_t i = 1;; i++) {
        if (n % i != 0) {
            break;
        }
        n = n / i;
    }
    if (n == 1) {
        return true;
    } else {
        return false;
    }
}

main()

int main

(

void

)

Main function

Returns

0 on exit

           {
    tests();
    return 0;
}

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tests()

void tests

(

)

Test function

Returns

void

             {
    std::cout << "Test 1:\t n=50\n";
    assert(is_factorial(50) == false);
    std::cout << "passed\n";
 
    std::cout << "Test 2:\t n=720\n";
    assert(is_factorial(720) == true);
    std::cout << "passed\n";
 
    std::cout << "Test 3:\t n=0\n";
    assert(is_factorial(0) == false);
    std::cout << "passed\n";
 
    std::cout << "Test 4:\t n=479001600\n";
    assert(is_factorial(479001600) == true);
    std::cout << "passed\n";
 
    std::cout << "Test 5:\t n=-24\n";
    assert(is_factorial(-24) == false);
    std::cout << "passed\n";
}

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