sol.c File Reference

Problem 5 solution More...

#include <stdio.h>

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Functions
unsigned long	gcd (unsigned long a, unsigned long b)
unsigned long	lcm (unsigned long a, unsigned long b)
int	main (void)

Detailed Description

Problem 5 solution

Function Documentation

gcd()

unsigned long gcd	(	unsigned long	a,
		unsigned long	b
	)

Compute Greatest Common Divisor (GCD) of two numbers using Euclids algorithm

{
    unsigned long r;
    if (a > b)
    {
        unsigned long t = a;
        a = b;
        b = t;
    }
    while ((r = (a % b)))
    {
        a = b;
        b = r;
    }
    return b;
}

lcm()

unsigned long lcm	(	unsigned long	a,
		unsigned long	b
	)

Compute Least Common Multiple (LCM) of two numbers

{
    unsigned long long p = (unsigned long long)a * b;
    return p / gcd(a, b);
}

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main()

int main

(

void

)

Main function

{
    unsigned long ans = 1;
    unsigned long i;
    for (i = 1; i <= 20; i++)
    {
        ans = lcm(ans, i);
    }
    printf("%lu\n", ans);
    return 0;
}

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