collatz.c File Reference

Implementation of Collatz' conjecture More...

#include <stdio.h>
#include <stdlib.h>

Include dependency graph for collatz.c:

Functions
int	main (int argc, char *argv[])

Detailed Description

Implementation of Collatz' conjecture

Collatz conjecture: a series for a number \(n\) in which if \(n\) even then the next number is \(\frac{n}{2}\) ,but if n is odd then the next number is \(3n+1\). This series continues till \(n\) reaches 1

Function Documentation

main()

int main	(	int	argc,
		char *	argv[]
	)

Main function

{
    unsigned long long n, curr_no, num_steps = 0;
    if (argc == 2)
        n = strtoull(argv[1], NULL, 10);
    else
    {
        printf("Enter starting number: ");
        scanf("%lu", &n);  // input number
    }
 
    curr_no = n;          // curr_no stores input number n
    while (curr_no != 1)  // loop till series reaches 1
    {
        num_steps++;
        printf("%llu->", curr_no);
        if (curr_no % 2 == 0)  // condition   for even number
            curr_no = curr_no / 2;
        else
            curr_no = (curr_no * 3) + 1;  // condition for odd number
    }
    printf("1\nNumber of steps: %llu\n", num_steps);
    return 0;
}