Collatz conjecture

syracuse.c

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


unsigned int syracuse(unsigned int n)
{
        if(n%2 == 0)
                return n/2;
        else
                return 3*n + 1;
}

int main(int argc, char* argv[])
{
        unsigned int number = 1;
        
        if(argc != 2){
                fputs("Usage : ./syracuse number\n", stderr);
                return EXIT_FAILURE;
        }


        sscanf(argv[1], "%d$", &number); 

        while(number > 1){
                printf("%d->", number);
                number = syracuse(number);
        }

        printf("%d\n", number);

        return EXIT_SUCCESS;
}