signed vs unsigned in C

variables.c

#include <stdio.h>

/**
 * main - Entry point
 *
 * Return: Always (0)
 */
int main(void)
{
        unsigned int num_one = 3;
        signed int num_two = -40;
        signed int num_three = 5;

        printf("Here is an unsigned number -> %u\n", num_one);
        printf("Here is a signed negative number -> %i\n", num_two);
        printf("Here is a signed positive number -> %i\n", num_three);

        return (0);
}