simple C program learning about binary

#include <stdio.h>

int main()
{
    int number = 0;
    // %d is a base 10 number (Decimal)
    // %c is a character
    // %x is a base 16 number (heXadecimal)

    // -1 is the same as 255 as a character      End Of File
    // 0  \0   null-terminator
    // 7  \a   alarm
    // 8  \b   backspace
    // 9  \t   tab
    // 10 \n   new line (line feed)
    // 13 \r   carriage return

    while(number < 256)
    {
        printf("%d: 0x%x (%c)\n", number, number, number);
        number++;
    }
    // 8 bit binary
    //   0   0   0   0   0   1   0   1      5
    // ___ ___ ___ ___ ___ ___ ___ ___
    // 128  64  32  16   8   4   2   1
    // << left shift
    // >> right shift
    printf("%d\n", 1 << 0); // 1  <-- 2^0
    printf("%d\n", 1 << 1); // 2  <-- 2^1
    printf("%d\n", 1 << 2); // 4  <-- 2^2
    printf("%d\n", 1 << 3); // 8  <-- 2^3
    printf("%d\n", 3 << 1); // 6
    printf("%d\n", 5 << 2); // 20
    printf("%d\n", 5 >> 1); // 2 (1 bit falls off of the register)
    printf("%d\n", 1 << 30); // ~1billion <-- 2^30
    printf("%d\n", 1 << 31); // ~-2billion <-- 2^31 <-- the sign bit
                            // most significant place reserved for negatives
    printf("%d\n", 1 << 32); // 0 <-- moved all the way off of the register
    printf("%d\n", 1 << 33); // 0
    return 0; // signals the main function to stop.
}