#include <stdio.h>
int main() {
    int x1, x2; // Define two integers; uses 4 bytes each.
    unsigned y; // Define an unsigned integer; uses 4 bytes.
    char c1, c2; // Define two charater; uses 1 bytes each.
    x1 = 65535;
    x2 = x1 + 5;
    printf("Enter y: ");
    scanf("%u", &y); // Read y from user input
    c1 = 97;
    c2 = 'A';
    c2 = c2 + 32; //Change the value of c2, using c2 itself.
    printf("x1=%d\n", x1);
    printf("x2=%d\n",x2);
    printf("y=%u\n",(y+15)); // Calculate y + 15, and then output it
    printf("c1=%c\n",c1);
    printf("c2=%c\n",c2);
    return 0;
}