Shifts

#include <stdio.h>

int main(void) {
    unsigned x = 1;
    printf("1 << 3 = %u\n", x << 3);
    return 0;
}

#include <stdio.h>

int main(void) {
    printf("5 << 1 = %u\n", 5u << 1);
    printf("3 << 4 = %u\n", 3u << 4);
    return 0;
}

#include <stdio.h>

int main(void) {
    printf("20 >> 2 = %u\n", 20u >> 2);
    printf("7 >> 1 = %u\n", 7u >> 1);
    return 0;
}

#include <stdio.h>

int main(void) {
    for (int n = 0; n < 6; n++) {
        printf("2^%d = %u\n", n, 1u << n);
    }
    return 0;
}

#include <stdio.h>

void print_bits(unsigned char v) {
    for (int i = 7; i >= 0; i--) putchar((v >> i) & 1 ? '1' : '0');
    putchar('\n');
}

int main(void) {
    unsigned char v = 0b00000110;
    print_bits(v);
    print_bits(v << 2);
    return 0;
}

#include <stdio.h>

int main(void) {
    unsigned v = 0b10110;
    for (int i = 0; i < 5; i++) {
        printf("bit %d = %u\n", i, (v >> i) & 1);
    }
    return 0;
}

#include <stdio.h>

int main(void) {
    unsigned v = 0;
    v |= (1u << 0);
    v |= (1u << 2);
    v |= (1u << 4);
    printf("v = %u\n", v);
    return 0;
}

#include <stdio.h>

int main(void) {
    int s = -8;
    printf("-8 >> 1 = %d (implementation-defined)\n", s >> 1);
    unsigned u = 8;
    printf("8u >> 1 = %u\n", u >> 1);
    return 0;
}

#include <stdio.h>
#include <limits.h>

int main(void) {
    printf("unsigned has %zu bits\n", sizeof(unsigned) * CHAR_BIT);
    printf("Safe shift 1u << 31 = %u\n", 1u << 31);
    return 0;
}

#include <stdio.h>

int main(void) {
    unsigned v = 0b11010110;
    unsigned field = (v >> 2) & 0b1111;
    printf("field = %u\n", field);
    return 0;
}

#include <stdio.h>

int main(void) {
    unsigned x = 7;
    unsigned times10 = (x << 3) + (x << 1);
    printf("7 * 10 = %u\n", times10);
    return 0;
}