69. Modify Bytes in a 32-bit Value Using Union

#include <stdio.h>
#include <stdint.h>

typedef union {
    uint32_t value;
    uint8_t bytes[4];
} Register;

// Write logic here using union to modify byte[1] and byte[2]
void modify_and_print(uint32_t input, uint8_t b1, uint8_t b2) {
    // Your logic here
    Register reg ;
    reg.value = input;
    uint32_t mask = (uint32_t(b2)) << 16;
    
    mask = mask | ((uint32_t(b1)) << 8);
    // printf("%x\n",mask);
    reg.value = reg.value & (0XFF0000FF);
    // printf("%x\n",reg.value);
    reg.value = reg.value | mask;
    // printf("%x\n",reg.value);
    printf("%u",reg.value);
    
    
}

int main() {
    uint32_t num;
    uint8_t b1, b2;
    scanf("%u %hhu %hhu", &num, &b1, &b2);
    modify_and_print(num, b1, b2);
    return 0;
}