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;

void modify_and_print(uint32_t input, uint8_t b1, uint8_t b2) {
    Register reg = {
        .value = input
    };

    // Modify bytes content
    reg.bytes[1] = b1;
    reg.bytes[2] = b2;

    // Print the input
    printf("%u\n", 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;
}