Modify Bytes in a 32-bit Value Using Union

Code

#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;
    reg.bytes[1] = b1;
    reg.bytes[2] = b2;

    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;
}

Solving Approach

Plan:
- create a local variable using union
- update the value with input
- update the bytes[1] and bytes[2] with b1 & b2 respectively
- reconstruct the new value
- print the new value