#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; reg.value = input; // Modify byte 1 and 2 (little endian: bytes[1] and bytes[2]) 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; }
This problem demonstrates byte-level mutation of a 32-bit register using union. This is common in hardware register configuration where only certain bytes need to be changed (e.g., setting baud rate, command fields).
Solution Logic:
Test Cases
Test Results
Input
305419896 170 187
Expected Output
314288760