Little Endian to Big Endian

Code

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

typedef union {
    uint32_t word;
    uint8_t bytes[4];
} word_t;

uint32_t convert_endian(uint32_t value) {
    word_t word;
    word.word = value;
    uint8_t temp;
    int i;
    for(i = 0; i < 2; i++){
        temp = word.bytes[i];
        word.bytes[i] = word.bytes[3 - i];
        word.bytes[3 - i] = temp;
    }
    return word.word;
}

int main() {
    uint32_t val;
    scanf("%u", &val);
    printf("%u", convert_endian(val));
    return 0;
}

Solving Approach