Little Endian to Big Endian

Code

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

uint32_t convert_endian(uint32_t value) {
    return (
        (value & 0xFF000000) >> 24 |
        (value & 0x00FF0000) >>  8 |
        (value & 0x0000FF00) <<  8 |
        (value & 0x000000FF) << 24
    );
}

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

Solving Approach