Little Endian to Big Endian

Code

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

uint32_t convert_endian(uint32_t value) {
    int res = 0;
    
    //res |= (value >> 8*0 & 0xFF) << 8*3;
    //res |= (value >> 8*1 & 0xFF) << 8*2;
    //res |= (value >> 8*2 & 0xFF) << 8*1;
    //res |= (value >> 8*3 & 0xFF) << 8*0;

    for (int i=0; i<sizeof(value); i++) {
        res |= (value >> 8*i & 0xFF) << 8*(3-i);
    }


    return res;
}

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

Solving Approach