Bit Reversal in an 8-bit Value

Code

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

uint8_t reverse_bits(uint8_t val) {
    int i;
    uint8_t ex ;
    uint8_t ans;
    for(i=0;i<8;i++){
       ans = ans<<1 ;
      ex = val & (0x01<<i);
      if(ex)ans |= 0x01;
     
      //printf("%d\n",ans);
    }
    return ans;
   
}

int main() {
    uint8_t val;
    scanf("%hhu", &val);

    uint8_t result = reverse_bits(val);
    printf("%u", result);
    return 0;
}

Solving Approach