check byte flag

#include <stdio.h>
#include <stdlib.h>

unsigned char ucA = 0b10101100;

const char* checkFlagCharV1(unsigned char ucVal, unsigned char ucPos)
{

    if(ucPos>7) return "error: pos out of range. (0-7)";

    unsigned char ucB = 1u << ucPos;

    if(ucVal & ucB) return "true ";
    else return "false ";

}

const char* checkFlagCharV2(unsigned char ucVal, unsigned char ucPos)
{

    if(ucPos<1||ucPos>8) return "error: pos out of range. (1-8)";

    unsigned char ucB = 1u << (ucPos - 1);

    if(ucVal & ucB) return "true ";
    else return "false ";

}

int main (int argc, char **argv){

    int bit_pos = 8;

    while(bit_pos--)
    {

        unsigned char ucB = 1u << bit_pos;

        printf("%s", ucA & ucB ? "true " : "false ");

    }

    printf("\n");

    for(bit_pos = 0; bit_pos < 8; bit_pos++)
    {

        unsigned char ucB = 1u << bit_pos;

        printf("%s", ucA & ucB ? "true " : "false ");

    }

    printf("\n");

    printf("%s",checkFlagCharV1(ucA,0));
    printf("%s",checkFlagCharV1(ucA,1));
    printf("%s",checkFlagCharV1(ucA,2));
    printf("%s",checkFlagCharV1(ucA,3));
    printf("%s",checkFlagCharV1(ucA,4));
    printf("%s",checkFlagCharV1(ucA,5));
    printf("%s",checkFlagCharV1(ucA,6));
    printf("%s",checkFlagCharV1(ucA,7));

    printf("\n");

    printf("%s",checkFlagCharV2(ucA,1));
    printf("%s",checkFlagCharV2(ucA,2));
    printf("%s",checkFlagCharV2(ucA,3));
    printf("%s",checkFlagCharV2(ucA,4));
    printf("%s",checkFlagCharV2(ucA,5));
    printf("%s",checkFlagCharV2(ucA,6));
    printf("%s",checkFlagCharV2(ucA,7));
    printf("%s",checkFlagCharV2(ucA,8));

    printf("\n");

    printf("%s\n",checkFlagCharV1(ucA,-1));
    printf("%s\n",checkFlagCharV1(ucA,8));

    printf("%s\n",checkFlagCharV2(ucA,-1));
    printf("%s\n",checkFlagCharV2(ucA,10));

return 0;
}

/*
output:

true false true false true true false false
false false true true false true false true
false false true true false true false true
false false true true false true false true
error: pos out of range. (0-7)
error: pos out of range. (0-7)
error: pos out of range. (1-8)
error: pos out of range. (1-8)


*/