C Manipulate Bits Within a Bit String

I am currently working on a problem where I am trying to manipulate bits within a bit string.

I am trying to take a signal mask given as:

00101001

and check it against a signal mask given as an integer using the AND and OR operators.

I have some code currently that takes an unsigned character and prints out its binary representation, however I'm not sure how to continue.

main() {
    int signal = 2;
    char a = 41;

    int i;
    for (i = 0; i < 8; i++) {
        printf("%d \n", !!((a << i) & 0x80));
    }
    printf("\n");

    return 0;
}

• The purpose of the program is supposed to take the signal number given, set all bits equal to 0 except the number bit that is the signal number and use an AND operator to find out if the signal is set or not based on whether the value is 0 or 1.

Can anybody help me out with this problem?