#Use & to check whether a bit is set
#include <stdio.h>
int main(void){                                                 //X 
    unsigned int x = 5;        //00000000 00000000 00000000 00000101
    unsigned int mask = 2;     //00000000 00000000 00000000 00000010
                               //-------------------------------------
                               //00000000 00000000 00000000 00000000              
   
    unsigned int result = x & mask;
    if(result != 0){            
        printf("Bit is set\n");     //bit set: bit is equal to 1
    } else {
        printf("Bit is not set\n"); //bit is equal to 0
    }    
                          //MSB                               LSB
    unsigned int y = 7;   //00000000 00000000 00000000 00000111
                          //00000000 00000000 00000000 00000010
                          //00000000 00000000 00000000 00000010 
    result = y & mask;
    if(result != 0){
        printf("Bit is set\n");
    } else {
        printf("Bit is not set\n");
    }    

    return 0;
}

/*
0 & 0 = 0
0 & 1 = 0
1 & 0 = 0
1 & 1 = 1

*/