Difference between & and && in C?

Question

What is the difference between & and && in C?

My teacher gave me this example:

int a = 8;
int b = 4;
printf(\"a         


        

Answer 1

The & operator performs a bit-wise and operation on its integer operands, producing an integer result. Thus (8 & 4) is (0b00001000 bitand 0b00000100) (using a binary notation that does not exist in standard C, for clarity), which results in 0b00000000 or 0.

The && operator performs a logical and operation on its boolean operands, producing a boolean result. Thus (8 && 4) is equivalent to ((8 != 0) and (4 != 0)), or (true and true), which results in true.