Question

. Logic operations in C++: predict each line's result, given that

    PINB = 0x0B, uint8_t x = 0x33, int8_t y = 0x81

(d) z = x && y;

(e) z = 0;

     while (y < 0) {

         ++y;

         ++z;

     }

(f) z = 10;

     while (x < 0) {

         ++x;

         z += 10;

     }

Answer 1

d) z = x && y;
This line calculates the logical AND of x and y, i.e if both x and y are non-zero than result is 1 otherwise result is 0.

e) z = 0;
     while (y < 0) {
         ++y;
         ++z;
     }
The above code segment increments the values of y and z by 1 until the value of y is less than 0, i.e the while loop terminates when the value of y becomes equal to 0.

f) z = 10;
     while (x < 0) {
++x;
   z += 10;
}
The above code segment increments the value of x by 1 and value of z by 10 until the value of x is less than 0, i.e the while loop terminates when the value of x becomes equal to 0.

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