How Not to Program in C++

Answers 229

Answer 27: The problem is that “1” is an integer. The number “3” is also an

integer. So “1/3” is an integer divide.

Thus, the statement:

12 result = 1/3; // Assign result something

does an integer divide of 1 by 3. Integer divides truncate the fractional

part so the result is 0. The integer “0” is turned into floating-point and

assigned result.

The programmer should have written this as:

12 result = 1.0 / 3.0;// Assign result something

Answer 28: The

scanf

function is extremely tricky to use. In this program the

statement:

22 scanf("%c %d", &oper, &value);

gets a character and a integer. The next time

scanf

is called, it will read

another ...