notes/education/computer engineering/ECE1400/Chapter 7 Exercises.md

3. Which of the following aren not legal types in C?

a. short unsigned int b. short float c. long double d. unsigned long

Answer: b. short float

4. If c is a variable of type char, which of the following statements is illegal?

char c;
// A:
i += c; // i has type int
// B:
c = 2 * c - 1;
// C:
putchar(c);
// D:
printf(c);

Answer: D is illegal because printf operates on strings, not chars.

6. For each of the following items of data, specify which one of the types char, short, int, or longis the smallest one guaranteed to be large enough to store the item.

Answer: A. Days in a month: char B. Days in a year: short C. Minutes in a day: short D. Seconds in a day: long

10. Suppose that i is a variable of type int, j is a variable of type float, and k is a variable of type unsigned int. What is the type of the expression i + (int) j * k?

Answer: unsigned int

15. Use typedef to create types named Int8, Int16, and Int32. Define the types so that they represent 8 bit, 16 bit, and 32 bit integers on your machine.

Answer:

typedef char Int8;
typedef short Int16;
typedef long Int32;