Exercise 1-7. Write a program to print the value of EOF. This is one of those exercises that looks trivial — one printf and you’re done — but it opens the door to one of the most important design decisions in the C standard library. Before you can really understand why Chapter 1’s input loops …
Exercise 1-6. Verify that the expression getchar() != EOF is 0 or 1. What This Exercise Is Really About This is not a “write a loop” exercise — it is a verification exercise, and the thing being verified is a fundamental rule of C that surprises many beginners: every relational expression in C evaluates to …
Exercise 1-5. Modify the temperature conversion program to print the table in reverse order, that is, from 300 degrees to 0. Approach The original K&R temperature program counts up: it starts fahr at 0, adds the step each iteration, and stops when fahr > 300. Reversing the table means changing exactly three things: (1) start …
Exercise 1-3. Modify the temperature conversion program to print a heading above the table. What the Base Program Does K&R Section 1.2 introduces a program that prints a Fahrenheit-to-Celsius conversion table from 0 to 300 in steps of 20. It uses integer arithmetic — celsius = 5 * (fahr – 32) / 9 — and …
Exercise 1-4. Write a program to print the corresponding Celsius to Fahrenheit table. Approach K&R Chapter 1 opens with a Fahrenheit-to-Celsius table, converting F values to Celsius using C = 5 × (F − 32) / 9. This exercise asks for the inverse: step through Celsius values (0, 20, 40, …, 300) and compute the …
Exercise 1-2. Experiment to find out what happens when printf‘s argument string contains \c, where c is some character not listed above. The escape sequences K&R lists in section 1.5 are: \n (newline), \t (tab), \b (backspace), \” (double quote), and \\ (backslash). The exercise asks what happens with everything else. Approach The key insight …