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1 - A Tutorial Introduction

Exercise 1-1​

Run the "hello, world" program on your system. Experiment with leaving out parts of the program, to see what error messages you get. [1]

My solution​

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Official solution​

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Exercise 1-2​

Experiment to find out what happens when printf's argument string contains \c, where c is some character not listed above. [1]

My solution​

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Official solution​

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Exercise 1-3​

Modify the temperature conversion program to print a heading above the table. [1]

My solution​

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Official solution​

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Exercise 1-4​

Write a program to print the corresponding Celsius to Fahrenheit table. [1]

My solution​

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Official solution​

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Exercise 1-5​

Modify the temperature conversion program to print the table in reverse order, that is, from 300 degrees to 0. [1]

My solution​

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Official solution​

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Exercise 1-6​

Verify that the expression getchar() != EOF is 0 or 1. [1]

My solution​

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Official solution​

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Exercise 1-7​

Write a program to print the value of EOF. [1]

My solution​

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Official solution​

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Exercise 1-8​

Write a program to count blanks, tabs, and newlines. [1]

My solution​

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Official solution​

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Exercise 1-9​

Write a program to copy its input to its output, replacing each string of one or more blanks by a single blank. [1]

My solution​

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Official solution​

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Exercise 1-10​

Write a program to copy its input to its output, replacing each tab by \t, each backspace by \b, and each backslash by \\. This makes tabs and backspaces visible in an unambiguous way. [1]

My solution​

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Official solution​

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Exercise 1-11​

How would you test the word count program? What kinds of input are most likely to uncover bugs if there are any? [1]

My solution​

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Official solution​

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Exercise 1-12​

Write a program that prints its input one word per line. [1]

My solution​

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Official solution​

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Exercise 1-13​

Write a program to print a histogram of the lengths of words in its input. It is easy to draw the histogram with the bars horizontal; a vertical orientation is more challenging. [1]

My solution​

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Official solution​

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Exercise 1-14​

Write a program to print a histogram of the frequencies of different characters in its input. [1]

My solution​

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Official solution​

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Exercise 1-15​

Rewrite the temperature conversion program of Section 1.2 to use a function for conversion. [1]

My solution​

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Official solution​

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Exercise 1-16​

Revise the main routine of the longest-line program so it will correctly print the length of arbitrarily long input lines, and as much as possible of the text. [1]

My solution​

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Official solution​

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Exercise 1-17​

Write a program to print all input lines that are longer than 80 characters. [1]

My solution​

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Official solution​

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Exercise 1-18​

Write a program to remove trailing blanks and tabs from each line of input, and to delete entirely blank lines. [1]

My solution​

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Official solution​

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Exercise 1-19​

Write a function reverse(s) that reverses the character string s. Use it to write a program that reverses its input a line at a time. [1]

My solution​

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Official solution​

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Exercise 1-20​

Write a program detab that replaces tabs in the input with the proper number of blanks to space to the next tab stop. Assume a fixed set of tab stops, say every nn columns. Should nn be a variable or a symbolic parameter? [1]

My solution​

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Official solution​

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Exercise 1-21​

Write a program entab that replaces strings of blanks by the minimum number of tabs and blanks to achieve the same spacing. Use the same tab stops as for detab. When either a tab or a single blank would suffice to reach a tab stop, which should be given preference? [1]

My solution​

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Official solution​

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Exercise 1-22​

Write a program to "fold" long input lines into two or more shorter lines after the last non-blank character that occurs before the nnth column of input. Make sure your program does something intelligent with very long lines, and if there are no blanks or tabs before the specified column. [1]

My solution​

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Official solution​

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Exercise 1-23​

Write a program to remove all comments from a C program. Don't forget to handle quoted strings and character constants properly. C comments do not nest. [1]

My solution​

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Official solution​

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Exercise 1-24​

Write a program to check a C program for rudimentary syntax errors like unbalanced parentheses, brackets and braces. Don't forget about quotes, both single and double, escape sequences, and comments. (This program is hard if you do it in full generality.) [1]

My solution​

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Official solution​

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