《C程序设计语言第2版习题答案合集》

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The C Programming Language, authored by Brian W. Kernighan and Dennis M. Ritchie, is a seminal work that has shaped the way programmers think and write code in the C language. The second edition of this book, published by the Mechanical Industry Press, provides a comprehensive guide to C programming concepts and techniques. In order to deepen understanding and reinforce learning, the book offers a series of exercises at the end of each chapter. These exercises cover a wide range of topics, including basic syntax, control structures, arrays, pointers, functions, and more. For readers looking to test their knowledge and practice their skills, the book also includes answers to these exercises in a separate document. The comprehensive nature of the exercises allows readers to apply the knowledge they have gained from the book, reinforcing important concepts and honing their problem-solving abilities. By working through these exercises and checking their answers, readers can not only assess their understanding of C programming but also gain practical experience in writing code. Overall, the exercises provided in "The C Programming Language" offer a valuable opportunity for readers to deepen their understanding of C programming and enhance their skills in this essential language. Through practice and application, readers can become proficient in C programming and leverage their knowledge to tackle real-world programming challenges. With the answers provided alongside the exercises, readers can test their understanding, identify areas for improvement, and enhance their proficiency in C programming.

《C 程序设计语言》英文第 2 版的课后习题与答案

else

{

inspace = 0;

putchar(c);

}

return 0;

}

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.

/* This program was the subject of a thread in comp.lang.c, because of

the way it handled EOF.

* The complaint was that, in the event of a text file's last line not

ending with a newline,

* this program would not count the last word. I objected somewhat to

this complaint, on the

* grounds that "if it hasn't got a newline at the end of each line,

it isn't a text file".

* These grounds turned out to be incorrect. Whether such a file is a

text file turns out to

* be implementation-defined. I'd had a go at checking my facts, and

had - as it turns out -

* checked the wrong facts! (sigh)

* It cost me an extra variable. It turned out that the least

disturbing way to modify the

* program (I always look for the least disturbing way) was to replace

the traditional

* while((c = getchar()) != EOF) with an EOF test actually inside the

loop body. This meant

* adding an extra variable, but is undoubtedly worth the cost,

because it means the program

* can now handle other people's text files as well as my own. As Ben

Pfaff said at the

* time, "Be liberal in what you accept, strict in what you produce".

Sound advice.

* The new version has, of course, been tested, and does now accept

text files not ending in

* newlines.

* I have, of course, regenerated the sample output from this program.

Actually, there's no

* "of course" about it - I nearly forgot.

#include <stdio.h>

#define MAXWORDLEN 10

int main(void)

{

int c;

int inspace = 0;

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《C 程序设计语言》英文第 2 版的课后习题与答案

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《C 程序设计语言》英文第 2 版的课后习题与答案

30 | * * * * * *

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2 | * * * * * * * * * * *

1 | * * * * * * * * * * *

+---------------------------------

1 2 3 4 5 6 7 8 9 10 >10

Exercise 1-14

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

Naturally, I've gone for a vertical orientation to match exercise 13. I had some difficulty

ensuring that the printing of the X-axis didn't involve cheating. I wanted to display each

character if possible, but that would have meant using isprint(), which we haven't yet met. So I

decided to display the value of the character instead. (The results below show the output on

an ASCII system - naturally, a run on an EBCDIC machine would give different numbers.) I had

to jump through a few hoops to avoid using the % operator which, again, we haven't yet met

at this point in the text.

#include <stdio.h>

/* NUM_CHARS should really be CHAR_MAX but K&R haven't covered that at

this stage in the book */

#define NUM_CHARS 256

int main(void)

{

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