1-5.4Word Counting (1-11 ,1-12)

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本文介绍了一个简单的C语言程序，该程序能够逐行打印输入的一句话中的每个单词，并讨论了如何对该程序进行测试以发现潜在的错误。通过使用状态标记来跟踪字符是否属于单词的一部分，程序能够正确地处理各种输入情况。

1-11

Ques:How do you test the word count program? What kinds of input are most likely to uncover bugs if there are any?

Ans:I use a state "IN" or "OUT" to represent the char receiving now is in a word or not, a count for counting words,and a flag stores last char, when last char tested IN ,and next is OUT then the count adds once. there will be too much bugs such as ignoring the null at the beginning or something else.

1-12

Ques:Write a program that prints its input one word per line

Ans:

#include <stdio.h> #define IN 1 #define OUT 0 int test(int c) { int state; if(c==' '||c=='/t'||c=='/n') state=OUT; else state=IN; return state; } int main() { int state=OUT; int c,lastc; lastc=0; while(c=getchar()!=EOF) { if(test(c)) { putchar(c); lastc=c; } else { if(lastc=='/n') { putchar('/n'); lastc='/n'; } } } return 0; }