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. #include <stdio.h> #define MAX_LINE 1024 void discardnewline(char s[]) { int i; ; s[i] != '\0'; i++) { if(s[i] ==…
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. /* This is the first program exercise where the spec isn't entirely * clear. The spec says…
The standard library function calloc(n,size) returns a pointer to n objects of size size , with the storage initialized to zero. Write calloc , by calling malloc or by modifying it. /* Exercise 8.6. The standard library function calloc(n, size) retur…
Write a program to copy its input to its output, replacing each string of one or more blanks by a single blank. 编写这样一个程序,实现将输入流复制到输出流,但是要将输入流中多个空格过滤成一个空格. 1.旗帜变量方法 #include <stdio.h> int main(void) { int c; int inspace; //这里用了旗帜变量来过滤多余空格 inspace = ;…
Write a program to compare two files, printing the first line where they differ. Here's Rick's solution: /****************************************************** KnR 7-6 -------- Write a program to compare two files and print the first line where they…
fseek库函数 #include <stdio.h> int fseek(FILE *stream, long int offset, int origin); 返回:成功为0,出错为非0 对流stream相关的文件定位,随后的读写操作将从新位置开始. 对于二进制文件,此位置被定位在由origin开始的offset个字符处.origin的值可能为SEEK_SET(文件开始处).SEEK_CUR(当前位置)或SEEK_END(文件结束处). 对于文本流,offset心须为0,或者是由函数f…
Write a program to remove all trailing blanks and tabs from each line of input, and to delete entirely blank lines. 其实做这道题目有两种思路: 1.后向模式:利用getline()先将输入流中,每一行完全接收,然后从接收的line字符串中末尾,往前扫,直到发现第一个非空格和制表符字符: 2.前向模式:每接收一个字符,都要进行输出.判断. /* K&R2 1-18 p31: Writ…
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. 统计输入中单词的长度,并且绘制相应的直方图.水平的直方图比较容易绘制,垂直的直方图较困难一些. /* This program was the…
How would you test the word count program? What kinds of input are most likely to uncover bugs if there are any? 你会如何测试前面的字符统计程序呢?什么样的测试输入,最能揭示你程序中的bug呢? It sounds like they are really trying to get the programmers to learn how to do a unit test. 这听起…
(昨天网络出现了问题,导致这篇没来得及上传,再次补上,今晚照常上传笔记) 练习1.19编写函数r e v e r s e ( s )将字符串s中的字符顺序颠倒过来.使用该函数编写一个程序,每次颠倒一个输入行中的字符顺序 /*************字符串s中的字符顺序颠倒过**********************/ #include <stdio.h> #include <stdlib.h> #define MAXLENGTH 100//字符串最大值 int getline(c…
问题描述 重新编写函数squeeze(s1,s2),将字符串s1中任何与字符串s2中字符匹配的字符都删除. Write an alternate version of squeeze(s1,s2) that deletes each character in the string s1 that matches any character in the string s2 . 解题思路 这里有两种思路: 第一种就是将s1字符串的字符,一个一个的去和s2的全部字符对比,一旦发现有重复的,比如s1中…
第一章虽然感觉不像是个习题.但是我还是认真去做,去想,仅此而已! 练习 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. #include <stdio.h> int main(int argc, char const *argv[]) { print…
编写函数expand(s1,s2), 将字符串s1中类似于a-z一类的速记符号在字符串s2中扩展为等价的完整列表abc……xyz.该函数可以处理大小写字母和数字,并可以处理a-b-c.a-z0-9与a-z等类似的情况.作为前导和尾随的字符原样复制 #include<stdio.h> #include<ctype.h> #include<string.h> int judge(char a, char b) //判断'-'两端的字符是否符合速记符号扩展的要求 { if(i…
目录索引 清风注解-Swift程序设计语言 Point 1. Swift 风格的"Hello, world" 代码事例: println("Hello, world") 注解: Swift 语言的编码风格类似于 C 或 Objective-C.因此,拥有 C 或 Objective-C 开发经验的人更容易掌握 Swift 语言. 在 Swift 中,没有包含在任何类或函数当中的代码,属于拥有全局作用域的代码. 你不需要为了输入输出或者字符串处理导入一个单独的库.…
C语言是一门通用计算机编程语言,应用广泛.C语言的设计目标是提供一种能以简易的方式编译.处理低级存储器.产生少量的机器码以及不需要任何运行环境支持便能运行的编程语言. C语言中的四种存储类别:auto(自动的).static(静态的).register(寄存器的).extern(外部的) 1.auto(自动的)例:auto int a:定义的整形变量a的存储方式是自动存储的,也就是说动态的分配存储空间和释放存储空间.比如说,在一个调用函数里定义的变量,当我们调用这个函数时,CPU在动态存储区分配…
