一、特点:有限次的重复某个操作。 二、在C语言中,引入 while语句、do- while语句和for语句三种循环结构来处理此类问题

#include maino FILE ip nar str[11]; if(fp= fopen(\e: Mname. txt\,\r\)==NULL)以只读方式打开 name. txt文件* printf\hn无法打开文件 name txt!m\)

*教学成绩管理系统* *说明:《教学成绩管理系统》基本信息包括班级、学号、姓名 及语文、数学、外语、物理、化学五科成绩的信息,可以根据实际情况有所增减* 教学成绩管理系统*

#include #include void main( void char ch, filename[ 40], mode [4] *输入文件名和模式* printf(\hn请输入一个文件名:\

2.1程序设计概述 2.2C语言的数据类型 2.3常量和变量 2.4整型数据 2.5实型数据 2.6字符型数据 2.7各类数值数据之间的混合运算

一、我已经能熟练地操作计算机了,还学什么? 二、计算机能做什么? 三、如何把计算机做为求解问题的工具,为我服务终身?

n contrast to alcohols with their rich chemical reactivity, ethers (compounds contain- ing a C-0-C unit) undergo relatively few chemical reactions. As you saw wher we discussed Grignard reagents in Chapter 14 and lithium aluminum hydride reduc- tions in Chapter 15, this lack of reactivity of ethers makes them valuable as solvents in a number of synthetically important transformatio. In the present chapter you will learn

4.1 There are four C. H, alkyl groups, and so there are four C. H, CI alkyl chlorides. Each may be named by both the functional class and substitutive methods. The functional class name uses the name of the alkyl group followed by the halide as a second word. The substitutive name modifies the name of the corresponding alkane to show the location of the halogen atom

*极限俱乐部会员信息系统* #include \stdio h\ #include \string. h #define Len sizeof (struct staff) /自动求取staf结构的字节长度* struct staft char unit[601 char name[20]

SOLUTIONS TO TEXT PROBLEMS 19.1 (b) The four carbon atoms of crotonic acid form continuous chain. Because there is a double bond between C-2 and C-3, crotonic acid is one of the stereoisomers of 2-butenoic acid. The chem