文件读取和输入的小问题，指针数组的初始化

qq_30446977 2015-09-21 02:07:49
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<string.h>

#define LENGTH 81
int mai (void)
{
char *yanyu[]=
{
"san ren cheng hu.\n",
"xin xiang shi cheng.\n",
"ke zhou qiu jian.\n"};

char more[LENGTH];
FILE *pfile=NULL;
char* filename="yan yu ji ze";

pfile=fopen(filename,"w");
if(!pfile)
{
printf("\n da kai wen jian chu cuo!");
exit(1);
}

setvbuf(pfile,NULL,_IOFBF,LENGTH);

for(int i=0;i<sizeof(yanyu)/sizeof(yanyu[0]);++i)
if(EOF==fputs(yanyu[i],pfile))
{
printf("du ru shi bai!");
exit(1);
}

fclose(pfile);
pfile=NULL;

pfile=fopen(filename,"a");
if(!pfile)
{
printf("zeng jia wen jian neirong chucuo!");
exit(1);
}
setvbuf(pfile,NULL,_IOFBF,LENGTH);

while(1)
{
fgets(more,LENGTH,stdin);
if(more[0]=='\n')
break;

if(EOF==(fputs(more,pfile)))
{
printf("\n zeng jia wenjian neirong shibai.");
exit(1);
}

}

fclose(pfile);
pfile=NULL;

pfile=fopen(filename,"r");
if(!pfile)
{
printf("da kai wen jian shibai!");
exit(1);
}

setvbuf(pfile,NULL,_IOFBF,LENGTH);

printf("zhe xie yan yu shi:\n");
while(fgets(more,LENGTH,pfile))
printf("%s",more);

fclose(pfile);

remove(filename);
pfile=NULL;
return 0;
}
刚学到从文件读写字符串。但是遇到个的问题。
指针数组的初始化
char *yanyu[]=
{
"san ren cheng hu.\n",
"xin xiang shi cheng.\n",
"ke zhou qiu jian.\n"};
编译不过去。但是我删掉 char more[LENGTH];就能编译通过是为什么呢。
我在网上找了好多资料，别人这样初始化都是可以的啊！下面就是我找到的一个例子。为什么我的一加char more[LENGTH];就编译不过去呢。
char *month_name(int n)
{
static char *name[]={
"Illegal month",
"January","February","March",
"April","May","June",
"July","August","September",
"October","November","December"
};
return (n<1||n>12)?name[0]:name[n];
}
其中，name的声明与排序例子中lineptr的声明相同，是一个一维数组，数组的元素为字符指针。name数组的初始化通过一个字符串列表实现，列表中的每个字符串赋值给数组相应位置的元素。第i个字符串的所有字符存储在存储器中的某个位置，指向它的指针存储在name[i]中。由于上述声明中没有指明数组name的长度，因此，编译器编译时将对初值个数进行统计，并将这一准确数字填入数组的长度。
...全文
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我用双手-成就你的梦想 2015-09-21
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我用 gcc 可以编译过去，没问题
赵4老师 2015-09-21
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int mai (void)→int main(void) 偶遇到类似问题都是用 “每次用/*...*/注释掉不同部分再重新编译，直到定位到具体语法出错的位置。” 的方法解决的。 关于自己是否适合编程的很简单的测试： 在报纸或杂志上随便找一段约1000字的文章，在Word中输入一遍。输完后再参考下面答案： A里面有10处以上文字或标点错误 B里面没有文字或标点错误并敢为此跟人打赌 C里面没有文字或标点错误并且字体和排版完全与原稿一致 D打印在半透明的纸上和原稿重叠在一起检查一模一样，且自我感觉很有成就感 A不适合编程（理由：打字准确度偏低、粗心大意） B初级程序员（理由：打字准确度很高、认真细致、自信、理解全角半角概念） C高级程序员（理由：在B的基础上理解字体和排版也是电脑打印的重要因素、但相比D还不够偏执、精益求精、结果可验证） D软件项目经理（理由：能针对项目给出令人信服的细致到极点的需求说明和典型测试用例。用户几乎挑不出毛病。专业！） 如果想从A变成B的话，到我的资源http://download.csdn.net/detail/zhao4zhong1/4084259里面下载“适合程序员的键盘练习”
C语言精彩编程100例
C语言入门教程：主要针对C语言初学者，从零讲解各个细节。
The C Programming Language 第二版 英文版
The C programming Language 第二版英文版 內容列表 Table of Contents Preface.......................................................... Preface to the first edition..................................... Introduction..................................................... Chapter 1 - A Tutorial Introduction.............................. 1.1 Getting Started................................ 1.2 Variables and Arithmetic Expressions........... 1.3 The for statement.............................. 1.4 Symbolic Constants............................. 1.5 Character Input and Output..................... 1.5.1 File Copying.......................... 1.5.2 Character Counting.................... 1.5.3 Line Counting......................... 1.5.4 Word Counting......................... 1.6 Arrays......................................... 1.7 Functions...................................... 1.8 Arguments - Call by Value...................... 1.9 Character Arrays............................... 1.10 External Variables and Scope.................. Chapter 2 - Types, Operators and Expressions..................... 2.1 Variable Names................................. 2.2 Data Types and Sizes........................... 2.3 Constants...................................... 2.4 Declarations................................... 2.5 Arithmetic Operators........................... 2.6 Relational and Logical Operators............... 2.7 Type Conversions............................... 2.8 Increment and Decrement Operators.............. 2.9 Bitwise Operators.............................. 2.10 Assignment Operators and Expressions.......... 2.11 Conditional Expressions....................... 2.12 Precedence and Order of Evaluation............ Chapter 3 - Control Flow......................................... 3.1 Statements and Blocks.......................... 3.2 If-Else........................................ 3.3 Else-If........................................ 3.4 Switch......................................... 3.5 Loops - While and For.......................... 3.6 Loops - Do-While............................... 3.7 Break and Continue............................. 3.8 Goto and labels................................ Chapter 4 - Functions and Program Structure...................... 4.1 Basics of Functions............................ 4.2 Functions Returning Non-integers............... 4.3 External Variables............................. 4.4 Scope Rules.................................... 4.5 Header Files................................... 4.6 Static Variables................................ 4.7 Register Variables.............................. 4.8 Block Structure................................. 4.9 Initialization.................................. 4.10 Recursion...................................... 4.11 The C Preprocessor............................. 4.11.1 File Inclusion........................ 4.11.2 Macro Substitution.................... 4.11.3 Conditional Inclusion................. Chapter 5 - Pointers and Arrays.................................. 5.1 Pointers and Addresses......................... 5.2 Pointers and Function Arguments................ 5.3 Pointers and Arrays............................ 5.4 Address Arithmetic............................. 5.5 Character Pointers and Functions............... 5.6 Pointer Arrays; Pointers to Pointers........... 5.7 Multi-dimensional Arrays....................... 5.8 Initialization of Pointer Arrays............... 5.9 Pointers vs. Multi-dimensional Arrays.......... 5.10 Command-line Arguments........................ 5.11 Pointers to Functions......................... 5.12 Complicated Declarations...................... Chapter 6 - Structures........................................... 6.1 Basics of Structures........................... 6.2 Structures and Functions....................... 6.3 Arrays of Structures........................... 6.4 Pointers to Structures......................... 6.5 Self-referential Structures.................... 6.6 Table Lookup................................... 6.7 Typedef........................................ 6.8 Unions......................................... 6.9 Bit-fields..................................... Chapter 7 - Input and Output..................................... 7.1 Standard Input and Output....................... 7.2 Formatted Output - printf....................... 7.3 Variable-length Argument Lists.................. 7.4 Formatted Input - Scanf......................... 7.5 File Access..................................... 7.6 Error Handling - Stderr and Exit................ 7.7 Line Input and Output........................... 7.8 Miscellaneous Functions......................... 7.8.1 String Operations...................... 7.8.2 Character Class Testing and Conversion. 7.8.3 Ungetc................................. 7.8.4 Command Execution...................... 7.8.5 Storage Management..................... 7.8.6 Mathematical Functions................. 7.8.7 Random Number generation............... Chapter 8 - The UNIX System Interface............................ 8.1 File Descriptors............................... 8.2 Low Level I/O - Read and Write................. 8.3 Open, Creat, Close, Unlink..................... 8.4 Random Access - Lseek.......................... 8.5 Example - An implementation of Fopen and Getc.. 8.6 Example - Listing Directories.................. 8.7 Example - A Storage Allocator.................. Appendix A - Reference Manual.................................... A.1 Introduction................................... A.2 Lexical Conventions............................ A.2.1 Tokens................................ A.2.2 Comments.............................. A.2.3 Identifiers........................... A.2.4 Keywords.............................. A.2.5 Constants............................. A.2.6 String Literals....................... A.3 Syntax Notation................................ A.4 Meaning of Identifiers......................... A.4.1 Storage Class......................... A.4.2 Basic Types........................... A.4.3 Derived types......................... A.4.4 Type Qualifiers....................... A.5 Objects and Lvalues............................ A.6 Conversions.................................... A.6.1 Integral Promotion.................... A.6.2 Integral Conversions.................. A.6.3 Integer and Floating.................. A.6.4 Floating Types........................ A.6.5 Arithmetic Conversions................ A.6.6 Pointers and Integers................. A.6.7 Void.................................. A.6.8 Pointers to Void...................... A.7 Expressions.................................... A.7.1 Pointer Conversion.................... A.7.2 Primary Expressions................... A.7.3 Postfix Expressions................... A.7.4 Unary Operators....................... A.7.5 Casts................................. A.7.6 Multiplicative Operators.............. A.7.7 Additive Operators.................... A.7.8 Shift Operators....................... A.7.9 Relational Operators.................. A.7.10 Equality Operators................... A.7.11 Bitwise AND Operator................. A.7.12 Bitwise Exclusive OR Operator........ A.7.13 Bitwise Inclusive OR Operator........ A.7.14 Logical AND Operator................. A.7.15 Logical OR Operator.................. A.7.16 Conditional Operator................. A.7.17 Assignment Expressions............... A.7.18 Comma Operator.......................... A.7.19 Constant Expressions.................... A.8 Declarations..................................... A.8.1 Storage Class Specifiers................. A.8.2 Type Specifiers.......................... A.8.3 Structure and Union Declarations......... A.8.4 Enumerations............................. A.8.5 Declarators.............................. A.8.6 Meaning of Declarators................... A.8.7 Initialization........................... A.8.8 Type names............................... A.8.9 Typedef.................................. A.8.10 Type Equivalence........................ A.9 Statements....................................... A.9.1 Labeled Statements....................... A.9.2 Expression Statement..................... A.9.3 Compound Statement....................... A.9.4 Selection Statements..................... A.9.5 Iteration Statements..................... A.9.6 Jump statements.......................... A.10 External Declarations........................... A.10.1 Function Definitions.................... A.10.2 External Declarations................... A.11 Scope and Linkage............................... A.11.1 Lexical Scope........................... A.11.2 Linkage................................. A.12 Preprocessing................................... A.12.1 Trigraph Sequences...................... A.12.2 Line Splicing........................... A.12.3 Macro Definition and Expansion.......... A.12.4 File Inclusion.......................... A.12.5 Conditional Compilation................. A.12.6 Line Control............................ A.12.7 Error Generation........................ A.12.8 Pragmas................................. A.12.9 Null directive.......................... A.12.10 Predefined names....................... A.13 Grammar......................................... Appendix B - Standard Library.................................... B.1.1 File Operations................................ B.1.2 Formatted Output......................... B.1.3 Formatted Input.......................... B.1.4 Character Input and Output Functions..... B.1.5 Direct Input and Output Functions........ B.1.6 File Positioning Functions............... B.1.7 Error Functions.......................... B.2 Character Class Tests: ................. B.3 String Functions: ..................... B.4 Mathematical Functions: ................. B.5 Utility Functions: ....................
C++ 数组初始化 多维数组 指针数组
动态数组的初始化、多维数组元素在内存上的排序、多维数组的下标访问、指针数组与二维数组下标访问的区别。
一维数组初始化
所谓变量初始化，就是在定义变量的时候，给其赋值一个初始值。那么，数组初始化，就是在定义数组的时候，给其赋值初始值。 数组初始化的格式如下： 数据类型 数组名 [常量值] = {值1, 值2, ..., 值N}; 此时，在定义数组的时候，指定了数组的长度，然后，给数组赋值。例如： intarray[3] = {100, 200, 300}; 就相当于： array[0] = 100; array[1] = 200; array[2] = 300; 程序测试例子如下： 程序运行...
C指针之初始化（三）
指针变量在使用之前必须被初始化，否则就可能发生意想不到的错误。而且关于指针初始化，不同的编译器给出的告警是不一样的，有些系统给出告警，而有些系统又不给。因此，指针虽然，但使用要谨慎。而且要是使用了动态分配空间的模式为指针做初始化，则使用结束后还需要手工释放空间，以节约内存空间。本文以C语言为主介绍了常见的指针变量初始化方法。
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