在Ubuntu中C ++程序编译失败，但在MacOSX中起作用 [英] C++ program compilation fails in Ubuntu, but works in MacOSX

问题描述

你好我有一个用C ++编写的程序。当我用g ++编译器在Mac终端中编译它时，它编译并运行。但是当我用g ++编译器在Ubuntu终端中编译相同的C ++程序时，它失败了。我不知道它为什么会发生。

Ubuntu中的g ++编译器版本是4.7.3。

是我的代码示例

  #include< iostream> 
 
使用namespace std; 
 
 #define IXSIZE 400 
 #define IYSIZE 400 
 #define IZSIZE 3 
 
 void putbyte（FILE * outf，unsigned char val）
 {
 unsigned char buf [1]; 
 
 buf [0] = val; 
 fwrite（buf，1,1，outf）; 
 
 
 void putshort（FILE * outf，unsigned short val）
 {
 unsigned char buf [2]; 
 
 buf [0] =（val>> 8）; 
 buf [1] =（val>> 0）; 
 fwrite（buf，2,1，outf）; 
} 
  

我得到以下错误：

seperate.cpp：函数'void putbyte（FILE *，unsigned char）'：
seperate.cpp：23：21：错误：'fwrite'未在此范围内声明
seperate.cpp：函数'void putshort（FILE *，short unsigned int）'：
seperate.cpp：32：21：错误：'fwrite'未在此范围内声明
seperate.cpp：函数'int putlong（FILE *，long unsigned int）'：
seperate.cpp：43：28：错误：'fwrite'未在此范围内声明
seperate.cpp：在函数'short unsigned int getshort（FILE *）'中：
seperate.cpp：49：22：错误：'fread'未在此作用域中声明
seperate.cpp：在函数'long int getlong （FILE *）'：
seperate.cpp：56：22：错误：'fread'未在此作用域中声明
seperate.cpp：在函数'int main（int，char **）' ：
seperate.cpp：88：11：错误：'stderr'未在此范围内声明
seperate.cpp：88：69：错误：'fprin tf'未在此范围中声明
seperate.cpp：89：9：错误：'exit'未在此范围内声明
seperate.cpp：93：30：错误：'fopen'不是在此作用域中声明
seperate.cpp：95：11：错误：'stderr'未在此作用域中声明
seperate.cpp：95：61：错误：'fprintf'未在此作用域中声明
seperate.cpp：96：9：错误：'exit'未在此作用域中声明
seperate.cpp：101：22：错误：'fgetc'未在此作用域中声明
seperate.cpp：114：18：错误：'SEEK_CUR'未在此作用域中声明
seperate.cpp：114：26：错误：'fseek'未在此作用域中声明
seperate.cpp： 126：38：错误：'fread'未在此作用域中声明
seperate.cpp：131：12：错误：'fclose'未在此作用域中声明
seperate.cpp：138：25：错误：'fopen'未在此作用域中声明
seperate.cpp：141：11：错误：'stderr'未在此作用域中声明
seperate.cpp：141：54：错误：'fprintf '是n在此范围内声明
seperate.cpp：142：9：错误：'exit'未在此作用域中声明
seperate.cpp：153：36：错误：'fwrite'未在此处声明范围
seperate.cpp：162：11：错误：'stderr'未在此范围内声明
seperate.cpp：162：54：错误：'fprintf'未在此范围内声明
seperate.cpp：163：9：错误：'exit'未在此作用域中声明
seperate.cpp：174：36：错误：'fwrite'未在此作用域中声明
seperate.cpp ：183：11：错误：'stderr'未在此作用域中声明
seperate.cpp：183：54：错误：'fprintf'未在此作用域中声明
seperate.cpp：184：9 ：错误：'exit'未在此范围中声明
seperate.cpp：195：36：错误：'fwrite'未在此范围内声明
dfo @ ubuntu：〜/ Desktop / abc-master $ g ++ -v


解决方案

您需要包含 stdio.h 用于 fwrite 和 FILE 。

  #include< stdio.h> 
  

该标准允许标题包含其他标题，但不能依赖这些间接包含。您需要明确包含您打算使用的每个标题。

Hi I've a program written in C++. When I compile it in Mac terminal with g++ compiler, it compiles and runs. But when I compile the same C++ program in Ubuntu terminal with g++ compiler, it Fails. I don't know why it happens.

g++ compiler version in Ubuntu is 4.7.3.

Here is my code sample

#include <iostream>

using namespace std;

#define IXSIZE 400
#define IYSIZE 400
#define IZSIZE 3

void putbyte(FILE *outf, unsigned char val)
{ 
    unsigned char buf[1]; 

    buf[0] = val; 
    fwrite(buf,1,1,outf); 
} 

void putshort(FILE *outf, unsigned short val) 
{ 
    unsigned char buf[2]; 

    buf[0] = (val>>8); 
    buf[1] = (val>>0); 
    fwrite(buf,2,1,outf); 
} 

I get following error

seperate.cpp: In function ‘void putbyte(FILE*, unsigned char)’: seperate.cpp:23:21: error: ‘fwrite’ was not declared in this scope seperate.cpp: In function ‘void putshort(FILE*, short unsigned int)’: seperate.cpp:32:21: error: ‘fwrite’ was not declared in this scope seperate.cpp: In function ‘int putlong(FILE*, long unsigned int)’: seperate.cpp:43:28: error: ‘fwrite’ was not declared in this scope seperate.cpp: In function ‘short unsigned int getshort(FILE*)’: seperate.cpp:49:22: error: ‘fread’ was not declared in this scope seperate.cpp: In function ‘long int getlong(FILE*)’: seperate.cpp:56:22: error: ‘fread’ was not declared in this scope seperate.cpp: In function ‘int main(int, char**)’: seperate.cpp:88:11: error: ‘stderr’ was not declared in this scope seperate.cpp:88:69: error: ‘fprintf’ was not declared in this scope seperate.cpp:89:9: error: ‘exit’ was not declared in this scope seperate.cpp:93:30: error: ‘fopen’ was not declared in this scope seperate.cpp:95:11: error: ‘stderr’ was not declared in this scope seperate.cpp:95:61: error: ‘fprintf’ was not declared in this scope seperate.cpp:96:9: error: ‘exit’ was not declared in this scope seperate.cpp:101:22: error: ‘fgetc’ was not declared in this scope seperate.cpp:114:18: error: ‘SEEK_CUR’ was not declared in this scope seperate.cpp:114:26: error: ‘fseek’ was not declared in this scope seperate.cpp:126:38: error: ‘fread’ was not declared in this scope seperate.cpp:131:12: error: ‘fclose’ was not declared in this scope seperate.cpp:138:25: error: ‘fopen’ was not declared in this scope seperate.cpp:141:11: error: ‘stderr’ was not declared in this scope seperate.cpp:141:54: error: ‘fprintf’ was not declared in this scope seperate.cpp:142:9: error: ‘exit’ was not declared in this scope seperate.cpp:153:36: error: ‘fwrite’ was not declared in this scope seperate.cpp:162:11: error: ‘stderr’ was not declared in this scope seperate.cpp:162:54: error: ‘fprintf’ was not declared in this scope seperate.cpp:163:9: error: ‘exit’ was not declared in this scope seperate.cpp:174:36: error: ‘fwrite’ was not declared in this scope seperate.cpp:183:11: error: ‘stderr’ was not declared in this scope seperate.cpp:183:54: error: ‘fprintf’ was not declared in this scope seperate.cpp:184:9: error: ‘exit’ was not declared in this scope seperate.cpp:195:36: error: ‘fwrite’ was not declared in this scope dfo@ubuntu:~/Desktop/abc-master$ g++ -v

解决方案

You need to include stdio.h for fwrite and FILE.

#include <stdio.h>

The standard allows headers to include other headers, but you cannot rely on these indirect includes. You need to explicitly include every header you intend to use.

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