在Ubuntu的C++程序编译失败，但在MacOSX中工作

Question

您好我有一个用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。我不知道为什么会发生。

Ubuntu的g ++编译器版本是4.7.3。

这里是我的代码示例

#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); 
} 

我获得以下错误

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

Answer 1

您需要包括stdio.h为fwrite和FILE。

#include <stdio.h> 

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