我正在研究C ++,我正在尝试学习如何使用头文件。但是,当我运行程序时总会出错。
/* File add.h */
#ifndef ADD_H
#define ADD_H
int add(int, int);
#endif
/* ADD_H */
/* File add.cpp */
#include "add.h"
int add(int a, int b)
{
return a + b;
}
/* File triple.cpp */
#include<iostream>
#include "add.h"
using namespace std;
int triple(int);
int triple(int x)
{
return add(x, add(x, x));
}
int main()
{
int i=0;
int j;
while (i<=5)
{ j=triple(i);
cout<<j<<endl;
//cout<<triple(j)<<endl;
i++;
}
return 0;
}
这些是我使用的3个文件。当我运行:g ++ triple.cpp 在mac上,错误如下:
Undefined symbols for architecture x86_64:
"add(int, int)", referenced from:
triple(int) in triple-e0558f.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
谁可以给我一些关于这个错误的提示。非常感谢! 顺便说一句,gcc版本信息如下:
gcc --version
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/c++/4.2.1
Apple LLVM version 6.0 (clang-600.0.51) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix
答案 0 :(得分:1)
两种编译方式:
一个。一个一个地编译
g++ -c add.cpp -o add.o
g++ -c triple.cpp -o triple.o
g++ add.o triple.o -o triple
湾一次编译所有内容
g++ add.cpp triple.cpp -o triple