我正在从Edward Schneinerman的C++学习C++的数学家。我工作的最大公约数部分第2章中我取得了三个文件:编译一个C++程序头文件(新手)
gcd.h
#ifndef GCD_H
#define GCD_H
long gcd(long a, long b);
#endif
gcd.cc
#include "gcd.h"
#include<iostream>
using namespace std;
long gcd(long a, long b) {
if(a == 0 && b == 0) {
cerr << "WARNING: gcd(0,0) not defined" << endl;
return 0;
}
if(a < 0) a = -a;
if(b < 0) b = -b;
if(b == 0) retrun a;
if(a == 0) return b;
long c = a % b;
return gcd(b,c);
}
和gcdtest.cc
#include "gcd.h"
#include <iostream>
using namespace std;
int main() {
long a,b;
cout << "Enter the first number > ";
cin >> a;
cout << "Enter the second number > ";
cin >> b;
long d = gcd(a,b);
cout << "The gcd of " << a << " and " << b << " is " << d << endl;
return 0;
}
所有这些文件驻留在相同的目录中。当我尝试编译gcdtest.cc
$ g++ -Wall gcdtest.cc -o gcdtest.exe
我收到以下错误:
$ g++ -Wall gcdtest.cc -o gcdtest.exe
Undefined symbols for architecture x86_64:
"gcd(long, long)", referenced from:
_main in ccgbCyQO.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
我全新的C++和还没有完全grokked编译和链接。我究竟做错了什么?
您还没有编译你的gcd.cc文件,因此联动寻找最大公约数时失败函数 – SomeWittyUsername 2013-03-04 15:24:19
另外,你在'gcd.cc'中有一个输入错误。 'retrun!= return' – MikeTheLiar 2013-03-04 15:42:29