我已经查看了其他一些类似的问题,但似乎所有功能都应该正确设置。在 CodeLite 中运行时一切都正确编译,但随后在使用 g++ 的 Linux 服务器上编译时,我在“main.cpp”中得到对函数 add_fraction、subtract_fraction、multiply_fraction、divide_fraction 错误的 undefined reference 我该如何解决这个问题?谢谢!
main.cpp
#include <iostream>
#include <string>
#include "header.h"
using std::cout;
using std::cin;
using std::endl;
int main()
{
int numerator;
int denominator;
int numerator2;
int denominator2;
char operation;
cout << "Input the numerator: ";
cin >> numerator;
cout << "Input the denominator: ";
cin >> denominator;
cout << "Input the numerator2: ";
cin >> numerator2;
cout << "Input the denominator: ";
cin >> denominator2;
cout << "Input the operation: ";
cin >> operation;
if (operation != '+' || '-' || '*' || '/'){
cout << "Please input a valid operator: ";
cin >> operation;
}
if (operation == '+'){
Rational addFrac;
addFrac.add_fraction(numerator, numerator2, denominator, denominator2);
}
if (operation == '-'){
Rational subFrac;
subFrac.subtract_fraction(numerator, numerator2, denominator, denominator2);
}
if (operation == '*'){
Rational multFrac;
multFrac.multiply_fraction(numerator, numerator2, denominator, denominator2);
}
if (operation == '/'){
Rational divideFrac;
divideFrac.divide_fraction(numerator, numerator2, denominator, denominator2);
}
return 0;
}
header.h
#ifndef HEADER_H
#define HEADER_H
class Rational{
public:
void reduce_fraction(int &top, int &bottom);
void add_fraction(int numerator, int denominator, int numerator2, int denominator2);
void subtract_fraction(int numerator, int denominator, int numerator2, int denominator2);
void multiply_fraction(int numerator, int denominator, int numerator2, int denominator2);
void divide_fraction(int numerator, int denominator, int numerator2, int denominator2);
};
#endif // HEADER_H
header.cpp
#include "header.h"
#include <iostream>
#include <string>
using std::cout;
using std::cin;
using std::endl;
void Rational::reduce_fraction (int & top, int & bottom)
{
for (int i = top * bottom; i > 1; i--) {
if ((top % i == 0) && (bottom % i == 0)) {
bottom /= i;
top /= i;
}
}
}
void Rational::add_fraction (int numerator, int numerator2, int denominator, int denominator2)
{
int top;
int bottom;
top = numerator2 * denominator + denominator2 * numerator;
bottom = denominator2 * denominator;
cout << "Improper Fraction -> ";
cout << top << "/" << bottom << endl;
cout << "Simplified (Rational) Fraction -> ";
if (top == bottom){
cout << "1" << endl;
}
else {
Rational redu;
redu.reduce_fraction(top, bottom);
cout << top << "/" << bottom << endl;
}
}
void Rational::subtract_fraction (int numerator, int numerator2, int denominator, int denominator2)
{
int top;
int bottom;
top = denominator2 * numerator - denominator * numerator2;
bottom = denominator2 * denominator;
cout << "Improper Fraction -> ";
cout << top << "/" << bottom << endl;
cout << "Simplified (Rational) Fraction -> ";
if (top == bottom){
cout << "1" << endl;
}
else {
Rational redu;
redu.reduce_fraction(top, bottom);
cout << top << "/" << bottom << endl;
}
}
void Rational::multiply_fraction (int numerator, int numerator2, int denominator, int denominator2)
{
int top;
int bottom;
top = numerator * numerator2;
bottom = denominator * denominator2;
cout << "Improper Fraction -> ";
cout << top << "/" << bottom << endl;
cout << "Simplified (Rational) Fraction -> ";
if (top == bottom){
cout << "1" << endl;
}
else {
Rational redu;
redu.reduce_fraction(top, bottom);
cout << top << "/" << bottom << endl;
}
}
void Rational::divide_fraction (int numerator, int numerator2, int denominator, int denominator2)
{
int top;
int bottom;
top = denominator2 * numerator;
bottom = numerator2 * denominator;
cout << "Improper Fraction -> ";
cout << top << "/" << bottom << endl;
cout << "Simplified (Rational) Fraction -> ";
if (top == bottom){
cout << "1" << endl;
}
else {
Rational redu;
redu.reduce_fraction(top, bottom);
cout << top << "/" << bottom << endl;
}
}
生成文件
CXX = g++
CXXFLAGS = -g
default: main
search: main.cpp
${CXX} ${CXXFLAGS} main.cpp -o search
clean:
rm -f *.o main
最佳答案
您根本没有构建 header.cpp
。你的 Makefile 中没有提到它。您需要编译它并将其链接到您的可执行文件中。试试这个:
search: main.cpp header.cpp
${CXX} ${CXXFLAGS} main.cpp header.cpp -o search
关于C++ undefined reference to function 错误仅在 g++ 编译器中,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28334947/