[英]C++ undefined reference to function error in g++ compiler only
我已经看过其他一些这样的问题,但是似乎应该正确设置所有功能。 在CodeLite中运行时,所有内容均可正确编译,但随后在使用g ++的Linux服务器上进行编译时,我在'main.cpp'中得到对函数add_fraction,subtract_fraction,multiple_fraction,divide_fraction错误的未定义引用。如何解决此问题? 谢谢!
main.cpp中
#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;
}
}
Makefile文件
CXX = g++
CXXFLAGS = -g
default: main
search: main.cpp
${CXX} ${CXXFLAGS} main.cpp -o search
clean:
rm -f *.o main
您根本没有构建header.cpp
。 您的Makefile中未提及。 您需要对其进行编译并将其链接到您的可执行文件中。 尝试这个:
search: main.cpp header.cpp
${CXX} ${CXXFLAGS} main.cpp header.cpp -o search
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