错误LNK 1120和LNK 2001 [英] error LNK 1120 and LNK 2001
本文介绍了错误LNK 1120和LNK 2001的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
嘿，我正在做一个程序，做了很多简单的事情，显示我的老师，我已经学会使用功能。我已经反复阅读这个论坛，并检查了许多其他的，但没有一个似乎解决我的问题。
下面的代码是链接（我想），我得到这些错误列表中的消息：
错误LNK1120：1未解决的外部
错误LNK2001：未解析的外部符号_mainCRTStartup
<
#include< iostream.h>
#include< math.h>
using namespace std;
int a;
int b;
float c;
int d;
float p_theorem（int side_a，int side_b）{
return sqrtf（（side_a * side_a）+（side_b * side_b））;
}
float p_theorem_reverse（int side_c，int side_d）{
return sqrtf（（side_c * side_c） - （side_d * side_d））;
}
void game（int x）{
if（x< 5）{
cout<<Your number is too low< ; endl<<请再猜一次：;
cin>>> x;
}
else if（x> 5）{
cout<<<Your number is too big<< endl<<Please guess again：
cin>> x
}
else（x == 5）{
cout<<Good job，You guessed the number！<< endl;
system（PAUSE）;
}
}
void stuff（）{
cout<<由Ely Eastman开发<<< endl< Rogers Secondary School，Houston，TX<<< endl;
system（PAUSE）;
}
int main（void）
{
cout<<Welcome to the Multi-Function Program<< endl
< ;<输入1以找到直角三角形的斜边<<<输入2用于发现直角三角形的边<< endl
< ;<为猜测游戏Beta输入3<< endl
<<为开发者信息输入4<< endl;
cin>> d
if（d == 1）{
cout<<Welcome to the Pythagorean Theorem Solver<< endl
<<请输入三角形的一条腿的长度：;
cin>> a;
cout<<请输入三角形另一条腿的长度：;
cin>> b;
c = p_theorem（a，b）;
cout<<斜边的长度为<< c<< endl;
system（PAUSE）;
}
else if（d == 2）{
cout<<欢迎来到逆向毕达哥拉斯定理<< endl
< Hypotenuse的长度：;
cin>> a;
cout<<请输入已知腿长度：;
cin>> b;
c = p_theorem_reverse（a，b）;
cout<<腿的长度是：<< g<< endl;
system（PAUSE）
}
else if（d == 3）{
cout<<Welcome to the Guessing Game Beta<< endl
<<请猜数字1-10：;
cin<< a
game（a）;
}
else if（d == 4）{
stuff（）;
}
return 0;
}
解决方案
;和一个缺少的if语句。此外，游戏g的长度未定义。你的cin>>操作符在某些情况下是相反的...
编辑：As Neil在评论中指出，你可能需要指定你创建控制台应用程序。
工作？代码（请尝试注意我改变了什么，而不是复制/粘贴它，一些错误是相当基本的知识）：
#include< iostream>
#include< math.h>
using namespace std;
int a;
int b;
float c;
int d;
float p_theorem（int side_a，int side_b）{
return sqrtf（（side_a * side_a）+（side_b * side_b））;
}
float p_theorem_reverse（int side_c，int side_d）{
return sqrtf（（side_c * side_c） - （side_d * side_d））;
}
void game（int x）
{
if（x< 5）
{
cout<数字太低<<< endl<<请再猜：
cin>> x;
}
else if（x> 5）{
cout<<<Your number is too big<< endl<<Please guess again：
cin>> x;
}
else if（x == 5）
{
cout<<好工作，你猜到了数字！<< endl;
system（PAUSE）;
}
}
void stuff（）{
cout<<由Ely Eastman开发<<< endl< Rogers Secondary School，Houston，TX<<< endl;
system（PAUSE）;
}
int main（void）
{
cout<<Welcome to the Multi-Function Program<< endl
< ;<输入1以找到直角三角形的斜边<<<输入2用于发现直角三角形的边<< endl
< ;<为猜测游戏测试版输入3<< endl
<<为开发者信息输入4<< endl;
cin>> d;
if（d == 1）{
cout<<欢迎来到毕达哥拉斯定理解算器<
cin>> a;
cout<<请输入三角形另一条腿的长度：;
cin>> b;
c = p_theorem（a，b）;
cout<<斜边的长度为<< c<< endl;
system（PAUSE）;
}
else if（d == 2）{
cout<<欢迎来到逆向毕达哥拉斯定理<< endl
< Hypotenuse的长度：;
cin>> a;
cout<<请输入已知腿长度：;
cin>> b;
c = p_theorem_reverse（a，b）;
cout<<腿的长度是：<< c<< endl; //< - 什么是g？我想你有一个typo
系统（PAUSE）;
}
else if（d == 3）{
cout<<欢迎来到猜测游戏测试版<
cin>> a;
game（a）;
}
else if（d == 4）{
stuff（）;
}
return 0;
}
Hey guys i am working on a program that does many simple things to show my teacher that i have learned to use functions. i have repeatedly read this forum and checked many other ones but none of them seem to solve my problem. as the code below is linking ( i think ), I get these messages in the error list:
error LNK1120: 1 unresolved externals
error LNK2001: unresolved external symbol_mainCRTStartup
Can someone please help me solve this!
Here is my code
#include <iostream.h>
#include <math.h>
using namespace std;
int a;
int b;
float c;
int d;
float p_theorem (int side_a, int side_b){
return sqrtf((side_a * side_a)+(side_b * side_b));
}
float p_theorem_reverse (int side_c, int side_d){
return sqrtf((side_c * side_c)-(side_d * side_d));
}
void game(int x){
if (x < 5){
cout<<"Your number is too low"<<endl<<"Please guess again: ";
cin>>x;
}
else if (x > 5){
cout<<"Your number is too big"<<endl<<"Please guess again: ";
cin>>x
}
else (x == 5){
cout<<"Good job, You guessed the number!"<<endl;
system("PAUSE");
}
}
void stuff(){
cout<<"Developed by Ely Eastman"<<endl<<"Computer 35, T.H. Rogers Secondary School, Houston, TX"<<endl;
system("PAUSE");
}
int main(void)
{
cout<<"Welcome to the Multi-Function Program"<<endl
<<"Enter 1 for finding the hypotenuse of a right triangle"<<endl
<<"Enter 2 for finding the leg of a right triangle"<<endl
<<"Enter 3 for the Guessing Game Beta"<<endl
<<"Enter 4 for Developer Information"<<endl;
cin>>d
if (d == 1){
cout<<"Welcome to the Pythagorean Theorem Solver"<<endl
<<"Please enter the length of one leg of the triangle: ";
cin>>a;
cout<<"Please enter the length of the other leg of the triangle: ";
cin>>b;
c = p_theorem(a, b);
cout<<"The length of the hypotenuse is "<<c<<endl;
system("PAUSE");
}
else if (d == 2){
cout<<"Welcome to the Reverse Pythagorean Theorem"<<endl
<<"Please enter the length of the Hypotenuse: ";
cin>>a;
cout<<"Please enter the length of the known leg: ";
cin>>b;
c = p_theorem_reverse(a, b);
cout<<"The length of the leg is: "<<g<<endl;
system("PAUSE")
}
else if (d == 3){
cout<<"Welcome to the Guessing Game Beta"<<endl
<<"Please guess a number 1-10: ";
cin<<a
game(a);
}
else if (d == 4){
stuff();
}
return 0;
}
解决方案
You have dozens of missing ";" and a missing if statement. Also the length of the game "g" is undefined. And your cin ">>" operators are reversed in some cases ...
Edit: As Neil pointed out in the comments, you probably need to specify that you are creating a console application.
Working? Code (Please try to notice what I changed and not just copy/paste it, some of the mistakes are pretty basic knowledge):
#include <iostream>
#include <math.h>
using namespace std;
int a;
int b;
float c;
int d;
float p_theorem (int side_a, int side_b){
return sqrtf((side_a * side_a)+(side_b * side_b));
}
float p_theorem_reverse (int side_c, int side_d){
return sqrtf((side_c * side_c)-(side_d * side_d));
}
void game(int x)
{
if (x < 5)
{
cout<<"Your number is too low"<<endl<<"Please guess again: ";
cin>>x;
}
else if (x > 5){
cout<<"Your number is too big"<<endl<<"Please guess again: ";
cin>>x;
}
else if (x == 5)
{
cout<<"Good job, You guessed the number!"<<endl;
system("PAUSE");
}
}
void stuff(){
cout<<"Developed by Ely Eastman"<<endl<<"Computer 35, T.H. Rogers Secondary School, Houston, TX"<<endl;
system("PAUSE");
}
int main(void)
{
cout<<"Welcome to the Multi-Function Program"<<endl
<<"Enter 1 for finding the hypotenuse of a right triangle"<<endl
<<"Enter 2 for finding the leg of a right triangle"<<endl
<<"Enter 3 for the Guessing Game Beta"<<endl
<<"Enter 4 for Developer Information"<<endl;
cin>>d;
if (d == 1){
cout<<"Welcome to the Pythagorean Theorem Solver"<<endl
<<"Please enter the length of one leg of the triangle: ";
cin>>a;
cout<<"Please enter the length of the other leg of the triangle: ";
cin>>b;
c = p_theorem(a, b);
cout<<"The length of the hypotenuse is "<<c<<endl;
system("PAUSE");
}
else if (d == 2){
cout<<"Welcome to the Reverse Pythagorean Theorem"<<endl
<<"Please enter the length of the Hypotenuse: ";
cin>>a;
cout<<"Please enter the length of the known leg: ";
cin>>b;
c = p_theorem_reverse(a, b);
cout<<"The length of the leg is: "<<c<<endl; // <- What is g?!!! I think you had a typo
system("PAUSE");
}
else if (d == 3){
cout<<"Welcome to the Guessing Game Beta"<<endl
<<"Please guess a number 1-10: ";
cin>>a;
game(a);
}
else if (d == 4){
stuff();
}
return 0;
}
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