枚举麻烦：重新声明为不同类型的符号
我正在编写一个程序，旨在帮助我了解 C++ 中的枚举数据类型。当前的问题是，当我尝试使用新数据类型时，编译器不喜欢我使用枚举，就像我使用其他数据类型一样。编译 tangleShape 函数时出现错误“重新声明为不同类型的符号”。看一下相关代码。任何见解表示赞赏！谢谢！
（所有函数都是自己的.cpp文件。）
头文件
#ifndef HEADER_H_INCLUDED
#define HEADER_H_INCLUDED
#include <iostream>
#include <iomanip>
using namespace std;
enum triangleType {noTriangle, scalene, isoceles, equilateral};
//prototypes
void extern input(float&, float&, float&);
triangleType extern triangleShape(float, float, float);
/*void extern output (float, float, float);*/
void extern myLabel(const char *, const char *);
#endif // HEADER_H_INCLUDED
主函数
//8.1 main
// this progam...
#include "header.h"
int main()
{
float sideLength1, sideLength2, sideLength3;
char response;
do //main loop
{
input (sideLength1, sideLength2, sideLength3);
triangleShape (sideLength1, sideLength2, sideLength3);
//output (sideLength1, sideLength2, sideLength3);
cout << "\nAny more triangles to analyze? (y,n) ";
cin >> response;
}
while (response == 'Y' || response == 'y');
myLabel ("8.1", "2/11/2011");
return 0;
}
triangleShape形状
# include "header.h"
triangleType triangleShape(sideLenght1, sideLength2, sideLength3)
{
triangleType triangle;
return triangle;
}
I am writing a program that is supposed to help me learn about enumeration data types in C++. The current trouble is that the compiler doesn't like my enum usage when trying to use the new data type as I would other data types. I am getting the error "redeclared as different kind of symbol" when compiling my trangleShape function. Take a look at the relevant code. Any insight is appreciated! Thanks!
(All functions are their own .cpp files.)
header file
#ifndef HEADER_H_INCLUDED
#define HEADER_H_INCLUDED
#include <iostream>
#include <iomanip>
using namespace std;
enum triangleType {noTriangle, scalene, isoceles, equilateral};
//prototypes
void extern input(float&, float&, float&);
triangleType extern triangleShape(float, float, float);
/*void extern output (float, float, float);*/
void extern myLabel(const char *, const char *);
#endif // HEADER_H_INCLUDED
main function
//8.1 main
// this progam...
#include "header.h"
int main()
{
float sideLength1, sideLength2, sideLength3;
char response;
do //main loop
{
input (sideLength1, sideLength2, sideLength3);
triangleShape (sideLength1, sideLength2, sideLength3);
//output (sideLength1, sideLength2, sideLength3);
cout << "\nAny more triangles to analyze? (y,n) ";
cin >> response;
}
while (response == 'Y' || response == 'y');
myLabel ("8.1", "2/11/2011");
return 0;
}
triangleShape shape
# include "header.h"
triangleType triangleShape(sideLenght1, sideLength2, sideLength3)
{
triangleType triangle;
return triangle;
}
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你的问题与枚举无关。问题是你的 triangleShape 定义中的这一行：
你缺少参数的类型，并且某些编译器（例如 gcc）默认为
int（尽管这不是标准行为，所以你永远不应该依赖它）。由于函数定义使用float，编译器将其视为以不同方式重新声明。您应该在实现中使用指定的float：Your problem has nothing to do with enums. The problem line is this line in your triangleShape definition:
You're missing the types for your parameters and some compilers such as gcc default to
int(although this isn't standard behaviour so you should never rely on it). Since the function definition usesfloats the compiler sees it as redeclaring it differently. You should use specifyfloats in the implementation: