Question

C++里怎样用map将枚举类转换到string类

#include<stdio.h>
#include<stdlib.h>
#include <string>
#include <map>
#include <iostream>
using namespace std;
int main (void)
{
enum Name{AMY,JOHN,JOY};
map<Name, string> nameMap;
nameMap[AMY] = "AMY";
nameMap[JOHN] = "JOHN";
nameMap[JOY] = "JOY";Name salesname=JOHN;
string nameStr = nameMap[salesname];
cout<<nameStr<<endl;}这里的error怎样解决？

Answer 1

将map<Name, string> nameMap;改成map<int, string> nameMap; 改后为：#include<stdio.h>
#include<stdlib.h>
#include <string>
#include <map>
#include <iostream>
using namespace std;
int main ()
{
enum Name{AMY,JOHN,JOY};
map<int, string> nameMap;
nameMap[AMY] = "AMY";
nameMap[JOHN] = "JOHN";
nameMap[JOY] = "JOY"; Name salesname=JOHN;
string nameStr = nameMap[salesname];
cout<<nameStr<<endl;
return 0;}

Answer 2

#include<stdio.h>
#include<stdlib.h>
#include <string>
#include <map>
#include <iostream>
using namespace std;typedef enum {
AMY,
JOHN,
JOY
}Name;int main (void)
{map<Name, string> nameMap;
nameMap[AMY] = "AMY";
nameMap[JOHN] = "JOHN";
nameMap[JOY] = "JOY";Name salesname=JOHN;
string nameStr = nameMap[salesname];
cout<<nameStr<<endl;} 会出现很多警告，不要管他，直接运行就可以了，我用得是vc++6.0

Answer 3

反过来，把字符串转成enum值可以这样：
enum Graph { cicle=1 , rectangle, square}graph;
string cgraph;
map<string, Graph> namegraph;
namegraph["cicle"] = cicle;
namegraph["rectangle"] = rectangle;
namegraph["square"] = square;
cout << "please input the type of graph:(cicle/rectangle/square)";
cin >> cgraph;
switch (namegraph[cgraph]) {
case 1: ·····

Answer 4

这里没有看到error