c++ - 我有一个变量，结构中的许多变量之一，我想将信息读入其中

Question

在我决定使用这种技术输入信息之前，我能够得到一个干净的编译。一旦我克服了这个障碍，我将能够尝试各种场景并测试代码。

#include <iostream>
#include <sstream>
#include <string>

int main (void)
   {
    float test;                     /* a simple variable */

    struct seTup_backS_Format       /* the structure has about 30 variables */
       {
        float grnd_Elev;
        int many;     
       };

    string line;                    /* a string */

    getline(cin,line);
    stringstream (line) >> test;    // no problem

                                    // when I try

    stringsteam (line) >> seTup_backS_Format.grnd_Elev;    

               // the compiler says, expected primary-expression before '.' token ----

   }

Answer 1

您已经声明了一个结构类型，但没有声明一个结构变量。您应该按如下方式更改代码:

struct seTup_backS_Format       /* the structure has about 30 variables */
   {
    float grnd_Elev;
    int many;     
   } setup; // Declare a variable "setup" of type "struct seTup_backS_Format"

string line;                    /* a string */

getline(cin,line);
stringstream (line) >> test;    // no problem

                                // when I try

stringsteam (line) >> setup.grnd_Elev;