使用流的命令行浮动输入和输出

发布于 2024-12-09 19:46:40 字数 877 浏览 0 评论 0原文

我在这个网站上的第一个问题是：

我正在研究一个教程问题，它要求我编写一个程序，从命令行输出一些输入的浮点数的乘积：这是使用流来完成的。现在在我的教程书中建议使用以下代码：

#include <iostream>
#include <cstdio>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <fstream>
#include <string>
#include <cstdlib>
#include <istream>
using namespace std;

int main(  int argc, char* argv[] ) 
{  

          float data[20];
          int i;
          float sum;

          for(i=1;i<argc-1;i++){

              istream cinx(81,argv[i];

              cinx>>data[i];
              cout<<data[i];

              sum=sum+data[i];
         }
         cout<<"\nsum = "<<sum;
}

所以我尝试了上面的代码和许多不同的变体，直到我的头发掉光！ - 但无济于事，因为它无法编译，而是收到以下错误消息：

“没有匹配的函数用于调用 `std::basic_istream >::get(char**&, int)”

任何如有建议，我们将不胜感激。

原文

My first question on this site, here goes:

I am working on a tutorial question and it asks me to write a program that outputs the product of some entered floating point numbers from the command line: This is to be done using streams.
Now in My tutorial book it suggests using the following code:

#include <iostream>
#include <cstdio>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <fstream>
#include <string>
#include <cstdlib>
#include <istream>
using namespace std;

int main(  int argc, char* argv[] ) 
{  

          float data[20];
          int i;
          float sum;

          for(i=1;i<argc-1;i++){

              istream cinx(81,argv[i];

              cinx>>data[i];
              cout<<data[i];

              sum=sum+data[i];
         }
         cout<<"\nsum = "<<sum;
}

So I have tried the above code and many different variations until my hair is falling out! - But to no avail as it does not compile, instead I get the error message along the lines of:

" no matching function for call to `std::basic_istream >::get(char**&, int)"

Any suggestions would be much appreciated.

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游魂 2024-12-16 19:46:40

感谢outybungalobill和Paul R的帮助。

最终编译并成功运行的代码是：

#include <iostream>
#include <sstream>

using namespace std;

int main(  int argc, char* argv[] ) 
{  

          float data[20];
          int i;
          float sum = 0.0f;

          for(i=1;i<argc;i++){


              istringstream cinx(argv[i]);

              cinx>>data[i];
              cout<<data[i];

              sum=sum+data[i];
         }
         cout<<"\nsum = "<<sum<<"\n";

   system ("PAUSE");
   return 0;
}

Thanks for Helping outybungalobill and Paul R.

The final code which compiled and runs successfully is:

#include <iostream>
#include <sstream>

using namespace std;

int main(  int argc, char* argv[] ) 
{  

          float data[20];
          int i;
          float sum = 0.0f;

          for(i=1;i<argc;i++){


              istringstream cinx(argv[i]);

              cinx>>data[i];
              cout<<data[i];

              sum=sum+data[i];
         }
         cout<<"\nsum = "<<sum<<"\n";

   system ("PAUSE");
   return 0;
}

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