Question

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.

Answer 1

istream constructor expects a streambuf. You probably want to use istringstream:

istringstream cinx(argv[i]);

and #include <sstream> in the beginning.

Besides, you’re computing the sum, not the product.