C++ : Read a string, and break words by space ....

 Hi C++ Experts,

     I  want  to write a code, which read the first line of a file, and then determine how many columns are there in the first line (so will be in the file). The columns are separated by space. I wrote the following code, but it is kind of ugly and I don't like it ....... I am wondering if anyone could please suggest  some more elegant ways of doing this ? (Perhaps need to incorporate some script ?) I want all in one program, since I would need to declare something later in the code based on the number of columns in the file.

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#include <fstream>
#include <iostream>
#include <string>

int main()
{
    ifstream input("Person.txt") ;
    ofstream output("temp_file.txt") ;
    string temp ;
    getline(input, temp) ;
    output << temp ;
    output.close() ;

    ifstream input1("temp_file.txt") ;
    cout << "the columns of the file are: " << endl ;
    while(input1){
     string temp1 ;
     input1 >> temp1 ;
     cout << temp1 << endl ;
    }
 
    system("rm temp_file.txt") ;

    return 0 ;
}
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and the Person.txt looks like :

Name     Age     Height    Weight    Eye_colors
John     11      5'2"       100lbs    brown
Mary     15      6'         150lbs    green
Dave     12      5'5"       140lbs    blue