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#include fstream;
#include iostream;
using namespace std;
 
int main()
{
 
 
    ifstream asd("asd.txt");
    if(false == asd.is_open())
    {
        cout << "Can not open input file" << std::endl;
 
        return 0 ;
    }
 
    float val = 0.0f;
    string inputString;
 
    //We need load on line
    getline(asd, inputString);
 
    if(true == inputString.empty())
    {
        cout << "File is empty" << std::endl;
 
        return 0 ;
    }
 
    try
    {
        val = stof(inputString);
    }
    catch(exception exp)
    {
        cout << "Input data is not valid." << std::endl;
 
        return 0;
    }
 
    cout << "Value: " << val << std::endl;
 
    system("Pause");
}

prog.cpp:1:10: error: #include expects "FILENAME" or <FILENAME>
 #include fstream;
          ^
prog.cpp:2:10: error: #include expects "FILENAME" or <FILENAME>
 #include iostream;
          ^
prog.cpp: In function 'int main()':
prog.cpp:9:5: error: 'ifstream' was not declared in this scope
     ifstream asd("asd.txt");
     ^
prog.cpp:10:17: error: 'asd' was not declared in this scope
     if(false == asd.is_open())
                 ^
prog.cpp:12:9: error: 'cout' was not declared in this scope
         cout << "Can not open input file" << std::endl;
         ^
prog.cpp:12:46: error: 'endl' is not a member of 'std'
         cout << "Can not open input file" << std::endl;
                                              ^
prog.cpp:18:5: error: 'string' was not declared in this scope
     string inputString;
     ^
prog.cpp:21:13: error: 'asd' was not declared in this scope
     getline(asd, inputString);
             ^
prog.cpp:21:18: error: 'inputString' was not declared in this scope
     getline(asd, inputString);
                  ^
prog.cpp:21:29: error: 'getline' was not declared in this scope
     getline(asd, inputString);
                             ^
prog.cpp:25:9: error: 'cout' was not declared in this scope
         cout << "File is empty" << std::endl;
         ^
prog.cpp:25:36: error: 'endl' is not a member of 'std'
         cout << "File is empty" << std::endl;
                                    ^
prog.cpp:32:31: error: 'stof' was not declared in this scope
         val = stof(inputString);
                               ^
prog.cpp:34:11: error: 'exception' does not name a type
     catch(exception exp)
           ^
prog.cpp:36:9: error: 'cout' was not declared in this scope
         cout << "Input data is not valid." << std::endl;
         ^
prog.cpp:36:47: error: 'endl' is not a member of 'std'
         cout << "Input data is not valid." << std::endl;
                                               ^
prog.cpp:41:5: error: 'cout' was not declared in this scope
     cout << "Value: " << val << std::endl;
     ^
prog.cpp:41:33: error: 'endl' is not a member of 'std'
     cout << "Value: " << val << std::endl;
                                 ^
prog.cpp:43:19: error: 'system' was not declared in this scope
     system("Pause");
                   ^

Standard output is empty