fork download

copy

 int main()
    {
        std::ifstream file( "data.txt" ) ;
        std::string search_str = "Man" ;
        std::string line_1 ;
        std::string line_2;
        int line_number = 0 ;
        while( std::getline( file, line_1 ) )
        {
            ++line_number ;
 
            if( line_1.find(search_str) != std::string::npos )
            {
                std::cout<<line_1<<'\n';
                std::getline(file,line_2);
                std::cout<<line_2<<'\n';
            }
 
        }
 
        return (0);
    }

prog.cpp: In function ‘int main()’:
prog.cpp:3:9: error: ‘ifstream’ is not a member of ‘std’
         std::ifstream file( "data.txt" ) ;
         ^
prog.cpp:3:23: error: expected ‘;’ before ‘file’
         std::ifstream file( "data.txt" ) ;
                       ^
prog.cpp:4:9: error: ‘string’ is not a member of ‘std’
         std::string search_str = "Man" ;
         ^
prog.cpp:4:21: error: expected ‘;’ before ‘search_str’
         std::string search_str = "Man" ;
                     ^
prog.cpp:5:9: error: ‘string’ is not a member of ‘std’
         std::string line_1 ;
         ^
prog.cpp:5:21: error: expected ‘;’ before ‘line_1’
         std::string line_1 ;
                     ^
prog.cpp:6:9: error: ‘string’ is not a member of ‘std’
         std::string line_2;
         ^
prog.cpp:6:21: error: expected ‘;’ before ‘line_2’
         std::string line_2;
                     ^
prog.cpp:8:16: error: ‘getline’ is not a member of ‘std’
         while( std::getline( file, line_1 ) )
                ^
prog.cpp:8:30: error: ‘file’ was not declared in this scope
         while( std::getline( file, line_1 ) )
                              ^
prog.cpp:8:36: error: ‘line_1’ was not declared in this scope
         while( std::getline( file, line_1 ) )
                                    ^
prog.cpp:12:29: error: ‘search_str’ was not declared in this scope
             if( line_1.find(search_str) != std::string::npos )
                             ^
prog.cpp:12:49: error: ‘std::string’ has not been declared
             if( line_1.find(search_str) != std::string::npos )
                                                 ^
prog.cpp:14:17: error: ‘cout’ is not a member of ‘std’
                 std::cout<<line_1<<'\n';
                 ^
prog.cpp:15:17: error: ‘getline’ is not a member of ‘std’
                 std::getline(file,line_2);
                 ^
prog.cpp:15:35: error: ‘line_2’ was not declared in this scope
                 std::getline(file,line_2);
                                   ^
prog.cpp:16:17: error: ‘cout’ is not a member of ‘std’
                 std::cout<<line_2<<'\n';
                 ^

Standard output is empty