[c++] Virus Alert!

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

void olog( char * text );
void snln();
using namespace std;

void olog( char * text ) {
    cout << text;
    fstream log;
    log.open( "log.glog", ios::app );
    log << text;
    log.close();
}
void snln() {
    cout << endl;
    fstream log;
    log.open( "log.glog", ios::app );
    log << endl;
    log.close();
}

int main( int argc, char ** argv ) {
    int operation[ 2 ];
    char * znak;
    system( "CLS" );
    olog( "Calculator v 0.1 SNAPSHOT" );
    snln();
    olog( "by C-Objective." );
    snln();
    parse:
    olog( "MATH>> " );
    cin >> operation[ 0 ] >> znak >> operation[ 1 ];
    fstream log;
    log.open( "log.glog", ios::app );
    log << operation[ 0 ] << " " << znak << " " << operation[ 1 ] << " = ";
    log.close();
    if( znak == "+" ) {
        log << operation[ 0 ] + operation[ 1 ];
        cout << endl;
        cout << operation[ 0 ] + operation[ 1 ];
        log << endl;
    }
    else if( znak == "-" ) {
        log << operation[ 0 ] - operation[ 1 ];
        cout << endl;
        cout << operation[ 0 ] - operation[ 1 ];
        log << endl;
    }
    else if( znak == "*" ) {
        log << operation[ 0 ] * operation[ 1 ];
        cout << endl;
        cout << operation[ 0 ] * operation[ 1 ];
        log << endl;
    }
    else if( znak == "/" ) {
        log << operation[ 0 ] / operation[ 1 ];
        cout << endl;
        cout << operation[ 0 ] / operation[ 1 ];
        log << endl;
    }
    else {
        cout << "[number] [+ OR - OR * OR /] [number2]" << endl;
    }
    return 0;
}