Calculator

#include <iostream>
#include <string>
#include <fstream>
using namespace std;

//Version
string ver = "1.2";

//Variables
int input;
double input1;
double input2;
double sum;
double mem1;
double mem2;
double mem3;
double mem4;
int note_num = 1;
string f_input;

int feedback_num = 1;

//Save feedback text to a txt file
void save(string f_text) {
    ofstream savefile ("Feedback.txt");
    if (savefile.is_open())
    {
        savefile << "\nNote " << feedback_num << ": " << f_text << "\n";
        feedback_num++;
        savefile.close();
    }
    else cout << "Error opening file";
}

//Print version
void print_ver() {
    cout << "|< Version " << ver << "\n|\n|\n\|\n";
}

//Note number thing
void note(string text) {
    cout << "Note " << note_num << ": " << text << ".\n";
    note_num = note_num + 1;
}

//Print notes
void notes() {
    system("cls");
    note("Memory är inte som det ska");
    note("Ska lägga till mer räkne sätt");
    note("Jobbar på ett feedback system");

    cout << "\n\n\n";
    cout << "True mem: " << mem1 << endl;
    cout << "True mem: " << mem2 << endl;
    cout << "True mem: " << mem3 << endl;
    cout << "True mem: " << mem4 << endl;
    cout << "\n";
}

//Print memory top&bottom line depending memory slots value print different lenghts
void print_mem_line() {
    if (mem1 <= 9 && mem2 <= 9 && mem3 <= 9 && mem4 <= 9) {
        cout << "|---------|\n";
    }
    if (mem1 >= 10 && mem1 <= 99 || mem2 >= 10 && mem2 >= 99 || mem3 >= 10 && mem3 >= 99 || mem4 >= 10 && mem4 >= 99) {
        cout << "|----------|\n";
    }
    if (mem1 >= 100 && mem1 <= 999 || mem2 >= 100 && mem2 >= 999 || mem3 >= 100 && mem3 >= 999 || mem4 >= 100 && mem4 >= 999) {
        cout << "|-----------|\n";
    }
    if (mem1 >= 1000 && mem1 <= 9999 || mem2 >= 1000 && mem2 >= 9999 || mem3 >= 1000 && mem3 >= 9999 || mem4 >= 1000 && mem4 >= 9999) {
        cout << "|------------|\n";
    }
    if (mem1 >= 10000 && mem1 <= 99999 || mem2 >= 10000 && mem2 >= 99999 || mem3 >= 10000 && mem3 >= 99999 || mem4 >= 10000 && mem4 >= 99999) {
        cout << "|-------------|\n";
    }
}

//Print memory slots
void print_mem_slot(int a) {
    string slot;
    int mem;

    if (a == 1) {
        slot = "Mem1";
        mem = mem1;
    }
    if (a == 2) {
        slot = "Mem2";
        mem = mem2;
    }
    if (a == 3) {
        slot = "Mem3";
        mem = mem3;
    }
    if (a == 4) {
        slot = "Mem4";
        mem = mem4;
    }
    cout << "| " << slot << "[" << mem << "] |\n";
}

//Print all memory related stuff and version
void print_mem() {
    print_ver();
    print_mem_line();
    print_mem_slot(1);
    print_mem_slot(2);
    print_mem_slot(3);
    print_mem_slot(4);
    print_mem_line();
    cout << "|\n|\n|\n";
}

int main() {
    note_num = 1; //Reset note number variable
    system("cls");

    print_mem();

    //Print out all the options to choose from
    cout << "|< 1=Addition\n" << "|< 2=Subtraktion\n" << "|< 3=Multiplikation\n" << "|< 4=Division\n" << "|< 5=Notes\n";
    cout << "|\n|\n|\n";
    cout << "|> Input: ";
    cin >> input;

    //Show notes
    if (input == 5) {
        notes();
        system("pause");
        main();
    }
    if (input == 6) {
        cout << "Type in your feedback\n";
        getline (cin, f_input);
        save(f_input);

    }
    //If input is not any of the available options reset
    if (input > 6 || input == 0) {
        main();
    }

    system("cls");

    print_mem();

    cout << "|> Input: ";
    cin >> input1;
    if (input == 1) {
        cout << "|<        +\n";
    }
    if (input == 2) {
        cout << "|<        -\n";
    }
    if (input == 3) {
        cout << "|<        *\n";
    }
    if (input == 4) {
        cout << "|<        /\n";
    }
    cout << "|> Input: ";
    cin >> input2;

    if (input == 1) {
        sum = input1+input2;
    }
    if (input == 2) {
        sum = input1-input2;
    }
    if (input == 3) {
        sum = input1*input2;
    }
    if (input == 4) {
        sum = input1/input2;
    }

    //Print out summary
    cout << "|\n";
    cout << "|< Sum: " << sum << "\n";
    cout << "|\n|\n|\n";
    cout << "|< Save sum to memory? (1-4), (0) to return to menu.\n";
    cout << "|\n";
    cout << "|> Input: ";
    cin >> input;

    //Find out what memory slot was chosen then check if it already has a value
    if (input == 1) {
        if (mem1 > 0) {
            cout << "|< Overwrite? 1/2.\n";
            cout << "|\n";
            cout << "|> Input: ";
            cin >> input;
            if (input == 1) {
                mem1 = sum;
            }
            if (input == 2) {
                main();
            }
        }
        mem1 = sum;
    }
    if (input == 2) {
        if (mem2 > 0) {
            cout << "|< Overwrite? 1/2.\n";
            cout << "|\n";
            cout << "|> Input: ";
            cin >> input;
            if (input == 1) {
                mem2 = sum;
            }
            if (input == 2) {
                main();
            }
        }
        mem2 = sum;
    }
    if (input == 3) {
        if (mem3 > 0) {
            cout << "|< Overwrite? 1/2.\n";
            cout << "|\n";
            cout << "|> Input: ";
            cin >> input;
            if (input == 1) {
                mem3 = sum;
            }
            if (input == 2) {
                main();
            }
        }
        mem3 = sum;
    }
    if (input == 4) {
        if (mem4 > 0) {
            cout << "|< Overwrite? 1/2.\n";
            cout << "|\n";
            cout << "|> Input: ";
            cin >> input;
            if (input == 1) {
                mem4 = sum;
            }
            if (input == 2) {
                main();
            }
        }
        mem4 = sum;
    }

    main();
    return 0;
}