Base Conversion || main.cpp

// Use this program to convert numbers of one base to another base.
// For example, decimal to hexadecimal, or binary to base 36 (0-Z).
// Base can be anything between 2 and 36.
// Convert.cpp https://pastebin.com/c6HBu4rp
// Convert.h https://pastebin.com/39AvSGaj

#include <cstdio>
#include <iostream>
#include <string>
#include "Convert.h"

using namespace std;

void invalidInput();
void checkValue(string &input, int base);
void checkBase(int &base);

int main(){
    Convert convert;
    string initNum;
    string newNum;
    int initBase;
    int newBase;
    int bufferNum;

    printf("Enter initial base (2-36): ");
    checkBase(initBase);
    printf("\nValid numbers: %s\n", convert.getBase(initBase).c_str());
    printf("Enter initial number: ");
    checkValue(initNum, initBase);
    printf("\nEnter new base (2-36): ");
    checkBase(newBase);

    printf("\nBase %d: %s\n", initBase, initNum.c_str());
    if(newBase != initBase){
        bufferNum = convert.tonumber(initNum, initBase);
        printf("Base 10: %d\n", bufferNum);
        if(newBase != 10){
            newNum = convert.tobase(bufferNum, newBase);
            printf("Base: %d: %s\n", newBase, newNum.c_str());
        }
    }

    system("PAUSE");
    return 0;
}

void invalidInput(){
    printf("Invalid input. Try again: ");
    cin.clear();
    cin.ignore(10000, '\n');
}

bool checkBase(string input, int base){
    for(int i = 0; i < input.length(); i++){
        bool isBase = false;
        for(int b = 0; b < base; b++){
            if(input[i] == Convert().getBase(base)[b]){
                isBase = true;
                break;
            }
        }
        if(!isBase){
            return false;
        }
    }
    return true;
}

void checkValue(string &input, int base){
    while(!(cin >> input && checkBase(input, base))){
        invalidInput();
    }
}

void checkBase(int &base){
    while(!(cin >> base && base > 1 && base < 37)){
        invalidInput();
    }
}