[C++]: Find Even Number

/*
=====================================
>                                   <
<          FIND EVEN NUMBER         >
>             by BlueX              <
<                                   >
>         [iPs]TeaM (c) 2012        <
<                                   >
=====================================
*/
#include <iostream>
#include <string>
#include <Windows.h>

using namespace std;

char isPrimaryNumber(char Input[]);
char isNumeric(char Input[]);

void SendColoredText(string str, int color);
int restart();

int main(){
    char userInput[50];

    SendColoredText("\t ============[",14),SendColoredText(" BlueX Find Even Number ",15),SendColoredText("]============\n",14);
    Sleep(1500);
    SendColoredText("Insira um numero: ", 15);
    cin.getline(userInput,50);
    cout << endl;

    if(!isNumeric(userInput)){
        SendColoredText("[",15),SendColoredText("ERRO",4);SendColoredText("]:",15),SendColoredText(" Insira apenas numeros!",15);
        restart();
    }
    if(isPrimaryNumber(userInput)){
        SendColoredText("[ ", 15),SendColoredText("PAR", 2),SendColoredText(" ] - numero: ", 15),SendColoredText(userInput, 15),cout << endl,restart();
    }
    else
        SendColoredText("[ ", 15),SendColoredText("IMPAR", 4),SendColoredText(" ] - numero: ", 15),SendColoredText(userInput, 15),cout << endl,restart();

    //system("pause");
    return 0;

}

char isNumeric(char Input[]){
    for(int i = 0, j = strlen(Input); i < j; i++)
    {
        if(Input[i] > '9' || Input[i] < '0') return 0;
    }
    return 1;
}

char isPrimaryNumber(char Input[]){
    int pos;
    pos = strlen(Input);
    if(Input[pos-1] == '0' || Input[pos-1] == '2' || Input[pos-1] == '4' || Input[pos-1] == '6' || Input[pos-1] == '8')
        return 1;
    return 0;
}

void SendColoredText(string str, int color){
    HANDLE hConsole;

    hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
    SetConsoleTextAttribute(hConsole, color);
    cout << str;
    SetConsoleTextAttribute(hConsole, 15);
}

int restart(){
    char a[2];
    int error = 0;
    if(error == 0){
        Sleep(2500);
        system("CLS");
    }
    SendColoredText("Voce deseja restar o programa?\n",15);
    SendColoredText("[N]",4),SendColoredText(" - Nao\n",15);
    SendColoredText("[S]",2),SendColoredText(" - Sim\n",15);
    SendColoredText("Opcao: ",15);
    cin.getline(a,2);
    if(a[0] == 'N' || a[0] == 'n') return 0;
    else if(a[0] == 'S' || a[0] == 's'){
        system("CLS");
        main();
    }
    else {
        SendColoredText("[",15),SendColoredText("ERRO",4);SendColoredText("]:",15),SendColoredText(" Insira apenas S ou N!",15);
        a[0] = '\1';
        restart();
    }
    return 0;
}