#include <iostream>
#include <cstdlib>
#include <string>

using namespace std;

int main (void)
{
    string num = "";
    char search = '0';
    int i = 0;
    int count = 0;
    
    cout << endl << "Enter Number: ";
    cin >> num;

    cout << endl << "Enter Search Value: ";
    cin >> search;
    
    for (i = 0; i < num.length(); i++)
    {
        //cout << num[i] << endl;
        if ( num[i] == search )
        {
             count++;
        }
    }
    
    cout << endl << "Number of occurences: " << count << endl;
    
    system("PAUSE");
    return 0;
}

#include <stdio.h>
#include <stdlib.h>

int failure (char *why)
{
    fprintf (stderr, "%s\n", why);
    return 1;
} 
int main (int argc, char *argv [])
{
    int theNumber;
    int theDigit;
    int count = 0;

    // Getting and validating input
    printf ("Enter a number: ");
    if (scanf ("%d", &theNumber) != 1) return failure ("Not a number");
    theNumber = abs (theNumber);
    printf ("Enter a single digit: ");
    if (scanf ("%d", &theDigit) != 1) return failure ("Not a number");
    theDigit = abs (theDigit);
    if (theDigit > 9) return failure ("Too many digits"); 

    // Counting digits
    while (theNumber)
    {
        if ((theNumber % 10) == theDigit) count++;
        theNumber /= 10;
    }

    // Presenting results
    printf ("The digit %d occurs %d times\n", theDigit, count);
    rewind (stdin);
    getchar ();
    return 0;
}