# AMCAT Coding Questions asked in Programming Section Count Frequency of digits

### Program to count frequency of digits in an integer

/**
* C program to count frequency of digits in a given number
*/

#include <stdio.h>
#define BASE 10

int main()
{
long long num, n;
int i, lastDigit;
int freq[BASE];

printf(“Enter any number: “);
scanf(“%lld”, &num);

// Initializes frequency array with 0
for(i=0; i<BASE; i++)
{
freq[i] = 0;
}

n = num; //Copies the value of num to n

while(n != 0)
{
// Gets the last digit
lastDigit = n % 10;

// Increments the frequency array
freq[lastDigit]++;

// Removes the last digit from n
n /= 10;
}

printf(“Frequency of each digit in %lld is: n”, num);
for(i=0; i<BASE; i++)
{
printf(“Frequency of %d = %dn”, i, freq[i]);
}

return 0;
}
Output

Enter any number: 11203458760011
Frequency of each digit in 11203458760011 is:
Frequency of 0 = 3
Frequency of 1 = 4
Frequency of 2 = 1
Frequency of 3 = 1
Frequency of 4 = 1
Frequency of 5 = 1
Frequency of 6 = 1
Frequency of 7 = 1
Frequency of 8 = 1
Frequency of 9 = 0