## Q. C Program to Count the Number of Digits in a Number.

Here you will find an algorithm and program in C programming language to count number of digits in a number. First let us understand this.

Explanation : Suppose an input number is given as 12341 then the output will be 5 as there are 5 digits in the given number and digits are 1, 2, 3, 4, 1.

## Algorithm to count the number of digits in a given number

```START
step 1 : Declare/Read a number and store it in some variable say num.
step 2 : Initialize another variable to store total digits say count = 0.
step 3 : If num != 0 then increment count by 1 i.e. count++.
step 4 : Divide num by 10 to remove last digit of the given number i.e. num = num / 10.
step 5 : Repeat step 3 to 4 till num > 0 or num != 0.
STOP
```

# C Program to Count Number of Digits in a Number

```#include <stdio.h>
int count_digit(long long num)
{
int count = 0;
while (num != 0) {
num = num / 10;
++count;
}
return count;
}

int main(void)
{
long long num = 874512369;
printf("Number of digits : %d", count_digit(num));
return 0;
}

```

#### Output

```Number of digits : 9
```