# C Program to Count Number of Digits in a Number

In this tutorial, i am going to show you how to count or find number of digits in a number in c program with the help of For Loop, While Loop, Functions, and Recursion.

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

Use the following steps to write a program to count number of digits in a number; as follows:

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

## All C Programs to Count Number of Digits in a Number

• C Program to Count Number of Digits in a Number using While Loop
• C Program to Count Number of Digits in a Number using For Loop
• C Program to Count Number of Digits in a Number Using Functions
• C Program to Count Number of Digits in a Number Using Recursion

### C Program to Count Number of Digits in a Number using While Loop

```/* C Program to Count Number of Digits in a Number using While Loop */
#include <stdio.h>
int main()
{
int Number, Reminder, Count=0;
printf("\n Please Enter any number :- ");
scanf("%d", &Number);
while(Number > 0)
{
Number = Number / 10;
Count = Count + 1;
}
printf("\n Number of Digits in a Given Number = %d", Count);
return 0;
}```

The result of the above c program; as follows:

```Please Enter any number :- 123456
Number of Digits in a Given Number = 6```

### C Program to Count Number of Digits in a Number using For Loop

```/* C Program to Count Number of Digits in a Number using For Loop */
#include <stdio.h>
int main()
{
int Number, Reminder, Count;
printf("\n Please Enter any number :- ");
scanf("%d", &Number);
for (Count=0; Number > 0;Number=Number/10)
{
Count=Count + 1;
}
printf("\n Number of Digits in a Given Number = %d", Count);
return 0;
}```

The result of the above c program; as follows:

```Please Enter any number :- 145698
Number of Digits in a Given Number = 6```

### C Program to Count Number of Digits in a Number Using Functions

```/* C Program to Count Number of Digits in a Number using While Loop */
#include <stdio.h>
int Count_Of_Digits (int Number)
{
int c = 0;

while(Number > 0)
{
Number = Number / 10;
c = c + 1;
}
printf("\n Number of Digits in a Given Number = %d", c);
}
int main()
{
int Number;
printf("\n Please Enter any number :- ");
scanf("%d", &Number);

Count_Of_Digits (Number);
return 0;
}```

The result of the above c program; as follows:

```Please Enter any number :- 123456789
Number of Digits in a Given Number = 9```

### C Program to Count Number of Digits in a Number Using Recursion

```/* C Program to Count Number of Digits in a Number Using Recursions */
#include <stdio.h>
int Count_Of_Digits (int);
int main()
{
int Number, Count = 0;
printf("\n Please Enter any number :- ");
scanf("%d", &Number);
Count = Count_Of_Digits (Number);
printf("\n Number of Digits in a Given Number = %d", Count);
return 0;
}
int Count_Of_Digits (int Number)
{
static int Count =0;
if(Number > 0)
{
Count = Count + 1;
Count_Of_Digits (Number / 10);
}
return Count;
}```

The result of the above c program; as follows:

```Please Enter any number :- 41236
Number of Digits in a Given Number = 5```

Categories C