Split a number into digits

Example 1

num = 12

output

2

1

Example 2

num = 123

output

3

2

1

Let’s design a logic

num = 12

First let us think, how to split the last digit 2 from the number 12.

Since the numbers are decimal (base 10), each digit’s range should be 0 to 9.

So, we can get it easy by doing modulo 10.

Like,

12 % 10 => 2 ( we have split the digit 2 from number 12)

Now, we have to split the digit 1 from number 12.

This can be achieved by dividing the number by 10 and take the modulo 10.

Like,

12 / 10 => 1

Now take modulo 10

1 % 10 = 1

Using above method, we can split each digit from a number.

Logic

Example

Let’s take num = 123

Step 1

Num = 123 (not equal to zero)

Mod = 123 % 10 ==> 3

Num = 123 / 10 ==> 12

Step 2

Num = 12 (not equal to 0)

Mod = 12 % 10 ==> 2

Num = 12 / 10 ==> 1

Step 3

Num = 1 (not equal to 0)

Mod = 1 % 10 ==> 1

Num = 1 / 10 ==> 0

Step 4

Num = 0 (equal to zero, stop the process)

Pictorial Explanation

Program

/*****************************
 *Program : split the digits *
 *Language : C               *
 *****************************/
 
#include<stdio.h>

int main()
{
    int num;
    
    scanf("%d",&num);
    
    while(num > 0) //do till num greater than  0
    {
        int mod = num % 10;  //split last digit from number
        printf("%d\n",mod); //print the digit. 
    
        num = num / 10;    //divide num by 10. num /= 10 also a valid one 
    }
    
    return 0;
}