Given a number we have to find the sum of digit of number .

so what is **sum of digits**?

for example- number like 25 the sum of digit is 2+5=7

**Example**:

```
input:19
output:10
input:98
output:17
```

**Logic:**

`main logic behind this question is to just find all the digit of a number and add them all .`

#include<iostream> using namespace std; int main() { int num; cout<<"Enter a number : "<<endl; cin>>num; int sum=0; while(num>0) { int rem=num%10; sum+=rem; num=num/10; } cout<<"sum of digit is "<<sum<<endl; }

Output:

Enter a number : 14 sum of digit is 5

**Time Complexity**:O(N)

**Space Complexity**:O(1)