Project 3: Sum of Digits

Add Up Every Digit

Loops are powerful — use them here to repeatedly peel off and sum each digit of a number until nothing is left.

YOUR TASK

Write a C program that:

Reads a positive integer from the user
Calculates the sum of all its digits using a loop
Prints the result in the format Sum: X

Need a hint?

Step-by-step:
1. Declare int n, sum = 0;
2. Read with scanf("%d", &n);
3. Loop: while (n != 0)
4. Inside the loop: sum += n % 10; then n /= 10;
5. After the loop: printf("Sum: %d\n", sum);

Example (input: 1234):

Enter number: 1234
Sum: 10

Example (input: 987):

Enter number: 987
Sum: 24

Language:

Input:

Code Editor Ready

Output

Console

Console initialized...
Ready for Project 3: Sum of Digits

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