Program to count the no of digits in a number

Counting the number of digits in a number is a common beginner-level program in C. This helps in understanding how to use loops and arithmetic operations like division.

#include <stdio.h>

int main() {
int num, count = 0;

// Input from user
printf("Enter a number: ");
scanf("%d", &num);

// Handle 0 separately
if (num == 0) {
count = 1;
} else {
while (num != 0) {
num = num / 10; // Remove the last digit
count++; // Increment digit count
}
}

printf("Number of digits: %d\n", count);

return 0;
}

OUTPUT

Enter a number: 12345
Number of digits: 5

Explanation:

• The user is asked to input a number.

• A while loop is used to divide the number by 10 repeatedly, removing one digit in each step.

• For every division, the count is incremented.

• Special handling is done for 0, which has 1 digit.