C Program to Find Product of Digits of a Number

In this C program, we will find the product of digits of a number using while loop. To multiply digits of a number we have to remove one digit at a time, we can use '/' division and '%' modulus operator.

Number%10 will give the least significant digit of the number, we will use it to get one digit of number at a time. To remove last least significant digit from number we will divide number by 10.

Product of digits of 2534 = 2 x 5 x 3 x 4 = 120

Required Knowledge

Algorithm to find product of digits of a number
• Get least significant digit of number (number%10) and multiply it to the product variable.
• Remove least significant digit form number (number = number/10).
• Repeat above two steps, till number is not equal to zero.

C program to find sum of all even numbers between 1 to N using for loop

```#include <stdio.h>

int main() {
int num, temp;
long productOfDigit = 1;

printf("Enter a Number\n");
scanf("%d", &num);
temp = num;

while(num != 0){
productOfDigit *= num % 10;
num = num/10;
}

printf("Product of digits = %ld", temp, productOfDigit);

return 0;
}
```
Output
```Enter a Number
2436
Product of digits = 144
```
```Enter a Number
2222
Product of digits of 2436 = 16
```

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