# C Exercises: Check whether a given number is an armstrong number or not

## C For Loop: Exercise-29 with Solution

Write a C program to check whether a given number is an Armstrong number or not.

When the sum of the cube of the individual digits of a number is equal to that number, the number is called Armstrong number. For Example 153 is an Armstrong number because 153 = 1^{3}+5^{3}+3^{3}.

Test Data :

Input a number: 153

Expected Output :

153 is an Armstrong number.

**Visual Presentation:**

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**Sample Solution:**

**C Code:**

```
#include <stdio.h> // Include the standard input/output header file.
int main() {
int num, r, sum = 0, temp; // Declare variables for the input number, remainder, sum, and a temporary variable.
printf("Input a number: "); // Prompt the user to input a number.
scanf("%d", &num); // Read the number from the user.
temp = num; // Save the original number in a temporary variable.
while (num != 0) { // Start a loop to extract digits from the number.
r = num % 10; // Get the last digit of the number.
sum = sum + (r * r * r); // Calculate the sum of cubes of each digit.
num = num / 10; // Move to the next digit.
}
if (sum == temp) // If the sum of cubes of digits is equal to the original number.
printf("%d is an Armstrong number.\n", temp); // Print that it's an Armstrong number.
else
printf("%d is not an Armstrong number.\n", temp); // Otherwise, print that it's not an Armstrong number.
return 0; // Return 0 to indicate successful execution.
}
```

Sample Output:

Input a number: 153 153 is an Armstrong number.

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**Previous:** Write a c program to find the perfect numbers within a given number of range.

**Next:** Write a C program to find the Armstrong number for a given range of number.

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