C Exercises: Find the Armstrong number for a given range of number

C For Loop: Exercise-30 with Solution

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

Sample Solution:

C Code:

/* 
   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. Sum of its divisor is 13 + 53 + 33 = 1 + 125 + 27 = 153
*/
#include <stdio.h> // Include the standard input/output header file.

int main() {
    int num, r, sum, temp; // Declare variables for the input number, remainder, sum, and a temporary variable.
    int stno, enno; // Declare variables for the starting and ending range.

    // Prompt the user to input the starting range.
    printf("Input starting number of range: ");
    scanf("%d", &stno); // Read the starting range from the user.

    // Prompt the user to input the ending range.
    printf("Input ending number of range : ");
    scanf("%d", &enno); // Read the ending range from the user.

    // Print a message indicating that Armstrong numbers will be displayed.
    printf("Armstrong numbers in the given range are: ");

    // Start a loop to iterate through the numbers in the specified range.
    for (num = stno; num <= enno; num++) {
        temp = num; // Set 'temp' to the current number for manipulation.
        sum = 0; // Initialize 'sum' to zero.

        // Start a loop to extract digits from 'temp'.
        while (temp != 0) {
            r = temp % 10; // Get the last digit of 'temp'.
            temp = temp / 10; // Remove the last digit from 'temp'.
            sum = sum + (r * r * r); // Calculate the sum of cubes of each digit.
        }

        // If the sum of cubes of digits is equal to the original number, print the number as an Armstrong number.
        if (sum == num)
            printf("%d ", num);
    }

    // Print a newline to separate the output.
    printf("\n");

    return 0; // Return 0 to indicate successful execution.
}

Sample Output:

Input starting number of range: 1                                                                             
Input ending number of range : 1000                                                                           
Armstrong numbers in given range are: 1 153 370 371 407

Flowchart:

C Programming Code Editor:

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