C++ Program to Print Armstrong Number between 1 to 1000

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This C++ program prints all the armstrong numbers upto 1000. Armstrong numbers are those numbers whose value is equal to the sum of digits of the number to their third power. The nested loop are used for this purpose, where index of each loop is used as one digit of the number.

The number is computed using these indices inside the innermost loop and the is compared with the value obtained by raising each digit of the number to its third power and summing it. If these values are equal, the number is an armstrong number and is printed on the standard output.

Here is the source code of the C++ program prints all the armstrong numbers upto 1000. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

  1. /*
  2.  * C++ Program to Print all the Armstrong Numbers
  3.  */ 
  4. #include <iostream>
  5. #include <cmath>
  6.  
  7. int main()  
  8. {
  9.     int sum, val;
  10.  
  11.     std::cout << "Armstrong numbers => ";
  12.     for(int i = 0; i < 10; i++)
  13.     {
  14.         for(int j = 0; j < 10; j++)
  15.         {
  16.             for(int k = 0; k < 10; k++)
  17.             {
  18.                 val = i * 100 + j * 10 + k;
  19.                 sum = pow(i, 3) + pow(j, 3) + pow(k, 3);
  20.                 if(val == sum)
  21.                     std::cout << val << "  ";
  22.             }
  23.         }
  24.     }
  25.     std::cout << std::endl;
  26. }

$ a.out
Armstrong numbers => 0  1  153  370  371  407

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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