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Tuesday, May 13, 2014

C program to generate and print armstrong numbers

This program prints armstrong number. In our program we ask the user to enter a number and then we use a loop from one to the entered number and check if it is an armstrong number and if it is then the number is printed on the screen. Remember a number is armstrong if the sum of cubes of individual digits of a number is equal to the number itself. For example 371 is an armstrong number as 33 + 73 + 13 = 371. Some other armstrong numbers are 0, 1, 153, 370, 407.

C programming code

#include <stdio.h>
void main()
   int r;
   long number = 0, c, sum = 0, temp;
   printf("Enter an integer upto which you want to find armstrong numbers\n");
   printf("Following armstrong numbers are found from 1 to %ld\n",number);
   for( c = 1 ; c <= number ; c++ )
      temp = c;
      while( temp != 0 )
         r = temp%10;
         sum = sum + r*r*r;
         temp = temp/10;
      if ( c == sum )
         printf("%ld\n", c);
         sum = 0;

Output of the program...

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