## INDEX

### C program to print Armstrong numbers from 1 to 500

C program to print Armstrong numbers from 1 to 500

#include<stdio.h>
int main(){
int num,r,sum,temp;

for(num=1;num<=500;num++){
temp=num;
sum = 0;

while(temp!=0){
r=temp%10;
temp=temp/10;
sum=sum+(r*r*r);
}
if(sum==num)
printf("%d ",num);
}

return 0;
}

Output:
1 153 370 371 407

Algorithm:

Definition according to c programming point of view:
Those numbers which sum of the cube of its digits is equal to that number are known as Armstrong numbers. For example 153 since 1^3 + 5^3 + 3^3 = 1+ 125 + 9 =153
Other Armstrong numbers: 370,371,407 etc.
In general definition:
Those numbers which sum of its digits to power of number of its digits is equal to that number are known as Armstrong numbers.
Example 1: 153
Total digits in 153 is 3
And 1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153
Example 2: 1634
Total digits in 1634 is 4
And 1^4 + 6^4 + 3^4 +4^4 = 1 + 1296 + 81 + 64 =1634

Examples of Armstrong numbers: 1, 2, 3, 4, 5, 6, 7, 8, 9, 153, 370, 371, 407, 1634, 8208, 9474, 54748, 92727, 93084, 548834, 1741725