# 77 : C Program to find entered number is an armstrong number

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An Armstrong number is that 3 digit number whose sum of the cubes of each digits is equal to the number itself.

Lets see an example :

407 = 4x4x4 + 0x0x0 + 7x7x7 = 407

153 = 1x1x1 + 5x5x5 + 3x3x3 = 153

Logic :
```
//Armstrong number logic
while(temp_number >=1 ) {

temp_var = temp_number%10; //get unit place digit
power_of_digit = temp_var*temp_var*temp_var; //find the power
sum = sum + power_of_digit; //add to sum
temp_number = temp_number/10; //remove the last digit

}

```

``````
/*
* 1000+ C programs + tutorials
*
*
* 77_c_program_to_find_in_entered_number_is_armstrong.c
*
*
*
*  Created on: Oct 25, 2014
*  Author: Code2care.org
*/

#include
//#include

void main() {

int number,temp_number,temp_var,sum,power_of_digit;

//clrscr();

printf("\n Enter a 3 digit number : ");
scanf("%d",&number);

temp_number = number;

while(temp_number >=1 ) {

temp_var = temp_number%10; //get unit place digit
power_of_digit = temp_var*temp_var*temp_var; //find the power
sum = sum + power_of_digit; //add to sum
temp_number = temp_number/10; //remove the last digit

}

if(sum == number) {

printf("\n Entered number %d is a Armstrong Number", number);
}
else {

printf("\n Entered number %d is not Armstrong Number", number);
}

//getch();

}
```

```

• Output :

``` Enter a 3 digit number : 123
Entered number 123 is not Armstrong Number

Enter a 3 digit number : 370
Entered number 370 Armstrong Number

Enter a 3 digit number : 407
Entered number 407 Armstrong Number

Enter a 3 digit number : 371
Entered number 371 Armstrong Number

```

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