Q:

Armstrong Number in C

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robaa
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2022-11-13
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Before going to write the c program to check whether the number is Armstrong or not, let's understand what is Armstrong number.

Armstrong number is a number that is equal to the sum of cubes of its digits. For example 0, 1, 153, 370, 371 and 407 are the Armstrong numbers.

Write a c program to check armstrong number.

Input: 153

Output: armstrong

Input: 22

Output: not armstrong

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robaa
2022-11-13
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Let's try to understand why 153 is an Armstrong number.

 

153 = (1*1*1)+(5*5*5)+(3*3*3)  

where:  

(1*1*1)=1  

(5*5*5)=125  

(3*3*3)=27  

So:  

1+125+27=153  

Let's try to understand why 371 is an Armstrong number.

 

371 = (3*3*3)+(7*7*7)+(1*1*1)  

where:  

(3*3*3)=27  

(7*7*7)=343  

(1*1*1)=1  

So:  

27+343+1=371  

Let's see the c program to check Armstrong Number in C.

#include<stdio.h>  
 int main()    
{    
int n,r,sum=0,temp;    
printf("enter the number=");    
scanf("%d",&n);    
temp=n;    
while(n>0)    
{    
r=n%10;    
sum=sum+(r*r*r);    
n=n/10;    
}    
if(temp==sum)    
printf("armstrong  number ");    
else    
printf("not armstrong number");    
return 0;  
}

Output:

enter the number=153
armstrong number

enter the number=5
not armstrong number

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