Check the number is a happy number

8. Write a program to find the number is a happy number?
#include
#include
void main()
{
int a,r1,r2,b,x,r3,r4;
clrscr();
printf("enter the number");
scanf("%d",&a);
x=a;
r1=a%10;
r2=a%100;
r3=(r2-r1)/10;
r4=(a-r2)/100;
b=(r1*r1*r1)+(r3*r3*r3)+(r4*r4*r4);
if(b==x)
printf("happy number");
else
printf("not");
getch();
}

Algorithum
1.start
2.read a
3.calculate
r1=a%10
r2=a%100
r3=(r2-r1)/10
r4=(a-r2)/100

b=r1³+r3³+r4³

5.if b=x

6.print happy no

7.else

8.print not

9.stop

Result

The program is sucessfully excecuted and desired output is obtained.

Output

enter the no.

153

happy no