## Pages

### write a c program to check given number is strong number or not | CTechnotips

Definition of strong number:

A number is called strong number if sum of the factorial of its digit is equal to number itself. For example: 145 since
1! + 4! + 5! = 1 + 24 + 120 = 145

Code 1:

1. Write a c program to check whether a number is strong or not
#include<stdio.h>
int main(){
int num,i,f,r,sum=0,temp;
printf("Enter a number: ");
scanf("%d",&num);

temp=num;
while(num){
i=1,f=1;
r=num%10;
while(i<=r){
f=f*i;
i++;
}
sum=sum+f;
num=num/10;
}
if(sum==temp)
printf("%d is a strong number",temp);
else
printf("%d is not a strong number",temp);
return 0;
}
Sample output:
Enter a number: 145
145 is a strong number

Code 2:

1. C program for strong number
2. Strong number program in c
#include<stdio.h>
int main(){
int num,i,f,r,sum,temp;
int min,max;
printf("Enter minimum range: ");
scanf("%d",&min);
printf("Enter maximum range: ");
scanf("%d",&max);
printf("Strong numbers in given range are: ");
for(num=min; num <= max; num++){
temp = num;
sum=0;
while(temp){
i=1;
f=1;
r=temp%10;
while(i<=r){
f=f*i;
i++;
}
sum=sum+f;
temp=temp/10;
}

if(sum==num)
printf("%d ",num);
}
return 0;
}
Sample output:
Enter minimum range: 100
Enter maximum range: 100000
Strong numbers in given range are: 145 40585