How do you check whether a number is a happy number or not?

To find whether a given number is happy or not, calculate the square of each digit present in number and add it to a variable sum. If resulting sum is equal to 1 then, given number is a happy number.

What is a happy number in C?

A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number either equals 1 (where it will stay), or it loops endlessly in a cycle that does not include 1.

How do you find a number is perfect or not in C?

Any number can be the perfect number in C if the sum of its positive divisors excluding the number itself is equal to that number. For example, 6 is a perfect number in C because 6 is divisible by 1, 2, 3, and 6. So, the sum of these values is 1+2+3 = 6 (Remember, we have to exclude the number itself.

What is a happy number example?

For example, starting with 7 gives the sequence 7, 49, 97, 130, 10, 1, so 7 is a happy number. The first few happy numbers are 1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100, (OEIS A007770).

What is magic number in C programming?

In this section, we will discuss magic numbers in C programming language along with their various examples. When the sum of all the given digits of a number and the reverse of that sum is multiplied, which is equal to the original number, and then the number is called a magic number.

How do you write a perfect number Program?

1. Program 1. #include int main(){ int n,i=1,sum=0; printf(“Enter a number: “); scanf(“\%d”,&n);
2. Result. Enter a number: 6 6 is a perfect number.
3. Program 2. C program to print perfect numbers from 1 to 100. int main(){ int n,i,sum; printf(“Perfect numbers are: “); for(n=1;n<=100;n++){
4. Result. Perfect numbers are: 6 28.

How do you check a number is a perfect number?

In number theory, a perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. For instance, 6 has divisors 1, 2 and 3 (excluding itself), and 1 + 2 + 3 = 6, so 6 is a perfect number.

Is 68 a happy number?

As a decimal number, 68 is the last two-digit number to appear for the first time in the digits of pi. It is a happy number, meaning that repeatedly summing the squares of its digits eventually leads to 1: 68 → 62 + 82 = 100 → 12 + 02 + 02 = 1.