# C Exercises: Find the happy numbers between 1 to 1000

## C Numbers: Exercise-14 with Solution

Write a program in C to find the happy numbers between 1 and 1000.

**Sample Solution**:

**C Code:**

```
# include <stdio.h>
# include <math.h>
# include <stdlib.h>
# include <stdbool.h>
int SumOfSquNum(int givno)
{
int SumOfSqr = 0;
while (givno)
{
SumOfSqr += (givno % 10) * (givno % 10);
givno /= 10;
}
return SumOfSqr;
}
bool checkHappy(int chkhn)
{
int slno, fstno;
slno = fstno = chkhn;
do
{
slno = SumOfSquNum(slno);
fstno = SumOfSquNum(SumOfSquNum(fstno));
}
while (slno != fstno);
return (slno == 1);
}
int main()
{
int j,ctr;
printf("\n\n Find the Happy numbers between 1 to 1000: \n");
printf(" ----------------------------------------------\n");
printf(" The happy numbers between 1 to 1000 are: ");
for (j=1;j<=1000;j++)
{
if (checkHappy(j))
printf("%d ",j);
}
printf("\n");
}
```

Sample Output:

The happy numbers between 1 to 1000 are: 1 7 10 13 19 23 28 31 32 44 49.....

**Pictorial Presentation: **

**Flowchart: **

**C Programming Code Editor:**

** Contribute your code and comments through Disqus.**

**Previous:** Write a program in C to check a number is a Happy or not.

**Next:** Write a program in C to check whether a number is Disarium or not.

**What is the difficulty level of this exercise?**

Test your Programming skills with w3resource's quiz.

## C Programming: Tips of the Day

** What does (x ^ 0x1) != 0 mean?**

The XOR operation (x ^ 0x1) inverts bit 0. So the expression effectively means: if bit 0 of x is 0, or any other bit of x is 1, then the expression is true.

Conversely the expression is false if x == 1.

So the test is the same as:

if (x != 1)

and is therefore (arguably) unnecessarily obfuscated.

Ref :https://bit.ly/2NIisQM

**Weekly Trends**- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join
- JavaScript functions Exercises
- Python Tutorial
- Python Array Exercises
- SQL Cross Join
- C# Sharp Array Exercises

We are closing our Disqus commenting system for some maintenanace issues. You may write to us at reach[at]yahoo[dot]com or visit us at Facebook