# Program to Check for Perfect Square in C

## Check for Perfect Square in C

Today in this article we will discuss the program to check for perfect square in C programming language. We are given with an integer number and need to print “True” if it is, otherwise “False”.
A perfect square is a number that can be expressed as the product of an integer by itself or as the second exponent of an integer.

## Method 1:

• Declare a variable x and set sr = sqrt(x)
• Multiply the square root twice.
• if(sr*sr==x) return true.
• Otherwise return false.

### Method 1 :Code in C

Run
```#include <stdio.h>
#include <math.h>

int isPerfectSquare(long double x)
{
if (x >= 0) {

long long sr = sqrt(x);
return (sr * sr == x);
}

return 0;
}

int main()
{
long long x = 84;
if (isPerfectSquare(x)==1)
printf("True");
else
printf("False");
return 0;
}
```

`False`

## Method 2 :

• In this method we use the floor and ceil function .
• If they are equal that implies the number is a perfect square.

### Method 2 :Code in C

Run
```#include <stdio.h>
#include <math.h>

void checkperfectsquare(int n)
{
if (ceil((double)sqrt(n)) == floor((double)sqrt(n))) {
printf("True");
}
else {
printf("False");
}
}

int main()
{

int n = 49;
checkperfectsquare(n);
return 0;
}
```

`True`