assigning $input value to a variable $a if the input number is 1 then return 1 as result if the input number is 0 then return 0 as result Suppose the user has entered 16 then we can find the square root of the 16 and expect the result as 4, if the user entered 49 we can expect the result as 7 and so on.Īlso, we have used the built-in mathematical function sqrt() to find the square root.įinding Square Root of A Number without Using Built-in sqrt() Function: In the following program, we have created a program in PHP to calculate the square root of a number without using built-in sqrt() function. sqrt(-16) įinding Square Root of A Number Entered by The User Through a Form: In the following program, we have created a program in PHP to calculate the square root of a number entered by the user through a form. example to calculate the sixth root of 88Įcho ''.'Result of : pow(88, 1/6) = '. example to calculate the fifth root of 76Įcho ''.'Result of : pow(76, 1/5) = '. example to calculate the fourth root of 12Įcho ''.'Result of : pow(12, 1/4) = '. example to calculate the cube root of 27Įcho ''.'Result of : pow(27, 1/3) = '. To calculate any root of the given number we use pow() function which stands for power. Similar to the sqrt function, which calculates the square root of the given number. While calculating the square root of 7, we see that after the decimal many digits are found, the number of digits after the decimal depends upon the user. In the above program, the output is 4 as we know 4*4 is 16 thus the square root of 16 is 4. We will also learn to find the square root with different types of input. If the input number is 49, the square root number will be 7 and so on. If the input number is 81, the square root of the number will be 9. The square root of a given number is as per the following,

Also, remember the square root of zero is zero. The positive numbers return positive numbers as output and negative numbers return NAN (Not a Number) as output, the square root of decimal numbers is a float as output, and the square root of one is one. Here we will see that the input numbers can be positive or negative numbers or decimal numbers (float) or it can also be zero.

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