69. Sqrt(x)

Description

Implement int sqrt(int x).

Compute and return the square root of x, where x is guaranteed to be a non-negative integer.

Since the return type is an integer, the decimal digits are truncated and only the integer part of the result is returned.

Example 1:

Input: 4
Output: 2
Example 2:

Input: 8
Output: 2
Explanation: The square root of 8 is 2.82842..., and since
the decimal part is truncated, 2 is returned.

Answer

package main

import "fmt"

func mySqrt(x int) int {
    var index int
    for i := 1; i <= x; i++ {
        if i*i >= x {
            if i*i == x {
                index = i
            } else {
                index = i - 1
            }
            break
        }
    }
    return index
}

func main() {
    fmt.Println(mySqrt(1))
}