Check whether given floating point number is even or odd

Given a floating point number, check whether it is even or odd.

We can check whether a integer is even or odd by dividing its last digit by 2. But in case of floating point number we can’t check a given number is even or odd by just dividing its last digit by 2. For example, 100.70 is an odd number but its last digit is divisible by 2.

Examples :

Input : 100.7
Output : odd

Input : 98.8
Output : even

Input : 100.70
Output : odd
Trailing 0s after dot do not matter.

Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach :

• We start traversing a number from its LSB until we get a non-zero digit or ‘.’
• If the number is divisible by 2 it is even else odd
• If it is ‘.’ than it means decimal part of number is traversed and now we can check number is even or odd by dividing number by 2 whether it is 0 or non zero digit.

Below is the implementation of above approach :

C++

 // CPP program to check whether given floating // point number is even or odd #include using namespace std;    // Function to check even or odd. bool isEven(string s) {     int l = s.length();        // Loop to traverse number from LSB     bool dotSeen = false;     for (int i = l - 1; i >= 0; i--) {            // We ignore trailing 0s after dot         if (s[i] == '0' && dotSeen == false)             continue;            // If it is '.' we will check next digit and it         // means decimal part is traversed.         if (s[i] == '.') {             dotSeen = true;             continue;         }            // If digit is divisible by 2         // means even number.         if ((s[i] - '0') % 2 == 0)             return true;            return false;     } }    // Driver Function int main() {     string s = "100.70";     if (isEven(s))         cout << "Even";     else         cout << "Odd";     return 0; }

Java

 // Java program to check whether given floating // point number is even or odd import java.util.*; import java.lang.*;    public class GfG {        // Function to check even or odd.     public static boolean isEven(String s1)     {         int l = s1.length();         char[] s = s1.toCharArray();            // Loop to traverse number from LSB         boolean dotSeen = false;         for (int i = l - 1; i >= 0; i--) {                // We ignore trailing 0s after dot             if (s[i] == '0' && dotSeen == false)                 continue;                // If it is '.' we will check next digit and it             // means decimal part is traversed.             if (s[i] == '.') {                 dotSeen = true;                 continue;             }                // If digit is divisible by 2             // means even number.             if ((s[i] - '0') % 2 == 0)                 return true;                return false;         }            return false;     }        // Driver function     public static void main(String argc[])     {         String s = "100.70";         if (isEven(s))             System.out.println("Even");         else             System.out.println("Odd");     } } /* This code is contributed by Sagar Shukla */

Python3

 # Python 3 program to check # whether given floating # point number is even or odd       # Function to check # even or odd. def isEven(s) :        l = len(s)         # Loop to traverse     # number from LSB     dotSeen = False     for i in range(l - 1, -1, -1 ) :                    # We ignore trailing         # 0s after dot         if (s[i] == '0'            and dotSeen == False) :              continue             # If it is '.' we will         # check next digit and it         # means decimal part is         # traversed.         if (s[i] == '.') :             dotSeen = True               continue                    # If digit is          # divisible by 2         # means even number.         if ((int)(s[i]) % 2 == 0) :               return True                         return False                 # Driver Function s = "100.70" if (isEven(s)) :     print("Even") else :     print("Odd")        # This code is contributed # by Nikita Tiwari.

C#

 // C# program to check whether given floating // point number is even or odd using System;    public class GfG {        // Function to check even or odd.     public static bool isEven(string s1)     {         int l = s1.Length;            // char[] s = s1.toCharArray();            // Loop to traverse number from LSB         bool dotSeen = false;         for (int i = l - 1; i >= 0; i--) {                // We ignore trailing 0s after dot             if (s1[i] == '0' && dotSeen == false)                 continue;                // If it is '.' we will check next             // digit and it means decimal part             // is traversed.             if (s1[i] == '.') {                 dotSeen = true;                 continue;             }                // If digit is divisible by 2             // means even number.             if ((s1[i] - '0') % 2 == 0)                 return true;                return false;         }            return false;     }        // Driver function     public static void Main()     {         string s1 = "100.70";            if (isEven(s1))             Console.WriteLine("Even");         else             Console.WriteLine("Odd");     } }    /* This code is contributed by Vt_m */

PHP

 = 0; \$i--)      {            // We ignore trailing          // 0s after dot         if (\$s[\$i] == '0' && \$dotSeen == false)         continue;            // If it is '.' we will          // check next digit and it         // means decimal part is         // traversed.         if (\$s[\$i] == '.')         {             \$dotSeen = true;             continue;         }            // If digit is divisible by 2         // means even number.         if ((\$s[\$i] - '0') % 2 == 0)              return true;                        return false;          } }        // Driver Code     \$s = "100.70";     if (isEven(\$s))     echo "Even";     else     echo "Odd";    // This code is contributed by aj_36 ?>

Output :

odd

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