C# Program - Check whether a Number is Positive or Negative
A number is said to be positive if it is greater than zero and it is said to be negative if it is less than zero. A number can be checked for zero, positive and negative using if, if-else, nested if-else and short-hand if-else statements.
Method 1: Using If statement
In the below example, if conditional statements are used to check whether a given number is positive or negative.
using System;
class MyProgram {
static void CheckNumber(double x) {
String message = "";
if (x > 0)
{message = "Positive number";}
if (x == 0)
{message = "Zero";}
if (x < 0)
{message = "Negative number";}
Console.WriteLine(message);
}
static void Main(string[] args) {
CheckNumber(5.5);
CheckNumber(-10.8);
}
}
The above code will give the following output:
Positive number Negative number
Method 2: Using If-else statement
It can also be achieved using If-else conditional statements.
using System;
class MyProgram {
static void CheckNumber(double x) {
String message = "";
if (x > 0)
{message = "Positive number";}
else if (x == 0)
{message = "Zero";}
else
{message = "Negative number";}
Console.WriteLine(message);
}
static void Main(string[] args) {
CheckNumber(5.5);
CheckNumber(-10.8);
}
}
The above code will give the following output:
Positive number Negative number
Method 3: Using Nested If-else statement
The above problem can also be solved using nested if-else conditional statements.
using System;
class MyProgram {
static void CheckNumber(double x) {
String message = "";
if (x >= 0)
{
if (x > 0)
{message = "Positive number";}
else
{message = "Zero";}
}
else
{message = "Negative number";}
Console.WriteLine(message);
}
static void Main(string[] args) {
CheckNumber(5.5);
CheckNumber(-10.8);
}
}
The above code will give the following output:
Positive number Negative number
Method 4: Using Ternary Operator
Ternary operator can also be used here.
using System;
class MyProgram {
static void CheckNumber(double x) {
String message = "";
message = (x > 0)? "Positive number" : (x == 0)? "Zero" : "Negative number";
Console.WriteLine(message);
}
static void Main(string[] args) {
CheckNumber(5.5);
CheckNumber(-10.8);
}
}
The above code will give the following output:
Positive number Negative number
