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How to check if a number is positive, negative, or zero in Java
okwudili onyejiaku
Overview
We can check if a value is positive, negative, or zero in Java using the conditional statements if else and else if. The logic is to check first if the number is greater than 0 (positive). The second condition is to check if it is less than zero (negative). The last condition is to say that it is a zero because none of the other conditions are true.
Syntax
if(number > 0)
// number is positive
else if(number < 0)
// number is negative
else
// number is equal to zeroSyntax for checking if a number is positive, negative or zero in Java
Parameters
number: This is the number we want to check to see if it is positive, negative, or zero.
Example
class HelloWorld {
static void checkNumber(int num){
//check if number is positive, negative or zero
if(num>0)
System.out.println(num + " is POSITIVE NUMBER.");
else if(num<0)
System.out.println(num + " is NEGATIVE NUMBER.");
else
System.out.println(num + " is a ZERO.");
}
public static void main( String args[] ) {
// create some number values
int no1 = 20;
int no2 = 0;
int no3 = -100;
int no4 = 4 * -1;
// invoke function
checkNumber(no1);
checkNumber(no2);
checkNumber(no3);
checkNumber(no4);
}
}Check if a number is positive, negative, or zero in Java
Explanation
- Line 2: We create a method called
checkNumber()which takes a number as a parameter, checks if it is positive, negative, or zero, then tells us what it is. - Lines 13–16: We create some integer values that we want to check to see if they are positive, negative, or zero.
- Lines 19–22: With the
checkNumber()method we created, we use it to check if the numbers we created are positive, negative, or zero. Then we print the results to the console.
RELATED TAGS
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negative
java
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okwudili onyejiaku
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