# C Program to Check Whether a Number is Positive or Negative

#### In this example, you will learn to check whether a number (entered by the user) is negative or positive.

This program takes a number from the user and checks whether that number is either positive or negative or zero.

## Check Positive or Negative Using if…else

#include <stdio.h>
int main(){
double num;
printf("Enter a number: ");
scanf("%lf", &num);
if (num <= 0.0) {
if (num == 0.0)
printf("You entered 0.");
else
printf("You entered a negative number.");
} else
printf("You entered a positive number.");
return 0;
}

You can also solve this problem using nested if else statement.

## Check Positive or Negative Using Nested if…else

#include <stdio.h>
int main(){
double num;
printf("Enter a number: ");
scanf("%lf", &num);

if (num < 0.0)
printf("You entered a negative number.");
else if (num > 0.0)
printf("You entered a positive number.");
else
printf("You entered 0.");

return 0;
}

Output 1

Enter a number: 12.3
You entered a positive number.

Output 2

Enter a number: 0
You entered 0.

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