C program to check whether a number is positive or negative

In this post, you will learn how to write C program to check whether a number is positive or negative. If the input number is greater than zero, then its positive else it is a negative number.

Check Positive and Negative using If Else

The given C program allows the user to enter a number and checks whether the given input is positive or negative using the If Else statement.

#include <stdio.h>

void main()
{
    int num;

    printf("Please enter a number: \n");
    scanf("%d", &num);
    if (num > 0)
        printf("%d is a positive number \n", num);
    else if (num < 0)
        printf("%d is a negative number \n", num);
    else
        printf("0 is neither positive nor negative");
}

Please enter a number:
23
23 is a positive number

Please enter a number:
-12
-12 is a negative number

Check Positive and Negative using Nested If Else

The given program allows user to enter a number and checks whether the given input is positive or negative using Nested If Else statement.

#include <stdio.h>

int main()
{
  int num;

  printf("Please enter a number:\n");
  scanf("%d",&num);

  if (num >= 0)
  {
    if (num > 0)
      printf("%d is a positive number.", num);
    else
      printf("You have entered zero value.");
  }
  else
    printf("%d is a negative number.", num);

 return 0;
}

Please enter a number:
71
71 is a positive number.

Please enter a number:
-19
-19 is a negative number.

Related Articles