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C Exercises: Check whether a number is positive or negative

C Conditional Statement: Exercise-3 with Solution

Write a C program to check whether a given number is positive or negative.

Pictorial Presentation:

Check whether a number is positive or negative

Sample Solution:

C Code:

#include <stdio.h>
void main()
{
    int num;
 
    printf("Input a number :");
    scanf("%d", &num);
    if (num >= 0)
        printf("%d is a positive number \n", num);
    else
        printf("%d is a negative number \n", num);
}

Sample Output:

Input a number :15                                                                                            
15 is a positive number  

Flowchart:

Flowchart: Check whether a number is positive or negative

C Programming Code Editor:

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C Programming: Tips of the Day

Why do C and C++ compilers allow array lengths in function signatures when they're never enforced?

It is a quirk of the syntax for passing arrays to functions.

Actually it is not possible to pass an array in C. If you write syntax that looks like it should pass the array, what actually happens is that a pointer to the first element of the array is passed instead.

Since the pointer does not include any length information, the contents of your [] in the function formal parameter list are actually ignored.

Ref : https://bit.ly/3fhlvdH