I'm trying to create two functions. The first function accepts integer inputs from the user until they are between 0 and 100. The seconds function display the validation to the stdOut.
However, it keeps giving me an error saying "Expected expression" when I call the function.

```
#include <stdio.h>
    // function prototype for the function input
    int input(int);
    // function prototype for the function validate
    int validate(int);

    //main function
    int main(void)
    {

        //calling the function input
        input(int x)
        //calling the function validate
        validate(int y)

        return 0;

    }

    // Function definition for input
    int input(int a)
    {
        int r;
        printf("Enter the int value of r\n");
        scanf("%d",&r);
    }

    // Function definition for validate
    int validate(int b)
    {
        int r;

        if(r>= 0 && r<= 100)
            printf("Valid number");
        else
            printf("Invalid");
    }

```