#include <stdio.h>
#include <stdlib.h>


int isIncluded(int x, int a, int b);


int main()
{
    int IsIncluded = isIncluded(2, 3, 6);

    if (IsIncluded == 1)
    {
        puts("X is included in [a, b]");
    }
    else
    {
        puts("X is not included in [a, b]");
    }

    system("pause");

    return 0;
}

int isIncluded(int x, int a, int b)
{
    if ( (x <= b) && (x >= a))
    {
        return 1;
    }
    else
    {
        return 0;
    }
}