#include <stdio.h>    
    #include <stdlib.h>
    int main ()
    {
        char s[] = "365.24 29.53";
        char* p;
        double d1, d2;
        d1 = strtod (s, &p);
        d2 = strtod (p, NULL);
        printf ("%.2f\n", d1/d2);
        return 0;
    }

    #include <stdio.h>
    #include <stdlib.h>
    int compareints (const void * a, const void * b)
    {
        return ( *(int*)a - *(int*)b );
    }
    int values[] = { 50, 20, 60, 40, 10, 30 };
    int main ()
    {
        int * p;
        int key = 40;
        qsort(values, 6, sizeof (int), compareints);
        p = (int*) bsearch (&key, values, 6, sizeof (int), compareints);
        if (p != NULL)
        printf ("%d\n",*p);
        return 0;
    }

    #include <stdio.h>    
    #include <stdlib.h>   
    int main ()
    {
        int n, m;
        n = abs(23);
        m = abs(-11);
        printf ("%d", n);
        printf ("%d", m);
        return 0;
    }

    #include <stdio.h>
    #include <math.h>
    int main ()
    {
        printf ("The value of -3.1416 is %lf\n", fabs (-3.1416));
        return 0;
    }

    #include <stdio.h>
    #include <stdlib.h>
    int main ()
    {
        div_t divresult;
 
        divresult = div (38, 5);
        printf ("%d\n", divresult.rem);
        return 0;
    }