/*

                      MAE 9:  Quiz #4, Fall 2005
           Due on Wednesday, November 30, Turnin by 10:00 pm

Use the program skeleton below (starting with #include <stdio.h>)
as the starting point for quiz4. Add the necessary code to the
functions prob1() and prob2(), and add the other 2 functions, as
described in the text below.

You do not need to change anything in main().

In void prob1(void), take a double floating-point number x from
the keyboard and compute the function f(x), which is defined by:

        f(x) = exp(x)-log10(x)+log(x) if x >=4
        f(x) = x * sin(x) if  -3 < x < 4
        f(x) = x*2 + 4*x - sinh(x)  if x <= -3.

This function should be computed in:  double func(double x).

In prob1(void), print x and f(x) on the screen.

In void prob2(void), take the number of elements k that
is less than 16, and the elements of a k-component vector v[] from the
keyboard. Print the entered vector v[] on the screen.

Pass the vector v[] and k to a double function:
double norm(double *v, int k) to compute and
return the length of the vector, and the unit vector components.

In prob2(void), print the components of the unit vector
on the screen. If k>5, let 5 components of the vector appear in
one line on the screen. Print also the length of the original
vector.
*/

/* Program skeleton */
#include <stdio.h>
#include <math.h>
void prob1(void);
void prob2(void);

double func(double x);
double norm(double *v, int k);

main()
{
int menu;
printf("There are two functions: prob1() and prob2().\n");
printf("Enter the function number to execute (1 or 2):");
scanf("%d", &menu);
/* form a switch to execute one function */
switch(menu)
{
 case 1:
    prob1();
    break;
 case 2:
    prob2();
    break;
 default:
printf("prob%d() does not exist.\n", menu);
}
exit(0);
}

/*  Problem 1 */
void prob1(void)
{
printf("Here is Problem 1:\n");

return;
}

double func(double x)
{

}


/*  Problem 2 */
void prob2(void)
{
double v[15];
printf("Here is  Problem 2:\n");

return;
}

double norm(double *v, int k)
{

}

.........................

/*

Your output should look like:

iacs5.ucsd.edu 36: a.out

There are two functions: prob1() and prob2().
Enter the function number to execute (1 or 2): 1

Here is Problem 1.
Enter a double f-p constant: 1.2

f(1.2) = 1.118e+00

iacs5.ucsd.edu 37: a.out

There are two functions: prob1() and prob2().
Enter the function number to execute (1 or 2): 2

Enter the number of elements (<16): 7

Enter 7 double f-p constants
-1.2 3.1 -0.5 2.1 7.15 -2.4 0.96

v[] as entered:
-1.200e+00 3.100e+00  -5.000e-01 2.100e+00  7.150e+00
-2.400e+00 9.600e-01

normalized v[]:
-1.400e-01 3.616e-01  -5.832e-02 2.449e-01  8.339e-01
-2.799e-01 1.120e-01

||v||=8.574e+00

*/