Untitled

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
void prob1(void);
void prob2(void);
 
double func(double x);
double norm(double *v, int k);
 
int main(void)
{
  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);
    break;
  }
  exit(0);
}
 
/*  Problem 1 */
void prob1(void)
{
  double x;
  printf("Here is Problem 1:\n");
  printf("Enter a double f-p constant:  "); 
 
  scanf("%lf",&x);
 
  printf("f(%f) = %f\n", x, func(x));
}
 
double func(double x)
{
  if( x>= 4.0 ) 
    return exp(x)-log10(x)+log(x);
  else if( x<=-3.0 )
    return 6*x - sinh(x);
  else
    return x * sin(x) ; 
}
 
/*  Problem 2 */
void prob2(void)
{
  double v[15];
  int k;
  int i;
 
  printf("Here is  Problem 2:\n");
  printf("Enter the number of elements (<16): ");
 
  do {
    scanf("%d",&k); 
  } while (k > 15);
 
 
  printf("Enter %d double f-p constants", k);
  for( i=0; i<k; i++ ) {
    scanf("%lf",&v[i]);
    printf("%.3e ",v[i]); fflush(stdout);
  }
 
}
 
double norm(double *v, int k)
{
 
}