/***************************************************************/
/* Prof. Dr. Carsten Vogt                                      */
/* FH Koeln, Fak. 07 / Nachrichtentechnik                      */
/* http://www.nt.fh-koeln.de/vogt                              */
/*                                                             */
/* Beispielprogramm p06060202.c                                */
/* aus "C fuer Java-Programmierer", Hanser-Verlag              */
/*                                                             */
/* Demonstriert wird die Verwendung der mathematischen Funk-   */
/* tionen der Standardbibliothek.                              */
/***************************************************************/

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

int main(void) {

 int wahl, wahl2;
 double x, y, v, d;
 int i, n;
 long l;
 unsigned int initwert;

 do {

  do {

   printf("\n\nBitte auswaehlen:\n\n");
   printf("( 1 )  Exponentialfunktionen und logarithmische Funktionen\n");
   printf("( 2 )  Trigonometrische Funktionen\n");
   printf("( 3 )  Betrags- und Rundungsfunktionen\n");
   printf("( 4 )  Zufallszahlen\n");
   printf("( 5 )  Sonstige Funktionen\n");
   printf("( 0 )  Programmende\n");

   scanf("%d",&wahl);

   printf("\n");

  } while (wahl<0 || wahl>5);

  printf("\n");

  switch(wahl) {

   case 1:

    printf("Bitte auswaehlen:\n\n");
    printf("( 1 ) pow(x,y) \n");
    printf("( 2 ) exp(x) \n");
    printf("( 3 ) ldexp(x,y) \n");
    printf("( 4 ) frexp(x,n) \n");
    printf("( 5 ) sqrt(x) \n");
    printf("( 6 ) log(x) \n");
    printf("( 7 ) log10(x) \n");

    scanf("%d",&wahl2);
    printf("\n");

    switch(wahl2) {

      case 1: printf("pow(x,y):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf(" y? ");
              scanf("%lf",&y);
              printf("\npow(%lf,%lf) = %lf\n",x,y,pow(x,y));
              break;

      case 2: printf("exp(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\nexp(%lf) = %lf\n",x,exp(x));
              break;

      case 3: printf("ldexp(x,y):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf(" y? ");
              scanf("%lf",&y);
              printf("\nldexp(%lf,%lf) = %lf\n",x,y,ldexp(x,y));
              break;

      case 4: printf("frexp(x,n):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\nfrexp(%lf,n) = %lf, n = %d\n",x,frexp(x,&n),n);
              break;

      case 5: printf("sqrt(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\nsqrt(%lf) = %lf\n",x,sqrt(x));
              break;

      case 6: printf("log(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\nlog(%lf) = %lf\n",x,log(x));
              break;

      case 7: printf("log10(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\nlog10(%lf) = %lf\n",x,log10(x));
              break;

     }

    break;

   case 2:

    printf("Bitte auswaehlen:\n\n");
    printf("( 1 ) sin(x)\n");
    printf("( 2 ) cos(x)\n");
    printf("( 3 ) tan(x)\n");
    printf("( 4 ) asin(x)\n");
    printf("( 5 ) acos(x)\n");
    printf("( 6 ) atan(x)\n");
    printf("( 7 ) sinh(x)\n");
    printf("( 8 ) cosh(x)\n");
    printf("( 9 ) tanh(x)\n");

    scanf("%d",&wahl2);
    printf("\n");

    switch(wahl2) {

      case 1: printf("sin(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\nsin(%lf) = %lf\n",x,sin(x));
              break;

      case 2: printf("cos(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\ncos(%lf) = %lf\n",x,cos(x));
              break;

      case 3: printf("tan(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\ntan(%lf) = %lf\n",x,tan(x));
              break;

      case 4: printf("asin(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\nasin(%lf) = %lf\n",x,asin(x));
              break;

      case 5: printf("acos(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\nacos(%lf) = %lf\n",x,acos(x));
              break;

      case 6: printf("atan(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\natan(%lf) = %lf\n",x,atan(x));
              break;

      case 7: printf("sinh(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\nsinh(%lf) = %lf\n",x,sinh(x));
              break;

      case 8: printf("cosh(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\ncosh(%lf) = %lf\n",x,cosh(x));
              break;

      case 9: printf("tanh(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\ntanh(%lf) = %lf\n",x,tanh(x));
              break;

     }

    break;

   case 3:

    printf("Bitte auswaehlen:\n\n");
    printf("( 1 ) fabs(x)\n");
    printf("( 2 ) abs(x)\n");
    printf("( 3 ) labs(x)\n");
    printf("( 4 ) ceil(x)\n");
    printf("( 5 ) floor(x)\n");

    scanf("%d",&wahl2);
    printf("\n");

    switch(wahl2) {

      case 1: printf("fabs(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\nfabs(%lf) = %lf\n",x,fabs(x));
              break;

      case 2: printf("abs(x):\n");
              printf(" x? (int-Wert) ");
              scanf("%d",&i);
              printf("\nabs(%d) = %d\n",i,abs(i));
              break;

      case 3: printf("labs(x):\n");
              printf(" x? (long-Wert) ");
              scanf("%ld",&l);
              printf("\nlabs(%ld) = %ld\n",l,labs(l));
              break;

      case 4: printf("ceil(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\nceil(%lf) = %lf\n",x,ceil(x));
              break;

      case 5: printf("floor(x):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf("\nfloor(%lf) = %lf\n",x,floor(x));
              break;

     }

    break;

   case 4: printf("Anfangswert des Zufallszahlengenerators: ");
           scanf("%ud",&initwert);
           srand(initwert);
           printf("\n10 Zufallszahlen:\n");
           for (i=0;i<10;i++)
            printf("%d ",rand());
           printf("\n\n");
           printf("RAND_MAX = %ld\n\n",RAND_MAX);
           break;

   case 5:

    printf("Bitte auswaehlen:\n\n");
    printf("( 1 ) fmod(x,y)\n");
    printf("( 2 ) modf(v,d)\n");

    scanf("%d",&wahl2);
    printf("\n");

    switch(wahl2) {

      case 1: printf("fmod(x,y):\n");
              printf(" x? ");
              scanf("%lf",&x);
              printf(" y? ");
              scanf("%lf",&y);
              printf("\nfabs(%lf,%lf) = %lf\n",x,y,fmod(x,y));
              break;

      case 2: printf("modf(v,d):\n");
              printf(" v? ");
              scanf("%lf",&v);
              printf("\nmodf(%lf,d) = %lf, d = %lf\n",v,modf(v,&d),d);
              break;

     }

    break;

  }

 } while (wahl!=0);

}