//関数f(x),g(x)の値を求めるプログラム　


#include <stdio.h>
#include <math.h>
#define f(x) x*x 
int k;
void main(void)
{
 double i;
 
 double g(i,k);
 printf("1...sqrt(x)   2...2x  e...End\n");
 while (printf("Input k="), scanf("%d",&k)!=0){

for (i=0;i<=10;i++){
  printf("%f %f %f\n",i,g(i,k),f(i));
 }
 }
}  
//def function　g(x)
 double g(double x,int k)
  {
	switch(k)
    {
	case 1:
		return sqrt(x);
		break;
	case 2:
	    return 2*x;
		break;
	default:
		return 0;
        break;
	}
 }