C :

#include "stdio.h"
 
int main()
{
    int a;
    float b;
    char c;
    while(scanf("%d",&a) != EOF)
 {
  switch(a){
  	case 0: printf("1\n");break;
  	case 1: c='C';break;
  	case 2: c='C';break;
  	case 3: c='D';break;
  	case 4: c='A';break;
  	case 5: c='B';break;
  	case 6: c='C';break;
  	case 7: c='C';break;
  	case 8: c='D';break;
  	case 9:  printf("0\n");break;
  	case 10: b=0.75;break;
  	case 11: printf("8\n");break;
  	case 12: printf("0\n");break;
  	case 13: b=0.586*2;break;
  	case 14: b=1.018;break;
  	case 15: b=0.976;//b=0.94*0.02+0.03*0.05+0.02*0.10+0.01*0.15;break;
  	
  }
   if(a==1||a==2||a==3||a==4||a==4||a==5|a==6||a==7||a==8)
   printf("%c\n",c);
   else if(a==10||a==13||a==14||a==15)
   printf("%.3f\n",b);
  }
    return 0;
}

C++ :

#include <stdio.h>
 int main()
 {
    int a;
    while(scanf("%d",&a) != EOF)
 {
      if (a==1)
      { 
        printf("C\n");
	  }
      else if (a==2)
	  {
        printf("C\n");
	  }
     else if (a==3)
	 {
		 printf("D\n");
	 }
    else if (a==4)
	{
        printf("A\n");
	}
    else if (a==5)
	{
        printf("B\n");
	}
    else if (a==6)
	{
        printf("C\n");
	}
    else if (a==7)
	{
        printf("C\n");
	}
    else if (a==8)
	{
        printf("D\n");
	}
    else if (a==9)
	{
        printf("0\n");
	}
    else if (a==10)
	{
        printf("0.750\n");
	}
    else if (a==11)
	{
        printf("8\n");
	}
    else if (a==12)
	{
        printf("0\n");
	}
    else if (a==13)
	{
        printf("1.172\n");
	}
    else if (a==14)
	{
        printf("1.019\n");
	}
    else if (a==15)
	{
        printf("0.976\n");
	 }
	else 
	 {
		printf("1");
	}
}
    return 0;
 }

Java :

import java.util.*;
public class Main {
	public static void main(String args[]) {
		Scanner cin = new Scanner(System.in);
		int a;
		 double b;
		while (cin.hasNext()) {
			a = cin.nextInt(); 
			if (a==1){
				
System.out.printf("C\n");
   
}
else if (a==2){
System.out.printf("C\n");}
else if (a==3){

System.out.printf("D\n");}
else if (a==4){
	
System.out.printf("A\n");}
else if (a==5){
	
System.out.printf("B\n");}
else if (a==6){
	
System.out.printf("C\n");}
else if (a==7){
	
System.out.printf("C\n");}
else if (a==8){
	
System.out.printf("D\n");}
else if (a==9){
	
System.out.printf("0\n");}
else if (a==10){
	
System.out.printf("0.750\n");}
else if (a==11){
	
System.out.printf("8\n");}
else if (a==12){
	
System.out.printf("0\n");}
else if (a==13){
	
System.out.printf("1.172\n");}

else if (a==14){
	
System.out.printf("1.019\n");}
else if (a==15){
	
System.out.printf("0.976\n");}

else if (a==0){

System.out.printf("1\n");}

}
	}	}