Ohms Law Calculator

#include<stdio.h>
#include<conio.h>
void main()
{
      char ch;
      float voltage , current , resistance , result;
      clrscr();
      printf("Ohms law calculator.\n");
      printf("Please choose from following calculcations.\n");
      printf("1. choose 1 to calculate the voltage.\n");
      printf("2. choose 2 to calculate the current.\n");
      printf("3. choose 3 to calculate the resistance.\n");
      printf("Anything else to quit.\n");
      scanf("%c",&ch);
      switch(ch)
     {
           case '1' :
           {
           printf("please enter the current in amps.\n");
           scanf("%f",¤t);
           printf("Now enter the resistance in ohms.\n");
          scanf("%f",&resistance);
          result = current * resistance;
          printf("The voltage is %0.2f volts.\n",result);
          break;
          }
          case '2' :
         {
          printf("please enter the voltage in volts.\n");
          scanf("%f",&voltage);
          printf("Now enter the resistance in ohms.\n");
          scanf("%f",&resistance);
          result = voltage / resistance;
          printf("The current is %0.2f amps.\n",result);
          break;
         }
          case '3' :
         {
          printf("please enter the voltage in volts.\n");
          scanf("%f",&voltage);
          printf("Now enter the current in amps.\n");
          scanf("%f",¤t);
          result = voltage / current;
          printf("The resistance is %0.2f ohms.\n",result);
          break;
         default :
         exit(0);
        }
   }
getch();
}