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Temperature conversion

#include < stdio.h >

void main()
{
int from , to;
float value;

printf("Temperature Conversion\n");
printf("Enter no of Unit to covert from : \n 1.celcius\n 2. Farenheit\n 3. Kelvin");
scanf("%d",&from);

printf("Enter no of Unit to covert to : \n 1.celcius\n 2. Farenheit\n 3. Kelvin");
scanf("%d",&to);

printf("Enter The value to convert: ");
scanf("%f",&value);

/*converting given value from specified unit to Kelvin*/
switch(from) {
  case 1:
  value= value + 273.15; break;
  case 2:
  value= (value+459.67)*5/9; break;
  case 3: break;
  default: break;
  }

/*converting value from Kelvin to specified unit*/
switch(to) {
  case 1:
  value= value-273.15; break;
  case 2:
  value= value*9/5-459.67; break;
  case 3: break;
  default: break;
  }

printf("Converted Value : %f", value);
}