Menu Based Temperature conversion

#include<stdio.h>
#include<math.h>
//Menu Based Temperature conversion


int main()
{
    int choise;
    float f,c,cal;
    printf("Temperature conversion menu \n");
    printf("1.fahrenheit to celsius\n");
    printf("2.celsius to fahrenheit\n");
    printf("please enter your choice: ");
    scanf("%d",&choise);
    switch(choise){
    case 1:{
        printf("enter the fahrenheit temperature: ");
    scanf("%f",&f);
    cal=(f-32)*(5/9);
    printf("the temperature in celsius is %f",cal);
    break;

    }
    case 2:{
        printf("enter the celsius temperature: ");
    scanf("%f",&c);
    cal=(c*(9/5))+32;
    printf("the temperature in fahrenheit is %f",cal);
    break ;
    }
    default:
        printf("not a correct option");}

    return 0;
}