Switch Case İle Dört İşlem

#include <stdio.h>
#include <conio.h>

int main(){
int sayi1,sayi2,sonuc=0;
double bolum=0;
int secim;
char devam;

printf("1-Toplama\n2-Cikarma\n3-Carpma\n4-Bolme\n");
printf("Secim Yapiniz:"); scanf("%d",&secim);

printf("\nGir Sayi1:"); scanf("%d",&sayi1);
printf("Gir Sayi2:"); scanf("%d",&sayi2);

switch(secim){
case 1: sonuc=sayi1+sayi2; printf("%d",sonuc);break;
case 2: sonuc=sayi1-sayi2; printf("%d",sonuc);break;
case 3: sonuc=sayi1*sayi2; printf("%d",sonuc);break;
case 4: bolum=sayi1/sayi2; printf("%f",bolum);break;}

printf("\n\n Program Devam Etsin mi ? E / H ? : \n\n ");scanf("%c",&devam);

if(getch() == 'e' || getch() == 'E'){
return main();

}

}s