Kalkulacka - skoro final

#include <stdio.h>
#include <stdlib.h>
int soucet(a,b){
    printf("%d",a);
    printf(" + ");
    printf("%d",b);
    printf(" = ");
    printf("%d\n",a+b);
    return(a+b);
}
int rozdil(a,b){
    printf("%d",a);
    printf(" - ");
    printf("%d",b);
    printf(" = ");
    printf("%d\n",a-b);
    return(a-b);
}
int soucin(a,b){
    printf("%d",a);
    printf(" * ");
    printf("%d",b);
    printf(" = ");
    printf("%d\n",a*b);
    return(a*b);
}
int podil(a,b){

    printf("%d",a);
    printf(" // ");
    printf("%d",b);
    printf(" = (zaokr) = ");
    printf("%d\n", (a/b));
    return(a/b);
}


int a, b;
int main()

{
      printf("KALKULACKA - PRVNI PROGRAM - SE NEPOSER!\n");
      printf("Zadejte hodnoty!\n");
      printf("a = ");
      scanf("%d", &a);
      printf("b = ");
      scanf("%d", &b);
      printf("Stiskni \n[A]:scitani \n[B]:odcitani \n[C]:nasobeni \n[D]:deleni\nJo, a jeste to potvrd entrem! \n");
      getchar();
    switch(getchar()) {
    default :
            main();
    case 'a':
    case 'A':
            soucet(a,b);
            printf("Stiskni cokoliv pro navrat do nabidky...");
            getchar();
            getchar();
            main();
    case 'b':
    case 'B':
            rozdil(a,b);
            printf("Stiskni cokoliv pro navrat do nabidky...");
            getchar();
            getchar();
            main();
    case 'c':
    case 'C':
            soucin(a,b);
            printf("Stiskni cokoliv pro navrat do nabidky...");
            getchar();
            getchar();
            main();
    case 'd':
    case 'D':
            podil(a,b);
            printf("Stiskni cokoliv pro navrat do nabidky...");
            getchar();
            getchar();
            main();

}
}