Random Access File Writing in C

#include< stdio.h>

struct musteriVerisi{
int hesapNo;
char soyisim[15];
char isim[10];
double bakiye;
};
int main(){
    FILE*cfPtr;
    struct musteriVerisi musteri={0,"","",0.0};
    if((cfPtr=fopen("kredi.dat","r+"))==NULL)
    printf("Dosya acilamiyor\n");
    else{
        printf("Hesap numarasini giriniz(1-100)\n");
    scanf("%d",&musteri.hesapNo);
    while(musteri.hesapNo!=0)
    {
    printf("soyisim,isim,bakiye giriniz\n");
    fscanf(stdin,"%s%s%lf",musteri.soyisim,musteri.isim,&musteri.bakiye);
    fseek(cfPtr,(musteri.hesapNo-1)*sizeof(struct musteriVerisi),SEEK_SET);
    fwrite(&musteri,sizeof(struct musteriVerisi),1,cfPtr);
    printf("Hesap numarasini giriniz(1-100)\n");
    scanf("%d",&musteri.hesapNo);         
        } 
        fclose(cfPtr);
        
    }   
getch();
return 0;
}