При работе с программой выдает не результат, а какие то непонятные символы

#include <iostream>
#include <stdlib.h>
using namespace std;
class Zayavka {
char *nomeravtobysa, *FIO, *nomermarshryta, *park;
public:
Zayavka() {
nomeravtobysa = "73";
FIO = "Yakov4ykDima";
nomermarshryta = "198";
park = "da";
}
Zayavka(char *nomeravtobysa1, char *FIO1, char *nomermarshryta1, char *park1) {
nomeravtobysa = nomeravtobysa1;
FIO = FIO1;
nomermarshryta = nomermarshryta1;
park = park1;
}
void GetInfo(char *a0, char *a1, char *a2, char *a3) {
nomeravtobysa = a0;
FIO = a1;
nomermarshryta = a2;
park = a3;
}
void writeDat() {
cout << nomeravtobysa << " " << FIO << " " << nomermarshryta << " " << park <<endl;
}
void SrchnShow(char *a3, char *num)
 {
    char number;
    number=*num;
        if (a3=="da")
            cout<< "Avtobys #   " <<number<<"  v parke"<<endl;
        else cout<<"Error"<<endl;
}
};
void main() {
int a;
int n=1;
char *t1;
char *num;
a=1;
Zayavka *lib = new Zayavka[n];
while (a!=0) {
cout << "Rabota so spiskom:"<<endl;
cout << "1. Vivesti v vide spiska.\n";
cout << "2. Dobavit avtobys. \n";
cout << "3. Vivod avtobysov kotorie v parke:  \n";
cout << "0. Vixod. \n";
cin >> a;
if (a == 1) {
for (int i = 1; i< n; i++)
lib[i].writeDat();
}
if (a == 2) {
cout << "Vvedite dannie: nomer_avtobysa, FIO, nomer_marshryta, V parke(Y/N)? ):" << endl;
char  *a0 = new char[20], *a1 = new char[20], *a2 = new char[20], *a3 = new char[20];
cin >> a0 >> a1 >> a2 >> a3;
lib[n++].GetInfo(a0,a1,a2,a3);
num=a1;
delete  a1;
delete  a2;
delete  a3;
}
if (a == 3) {
t1="da";
for (int i = 1; i< n; i++)
{
lib[i].SrchnShow(t1,num);
}
}
}
}

for (int i = 1; i< n; i++)
{
  lib[i].SrchnShow(t1,num);
}

...
num=a1;
delete  a1;
...

void SrchnShow(char *a3, char *num)
 {
    char number;
    number=*num;
        if (a3=="da")
            cout<< "Avtobys #   " <<number<<"  v parke"<<endl;
        else cout<<"Error"<<endl;
}

class Zayavka {
char *nomeravtobysa, *FIO, *nomermarshryta, *park;
public:
Zayavka() {
nomeravtobysa = "73";
FIO = "Yakov4ykDima";
nomermarshryta = "198";
park = "da";
}

void SrchnShow(char *a3, char *num)
 {
    char number;
    number=*num;
        if (a3=="da")
            cout<< "Avtobys #   " <<number<<"  v parke"<<endl;
        else cout<<"Error"<<endl;
}

void SrchnShow()
 {
    
        if (park == "da")
            cout<< "Avtobys #   " <<nomeravtobysa<<" naxoditsa   v parke"<<endl;
        else cout<<"Error"<<endl; 
}

void SrchnShow()
{
 
 int result;
 char str1[]="da";
 result = strcmp( str1, park );
 if (result < 0)
 {
            cout<< "Avtobys # " <<nomeravtobysa<<" naxoditsa   v parke"<<endl;
            {
                if (result == 0) cout<< "Net avtobysov v parke!"<<endl;
                else cout<<"Error"<<endl;
            }
 }
}

if (result < 0)
{
    cout<< "Avtobys # " <<nomeravtobysa<<" naxoditsa * v parke"<<endl;
    {
        // result никогда не будет 0, т.к. сюда попадет только когда result < 0
        if (result == 0) cout<< "Net avtobysov v parke!"<<endl;
        else cout<<"Error"<<endl;
}
}

void SrchnShow()
 {
    int result;
    char str1[]="da";
    result = strcmp( str1, park );
        if(result == 0 )
            cout<<"error"<<endl; 
        
        if (result < 0)
            cout<< "Avtobys#   "<<nomeravtobysa<<"   V PARKE "<<endl;
         
}