How can I solve the code below errors in C++?

Question

 Please solve the errors.

This is my code :

 

#include "stdafx.h"
# include <iostream>
# include <string.h>
# include <stdlib.h>
# include <conio.h>
using namespace std;
int top=-1;

char Stack[25][100]={NULL};

void push(const char *);
const char* pop( );

void postfix_to_infix(constchar *);

int main( )
{
clrscr( );

char Postfix_expression[100]={NULL};

cout<<"\n\n\t Enter the Postfix Expression : ";
cin.getline(Postfix_expression,80);

postfix_to_infix(Postfix_expression);

getch( );
return 0;
}


/*************************************************************************///----------------------------- push(const char) ----------------------///*************************************************************************/void push(constchar *Symbol)
{
if(top==24)
cout<<"Error : Stack is full."<<endl;

else
{
top++;
strcpy(Stack[top],Symbol);
}
}

/*************************************************************************///-------------------------------- pop( ) -----------------------------///*************************************************************************/constchar* pop( )
{
char Symbol[100]={NULL};

if(top==-1)
cout<<"Error : Stack is empty."<<endl;

else
{
strcpy(Symbol,Stack[top]);
strset(Stack[top],NULL);
top--;
}

return Symbol;
}

/*************************************************************************///--------------------- postfix_to_infix(const char *) ----------------///*************************************************************************/void postfix_to_infix(constchar *Postfix)
{
char Infix_expression[100]={NULL};
char Postfix_expression[100]={NULL};

strcpy(Postfix_expression,Postfix);
strcat(Postfix_expression,"=");

int count=0;

char Symbol_scanned[5]={NULL};

do
{
Symbol_scanned[0]=Postfix_expression[count];

if(Symbol_scanned[0]=='/' || Symbol_scanned[0]=='*' ||
Symbol_scanned[0]=='-' || Symbol_scanned[0]=='+' ||
Symbol_scanned[0]=='^' )
{
char Value_1[100]={NULL};
char Value_2[100]={NULL};
char Result[100]={NULL};

strcpy(Value_1,pop( ));
strcpy(Value_2,pop( ));

if(Infix_expression[(count+1)]!='=')
strcpy(Result,"(");

strcat(Result,Value_2);
strcat(Result,Symbol_scanned);
strcat(Result,Value_1);

if(Infix_expression[(count+1)]!='=')
strcat(Result,")");

push(Result);
}

else
push(Symbol_scanned);

count++;
}
while(Postfix_expression[count]!='=');

strset(Infix_expression,NULL);
strcpy(Infix_expression,pop( ));

cout<<"\n\n\t Infix Expression is : "<<Infix_expression;
}