This is infix to postfix program. My request is to put comments on the codes. The purpose is so I can understand the code better. Thanks

#include

#include

using namespace std;

class Postfix

{

private:

char *in;

char *p;

char *st;

int t;

public:

Postfix();

void getinfix();

void showinfix();

void showpostfix();

void a(char e);

char b();

void convertToPostfix();

int pre(char);

~Postfix();

};

Postfix::Postfix(void)

{

t=-1;

in=new char[50];

p=new char[50];

st=new char[10];

}

void Postfix::getinfix()

{

cout<<"infix expression :";

cin>>in;

}

void Postfix::showinfix()

{

cout<

}

void Postfix::convertToPostfix()

{

int i,j;

char ch;

j=0;

for(i=0;*(in+i)!='\0';i++)

{

if(isalnum(*(in+i)))

{

p[j]=*(in+i);

j++;

}

else if(*(in+i)=='(')

a(*(in+i));

else if(*(in+i)==')')

{

while((ch=b())!='(')

{

p[j]=ch;

j++;

}

}

else

{

while(pre(*(in+i))<=pre(st[t]) && t!=-1)

{

ch=b();

p[j]=ch;j++;

}

a(*(in+i));

}

}

while(t!=-1)

{

ch=b();

p[j]=ch;j++;

}

p[j]='\0';

}

void Postfix::showpostfix()

{

cout<<"Postfix Expression: "<

}

void Postfix::a(char e)

{

if(t==9)

{

cout<<"overflow";

}

else

{

t++;

st[t]=e;

}

}

char Postfix::b()

{

if(t==-1)

{

cout<<"underflow";return -1;

}

else

{

char ch=st[t];

t--;

return ch;

}

}

int Postfix::pre(char e)

{

switch(e)

{

case '+':

case '-':return 1;

case '*':

case '/':return 2;

default: return 0;

}

}

Postfix :: ~Postfix()

{

delete []in;

delete []p;

delete []st;

}

int main()

{

Postfix obj;

obj.getinfix();

obj.convertToPostfix();

obj.showinfix();

obj.showpostfix();

return 0;

}