Oh... thank you so much... I should have been able to notice that... Well, thank you again.
---------- Post updated 03-16-11 at 10:42 AM ---------- Previous update was 03-15-11 at 09:19 PM ----------
The program is:
Code:
//Convert an infix expression to postfix expression...
#include<iostream>
#include<string>
#include<cstdlib>
using namespace std;
char ifx[50],pfx[50],stk[50];
int top=-1,n;
char push(char ch)
{
if(top!=n)
{
ch=stk[top];
top++;
return ch;
}
else
cout<<"\nThe stack is full.";
}
void pop()
{
char rmv;
if(top!=-1)
{
rmv=stk[top];
top--;
cout<<"\nElement removed was "<<rmv;
}
else
cout<<"\nThe stack is empty.";
}
char topele()
{
char t;
if(top==-1)
t='#';
else
t=stk[top];
return t;
}
int chkpres()
{
char ch;
switch(ch)
{
case '^': return 5;
break;
case '*': return 4;
break;
case '/': return 3;
break;
case '+': return 2;
break;
case '-': return 1;
break;
default: exit(1);
break;
}
}
int main()
{
char pre,pres,ele,elem,chk,popp,topp;
cout<<"\nEnter how many elements you want to enter in the infix expression: ";
cin>>n;
topp=stk[top];
cout<<"\nEnter the characters of the infix expression one by one: ";
for(int i=0;i<n;++i)
{
cin>>ifx[i];
//for(int i=0;ifx[i]='\0';++i)
//{
if(ifx[i]!='^' && ifx[i]!='*' && ifx[i]!='/' && ifx[i]!='+' && ifx[i]!='-')
pfx[i]=ifx[i];
else if(ele=='(')
{
ele=ifx[i];
push(ele);
top++;
}
else if(ifx[i]=='^'||ifx[i]=='*'||ifx[i]=='/'||ifx[i]=='+'||ifx[i]=='-')
{
if(topp=='^'||topp=='*'||topp=='/'||topp=='+'||topp=='-')
{
pre=ele;
pres=topp;
chk=chkpres();
if(pre>pres)
{
topp=pre;
top++;
}
else if(pres>=pre)
pfx[i]=pres;
}
}
else if(ele=')')
{
while(topp!='#')
{
popp=topp;
pfx[i]=popp;
}
}
// }
}
cout<<"\nThe postfix expression is: ";
for(int i=0;pfx[i]!='\0';++i)
{
cout<<pfx[i];
}
return 0;
}
OUTPUT is:
Code:
Enter how many elements you want to enter in the infix expression: 9
Enter the characters of the infix expression one by one: a
*
(
b
+
c
)
/
d
The postfix expression is: a
Could you please help me to fix it...
Last edited by pludi; 03-16-2011 at 05:05 AM..
Reason: code tags, please
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LEARN ABOUT SUSE
ausearch_add_regex
AUSEARCH_ADD_REGEX(3) Linux Audit API AUSEARCH_ADD_REGEX(3)NAME
ausearch_add_regex - use regular expression search rule
SYNOPSIS
#include <auparse.h>
int ausearch_add_regex(auparse_state_t *au, const char *expr);
DESCRIPTION
ausearch_add_regex adds one search condition based on a regular expression to the current audit search expression. The search conditions
can then be used to scan logs, files, or buffers for something of interest. The regular expression follows the posix extended regular
expression conventions, and is matched against the full record (without interpreting field values).
If an existing search expression E is already defined, this function replaces it by (E && this_regexp).
RETURN VALUE
Returns -1 if an error occurs; otherwise, 0 for success.
SEE ALSO ausearch_add_expression(3), ausearch_add_item(3), ausearch_clear(3), ausearch_next_event(3), regcomp(3).
AUTHOR
Steve Grubb
Red Hat Sept 2007 AUSEARCH_ADD_REGEX(3)