Лабы / Калькулятор / Calc / func1

#include "stdafx.h"
#include <string>
#include <iostream>
using namespace std;
//-------Умножение и деление----------------------------------
string func1(string str)
{
	char sres[10];
	char *tmp1,*tmp2;
	int p0,p1,p2,i;
	
	while(str.find("*",0)!=-1||str.find("/",0)!=-1)
	{
		p0=str.find_first_of("*/",0);
		p1=-1;
		for(i=0;i<p0;i++)
			if((str[i]=='+'||(str[i]=='-'&&i!=0))&&(str[i-1]!='e'))
				p1=i;
		tmp1=new char[p0-p1-1];
		str.copy(tmp1,p0-p1-1,p1+1);		
		p2=str.find_first_of("+-*/",p0+1);
		if(str[p2-1]=='e'||str[p2-1]=='*'||str[p2-1]=='/')
			p2=str.find_first_of("+-*/",p2+1);
		if(p2==-1) p2=str.length();
		tmp2=new char[p2-p0-1];
		str.copy(tmp2,p2-p0-1,p0+1);
		if(str[p0]=='*') _gcvt(atof(tmp1)*atof(tmp2),15,sres);
		if(str[p0]=='/'&&str[p0+1]!='0') _gcvt(atof(tmp1)/atof(tmp2),15,sres);
		if(str[p0]=='/'&&str[p0+1]=='0')
		{
			str="!divizion by zero";
			break;
		}
		str.replace(p1+1,p2-p1-1,sres);
		delete [] tmp1;
		delete [] tmp2;
	}
	return str;
}