#include<iostream>
#include<math.h>
#include<stdexcpt.h>
using namespace std;
class calc
{
private:
int len,
intPartTemp,
intLen,
floatLen,
ten,
str;
double value,
floatPartTemp,
x;
char ch[1000] ;
char carriage[100];
char copy [1000];
void setInfo()
{
cin.getline(copy,1000);
copyArray(copy, ch);
replace(x,'x');
}
void copyArray (char main [], char copy [] )
{
int len = strlen(main);
int temp;
for(temp=0;temp<=len;temp++)
{
copy[temp] = main[temp];
}
}
void edit()
{
int temp;
len = strlen(ch);
for(temp=0;temp<len;temp++)
{
if(!triangleMove(temp) && isalpha(ch[temp]) && isalpha(ch[temp+1]) )
insert(temp,len,'*');
else if(temp!=0 && isalpha(ch[temp]) && isdigit(ch[temp-1]))
insert(temp,len,'*');
else if(temp!=0 && ch[temp] == '(' && ch[temp-1] ==')' )
insert(temp,len,'*');
else if(temp!=0 && ch[temp] == '(' && isdigit(ch[temp-1]) )
insert(temp,len,'*');
else if( ( ch[temp]=='.' && temp == 0) || ( temp>0 && ch[temp] == '.' && !isdigit( (ch[temp-1]) ) ) )
insert(temp,len,'0');
else if( ch[temp] == '+' && ch[temp+1] =='+' )
smaller(temp,len,'+');
else if( ch[temp] == '+' && ch[temp+1] =='-' )
smaller(temp,len,'-');
else if( ch[temp] == '-' && ch[temp+1] =='-' )
smaller(temp,len,'+');
else if( ch[temp] == '-' && ch[temp+1] =='+' )
smaller(temp,len,'-');
}
if(ch[0]=='+')
decrease(0,1);
}
bool exam ()
{
int leftBracket=0,
rightBracket=0,
len = strlen(ch),
temp;
for(temp = 0; temp<len; temp++)
{
if( isdigit(ch[temp]) )
continue;
else if(ch[temp] == '(')
leftBracket ++;
else if(ch[temp] == ')')
rightBracket ++;
else if( !isalpha(ch[temp]) && !isalpha(ch[temp+1]) && !isdigit(ch[temp+1]) )
return false;
}
if(rightBracket != rightBracket)
return false;
if( !isdigit (ch[len-1] ) && ch[len-1] != ')' )
return false;
return true;
}
bool triangleMove(int &temp)
{
if(ch[temp] == 's' && ch[temp+1] == 'i' && ch[temp+2] == 'n' && ch[temp+3] == '(' && isdigit(ch[temp+4]) )
{
temp+=4;
return true;
}
else if(ch[temp] == 'c' && ch[temp+1] == 'o' && ch[temp+2] == 's' && ch[temp+3] == '(' && isdigit(ch[temp+4]) )
{
temp+=4;
return true;
}
else if(ch[temp] == 't' && ch[temp+1] == 'a' && ch[temp+2] == 'n' && ch[temp+3] == '(' && isdigit(ch[temp+4]) )
{
temp+=4;
return true;
}
return false;
}
bool triangle (int temp)
{
if(ch[temp] == 's' && ch[temp+1] == 'i' && ch[temp+2] == 'n' && ch[temp+3] == '(' && isdigit(ch[temp+4]) )
{
return true;
}
else if(ch[temp] == 'c' && ch[temp+1] == 'o' && ch[temp+2] == 's' && ch[temp+3] == '(' && isdigit(ch[temp+4]) )
{
return true;
}
else if(ch[temp] == 't' && ch[temp+1] == 'a' && ch[temp+2] == 'n' && ch[temp+3] == '(' && isdigit(ch[temp+4]) )
{
return true;
}
return false;
}
void increase (int order, int &len, int count)
{
int temp, temp2;
for(temp2=0; temp2<count; temp2++)
{
len++;
for(temp=len;temp>order;temp--)
{
ch[temp]=ch[temp-1];
}
}
}
void decrease (int order, int count)
{
int temp, temp2;
int len = strlen(ch);
for(temp2=0;temp2<count;temp2++)
{
for(temp=order;temp<len;temp++)
{
ch[temp]=ch[temp+1];
}
len--;
}
}
void insert(int order, int &len, char ob)
{
increase (order, len,1);
ch[order] = ob;
}
void smaller(int order, int &len, char ob)
{
decrease(order, 1);
ch[order] = ob;
}
int getNumLen(double num)
{
int intPart,
temp,
numLen;
bool plus = false;
double floatPart;
if(num<0)
{
plus = true;
num*=-1;
}
intPart = intPartTemp = static_cast<int>(num);
floatPart = floatPartTemp = num - intPart;
for(intLen=0;intPart>0;intPart/=10)
{
intLen++;
}
if(intLen == 0)
intLen = 1;
floatPart>0?floatLen=1:floatLen=0;
for(temp= 1; floatPart!=0 && floatLen<10 ; floatLen++)
{
floatPart*=10;
temp = static_cast<int>(floatPart) ;
floatPart-=temp;
}
if(plus){
intLen++;
intPart *=-1;
}
numLen = intLen + floatLen;
return numLen;
}
void convert(char carriage[], double num, int intLen, int intPart, int floatLen, double floatPart, int numLen, bool sign )
{
int temp1, temp;
int start = 0;
if(numLen>0)
{
carriage[numLen]=0;
}
else
{
numLen=1;
carriage[numLen]=0;
}
if(!sign){
start ++;
carriage[0] = '-';
}
for(temp=intLen-1;temp>=start;temp--)
{
temp1= intPart % 10 ;
carriage[temp]= temp1+48;
intPart/=10;
}
if(floatPart!=0){
carriage[intLen]='.';
carriage[intLen + floatLen ]=0;
for(temp=intLen+1;temp<floatLen+intLen; temp++)
{
floatPart*=10;
temp1 = floatPart;
carriage[temp]=temp1+48;
floatPart-=temp1;
}
}
}
void replace ( double num, char var)
{
int len = strlen(ch);
int temp;
for(temp=0;temp<len;temp++)
{
if(ch[temp]==var)
{
decrease(temp,1);
insertNum(temp, num);
}
}
}
double getFloatNum (int &position, int count)
{
double num;
int temp;
int arrange;
ten = 10;
num = 0;
arrange=1;
for(temp=0; isdigit(ch[position]) && temp<count; temp++)
{
num = num + (ch[position++]-48)/pow(ten,static_cast<double>(arrange++));
}
position--;
return num;
}
double getNum (int &position)
{
double num,
floatPart;
double sign = 1;
ten = 10;
num = 0;
if(ch[position]=='-')
position++;
if( (position>0 && ch[position-1] == '-') || (position==0 &&ch[position] =='-') )
{
sign = false;
}
while(isdigit(ch[position]))
{
num = num *10 + ch[position]-48;
position++;
}
position--;
if(ch[position+1]=='.')
{
position+=2;
floatPart = getFloatNum(position, 5);
num = num + floatPart ;
}
if(!sign)
num*=-1;
return num;
}
bool check(int temp, double &num1 , double &num2, char &symbol)
{
int len1,
len2;
num1 = getNum(temp);
len1 = getNumLen(num1);
while(isdigit(ch[temp]))
temp++;
temp--;
if(ch[temp+1]!=0 && !isdigit(ch[temp+1]) )
{
symbol = ch[++temp];
num2 = getNum (++temp);
len2 = getNumLen (num2);
return true;
}
else
return false;
}
void trigon_op(int &temp)
{
double num,
insNum;
int numLen;
len = strlen(ch);
if(ch[temp]=='s' && ch[temp+1] =='i' && ch[temp+2] =='n')
{
temp+=4;
insNum = getNum(temp);
numLen= getNumLen(insNum);
temp-=3+numLen;
decrease(temp,numLen+5);
num=sin(insNum);
insertNum(temp, num);
temp+=getNumLen(num);
}
else if(ch[temp]=='c' && ch[temp+1] =='o' && ch[temp+2] =='s')
{
temp+=4;
insNum = getNum(temp);
numLen= getNumLen(insNum);
temp-=3+numLen;
decrease(temp,numLen+5);
num=cos(insNum);
insertNum(temp, num);
}
else if(ch[temp]=='t' && ch[temp+1] =='a' && ch[temp+2] =='n')
{
temp+=4;
insNum = getNum(temp);
numLen= getNumLen(insNum);
temp-=3+numLen;
decrease(temp,numLen+5);
num=tan(insNum);
insertNum(temp, num);
}
}
void getBorders(int &str, int &end)
{
int len = strlen(ch) -1 ;
int temp;
str=0;
end = len;
for(temp=0;temp<len;temp++)
{
if(temp>0 && ch[temp]=='(' && !isalpha(ch[temp-1]) )
str=temp+1;
else if(str > 0 && ch[temp]== ')' && !isalpha(ch[str-1]) )
{
end = temp;
break;
}
}
}
void process (double num1, double num2, char symbol, int temp)
{
int len1 = getNumLen(num1),
len2 = getNumLen(num2),
len = strlen(ch);
int count;
double num;
if(symbol == '^')
num = pow(num1,num2);
else if(symbol == '*')
num = num1*num2;
else if(symbol == '/')
num = num1/num2;
else if(symbol == '+')
num = num1+num2;
else if(symbol == '-')
num = num1+num2;
if(num2 >= 0 && num1 >=0)
count = len1+len2;
else if(num2 >= 0 && num1 <0)
count = len1+len2;
else if(num2 < 0 && num1 >=0)
count = len1 + len2;
else if(num2 < 0 && num1 <0)
{
count = len1 + len2 ;
temp--;
}
if(symbol != '-')
count ++ ;
decrease(temp,count);
insertNum(temp,num);
edit();
}
void semiMath(int str, int end, char ch[])
{
int temp,
zero = 0;
char symbol;
double num1,
num2;
len = end;
for(temp=str;temp<len;temp++)
{
if(triangle(temp))
{
trigon_op(temp);
getBorders(str,end);
temp = str -1;
len=end+1;
}
}
len = end;
for(temp=str;temp<len;temp++)
{
if( (isdigit(ch[temp]) || ch[temp]=='-' ) && check(temp, num1, num2, symbol) )
{
if(symbol == '^')
{
process(num1,num2,symbol,temp);
getBorders(str,end);
temp = str -1;
len=end+1;}
}
}
len = end;
symbol = 0;
for(temp=str;temp<len;temp++)
{
if( (isdigit(ch[temp]) || ch[temp]=='-' ) && check(temp, num1, num2, symbol) )
{
if(symbol == '*' || symbol == '/')
{
process(num1,num2,symbol,temp);
getBorders(str,end);
temp = str -1;
len=end;
}
}
}
len = end;
symbol = 0;
for(temp=str;temp<len;temp++)
{
if( (isdigit(ch[temp]) || ch[temp]=='-' ) && check(temp, num1, num2, symbol) )
{
if(symbol == '+' || symbol == '-')
{
process(num1,num2,symbol,temp);
getBorders(str,end);
temp = str -1;
len=end;
}
}
}
}
double math (char ch[], double x)
{
int len = strlen(ch) ,
temp,
zero = 0,
end ;
double num;
edit();
if(exam())
{
for(temp = 0; temp <len; temp++)
{
getBorders(str,end);
semiMath(str, end,ch);
len = strlen(ch);
if(str !=0)
{
getBorders(str,end);
decrease(str-1,1);
decrease(end-1 ,1);
}
}
num=getNum(zero);
return num;
}
else
throw invalid_argument(
"Your formula is out of mathimatics rules");
}
void insertNum(int order, double num)
{
int temp, numLen;
int len;
numLen = getNumLen(num);
bool sign;
len = strlen(ch);
if(num>=0)
sign = true;
else
sign = false;
convert(carriage,num,intLen,intPartTemp,floatLen,floatPartTemp, numLen, sign);
for(temp = numLen-1; temp>=0 ; temp--)
{
increase(order, len,1);
ch[order] = carriage [temp];
}
}
public:
double getResult()
{
setInfo();
double num = math(ch,value);
return num;
}
double getResult(char ch[], double value)
{
double num = math(ch,value);
return num;
}
};
void main ()
{
calc test;
while(cout<<"= "<<test.getResult()<<endl<<endl<<endl);
}

Pointless.

--SA