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# include<iostream>
# include<math.h>
# include<Windows.h>
using namespace std;
void main()
{
HANDLE hConsole;
hConsole = GetStdHandle (STD_OUTPUT_HANDLE);
SetConsoleTextAttribute
(hConsole, FOREGROUND_BLUE | FOREGROUND_INTENSITY);
double *coff=NULL,*power=NULL;
int nofd=0,degree=0;
double fofx=0,x=0;
char ct;
int nod=0;
do{
std::cout<<"\nEnter the degree of equation : ";
cin>>degree;
coff= new (nothrow) double[degree] ;
power=new (nothrow) double[degree];
//For memory exception
if(coff == NULL)
{
std::cout<<"\nInsufficent Memory \nExit_Faliure!!!\n\n";
exit(1);
}
for(int i=degree ; i>=0 ; i--)
{
*(power+i)=i;
//cout<<"\na["<<i<<"] = "<<*(power+i);
}
//input loop
for(int i=degree ; i>= 0 ; i--)
{
std::cout<<"\nEnter co-efficent of x^"<<i<<" : ";
cin>>*(coff+i);
}
//showing the equation
std::cout<<"\n\nEquation : ";
for(int i=degree ; i>=0 ; i--)
{
SetConsoleTextAttribute
(hConsole, FOREGROUND_GREEN | FOREGROUND_INTENSITY);
if(nod > degree)
{
cout<<" 0";
}
else if( *(coff+i) == 0)
{
continue;
}
else if(i==0)
{
std::cout<<*(coff+i);
std::cout<<" ";
}
else if(*(coff+i) == 1)
{
std::cout<<"x^"<<*(power+i);
std::cout<<" + ";
}
else if(i == 1)
{
std::cout<<*(coff+i)<<"x ";
std::cout<<" + ";
}
else
{
std::cout<<*(coff+i)<<"x^"<<*(power+i);
std::cout<<" + ";
}
nod++;
}
//derivatives
do
{
SetConsoleTextAttribute
(hConsole, FOREGROUND_RED | FOREGROUND_INTENSITY);
std::cout<<"\n\nEnter the number of derivatives you want to take(less than or equal to "<<degree<<") : ";
cin>>nofd;
}while(nofd>degree+1);
int o=1;//to put the dash sign to show derivative
for(int i=1 ; i<= nofd ; i++)//starting of full for loop
{
SetConsoleTextAttribute
(hConsole, FOREGROUND_RED | FOREGROUND_INTENSITY);
std::cout<<"\n\nGive the value of x to put in derviative of equation : ";
cin>>x;
SetConsoleTextAttribute
(hConsole, FOREGROUND_GREEN | FOREGROUND_INTENSITY);
std::cout<<"\n\nf";
for(int k=0 ; k < o ; k++)
{
std::cout<<"\'";
}
std::cout<<"(x) : ";
nod=0;
for(int j=degree ; j>=0 ; j--)//main working loop to find f'(x)
{
SetConsoleTextAttribute
(hConsole, FOREGROUND_GREEN | FOREGROUND_INTENSITY);
if(nod > degree)
{
cout<<" 0";
}
else if( *(coff+j) == 0)//if co-efficent is zero do not display anything
{
continue;
}
else if(*(power +j) <= 0 )//if powerer =0 do not display anything
{
cout<<" ";
continue;
}
else if(j == 0)//display only the co-efficent because the x^0=1
{
std::cout<<*(coff+j);
std::cout<<" ";
}
else if(*(power+j) == 1)
{
cout<<" + ";
std::cout<<(*(coff+j) * (*(power+j)));
fofx+=(*(coff+j) *= (*(power+j))) * (pow(x,*(power + j)-1));
}
else
{
if(j== degree)
{
cout<<"";
}
else
{
cout<<" + ";
}
std::cout<<(*(coff+j) * (*(power+j)))<<"x^"<<(*(power+j)-1);
fofx+=(*(coff+j) *= (*(power+j))) * (pow(x,*(power + j)-1));
}
*(power+j) -=1;
}//end of printing of f'(X) loop.main(working loop to find f'(x))
SetConsoleTextAttribute
(hConsole, FOREGROUND_BLUE | FOREGROUND_INTENSITY);
std::cout<<"\n(dy/dx)^"<<i<<" = "<<fofx;
o++;
fofx=0;
nod++;
}//ending of the full for loop
cout<<"\n\n";
std::cout<<"\nTo clear screen and find derivative again press \"f\"";
std::cout<<"\nTo find derivative again press \"a\"";
cin >>ct;
if(ct == 'a' || ct == 'A')
{
system("CLS");
}
else if(ct == 'f' || ct == 'F')
{
cout<<endl;
for(int p=0 ; p<80 ; p++)
cout<<"_";
cout<<endl;
for(int p=0 ; p<80 ; p++)
cout<<"*";
cout<<endl;
for(int p=0 ; p<80 ; p++)
cout<<"_";
ct='a';
}
}while(ct == 'A' || ct == 'a');
delete[] power;
delete[] coff;
}
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