if_ln.cpp

#include "header.h"

using namespace std;

int ln_token=0;
int all_l=0;

void all_ln()
{
    all_l++;
}
bool ln_function(string equ)
{
    char* if_ln=strstr(equ.c_str(),"ln");

    if(if_ln!=nullptr)
        return true;
    else return false;
}
void ln_null()
{
    all_l = 0;
}

string if_ln(string equ)
{
    string ans4="";
    string ans5="";

    char ln_chain[1000];
    int k,j=0;
    char ln_var;

    for(int i=0; i<equ.size(); i++)
    {
        if(equ[i]=='(' && i==0)
            continue;
        if(equ[i]=='(' )
        {
            if(equ[i+2]==')')
            {
                k=1;
                int n_type=char_type(equ[i+1]);
                int n_type2=char_type(equ[i+2]);
                if(n_type==1  )
                    ln_var=equ[i+1];
                else if(n_type==2)
                    ln_var='\0' ;
            }
            else
            {
                ln_chain[j] = equ[i];
                j++;
                ln_chain[j]= equ[i+1];
                j++;
            }
        }
        else if(j>0)
        {
            ln_chain[j] = equ[i+1];
            j++;
        }

        if(equ[i]==')' && equ[i-2] != '(')
            ln_chain[j] = '\0' ;
    }
    int ob=0,i;
    for( i=0;i<strlen(ln_chain);i++)
    {
        if(ln_chain[i]=='(')
            ob++;
        else break;
    }
    for(int j=i;j<=strlen(ln_chain);j++)
        ln_chain[j-ob]=ln_chain[j];

    bool trigono_track_ln=trigonometry_function(ln_chain);
    bool ln_track_ln=ln_function(ln_chain);
    bool sqrt_ln=root_function(ln_chain);
    bool exp_track_ln=exp_function(ln_chain);

    if( k != 1 && trigono_track_ln == false && ln_track_ln == false && exp_track_ln == false && sqrt_ln==false )
    {
        if(all_l>0)
        {
            int xl=0,yl=0;
            char cl='\0';

            cout<<"d/d";

            for(int i=0; i<equ.size(); i++)
            {
                if(equ[i] != '(' && yl==0)
                    continue ;
                else
                {
                    yl++;
                    xl=char_type(equ[i]);
                    if(xl==1)
                    {
                        cl=equ[i];
                        break;
                    }
                }
            }
            if(cl=='\0')
            {
                cl='x';
                cout<<cl<<" "<<"(";
            }
            else cout<<cl<<" "<<"(";

            cout<<ln_chain<<"/";
        }
        ans4 +="(";
        ans4 +=for_partition(ln_chain);

        ans4 +="/";
        for(int i=0; ln_chain[i] != '\0'; i++)
            ans4 +=ln_chain[i];
        if(all_l>0)
        {
            cout<<ln_chain;
            cout<<"\n\n\t\t\t    = ";
        }

    }
    else if(k==1 && trigono_track_ln == false && ln_track_ln == false && exp_track_ln == false && sqrt_ln==false)
    {
        if(ln_var == '\0')
        {
            ans4 = "0";
            return ans4;
        }
        else
        {
            ln_chain[0] = ln_var;
            ln_chain[1] = ')' ;
            ln_chain[2] = '\0';

            ans4 +="1/" ;
            ans4 +="(" ;
            for(int i=0; ln_chain[i]!='\0'; i++)
                ans4 += ln_chain[i];
        }
    }
    else if(trigono_track_ln || ln_track_ln  || exp_track_ln  || sqrt_ln ==true )
    {
        string  match=str_match(ln_chain);

        if(match=="e^")
        {
            if(all_l>0)
            {
                all_exp();
                cout<<" First of all, we have to differentiate the part inside e^().";
                cout<<"\n\n\t\t\tSo-\n\n\t\t\t   = ";
            }
            if(k==1)
            {
                for(int i=0; i<strlen(ln_chain); i++)
                {
                    if(ln_chain [i] == '(' && ln_chain[i+1]== ')' )
                    {
                        ln_chain[i+1] = ln_var;
                        ln_chain[i+2] =' )' ;
                        ln_chain[i+3]  = '\0' ;
                    }
                }
            }
            ans5+=if_exp(ln_chain);
            ans4+=ans5;
            if(all_l>0)
            {
                cout<<ans5;
                cout<<"\n\n\n\t\t\tFinally-\n\n\t\t\t    = ";
            }
        }
        else if(match=="sqrt")
        {

            if(all_l>0)
            {
                all_root();
                cout<<" First of all, we have to differentiate the part inside sqrt().";
                cout<<"\n\n\t\t\tSo-\n\n\t\t\t   = ";
            }
            if(k==1)
            {
                for(int i=0; i<strlen(ln_chain); i++)
                {
                    if(ln_chain [i] == '(' && ln_chain[i+1]== ')' )
                    {
                        ln_chain[i+1] = ln_var;
                        ln_chain[i+2] =' )' ;
                        ln_chain[i+3]  = '\0' ;
                    }
                }
            }
            ans5+=if_root(ln_chain);
            ans4+=ans5;
            if(all_l>0)
            {
                cout<<ans5;
                cout<<"\n\n\n\t\t\tFinally-\n\n\t\t\t    = ";
            }
        }
        else if(match=="ln")
        {
            cout<<" First of all, we have to differentiate the part inside ln().";
            cout<<"\n\n\t\t\tSo-\n\n\t\t\t   = ";
                 ans4 +=if_ln(ln_chain);
        }

        else
        {
            if(all_l>0)
            {
                all_trigon();
            }
            if(k==1)
            {
                for(int i=0; i<strlen(ln_chain); i++)
                {
                    if(ln_chain [i] == '(' && ln_chain[i+1]== ')' )
                    {
                        ln_chain[i+1] = ln_var;
                        ln_chain[i+2] =' )' ;
                        ln_chain[i+3]  = '\0' ;
                    }
                }
            }
            ans5 +=if_trigonometry(ln_chain);
            ans4 +=ans5;
            if(all_l>0)
            {
                cout<<ans5;
                cout<<"\n\n\n\t\t\tFinally-\n\n\t\t\t    = ";
            }

        }
        ans4+=" / ";
        for(int i=0; ln_chain[i]!='\0'; i++)
        {
            if(ln_chain[i]== '(' && i==0)
                continue;
            if(ln_chain[i]=='(' && ln_chain[i+1]=='(' )
                continue;
            ans4+= ln_chain[i];
        }
    }
    return ans4;
}