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Version 1;

Convert; base1 to base2.
2 <= base1,base2 <= 36.
Input through console or file:`input.txt`
Output through console or file:`output.txt`

Precautions;
Make sure data type can't exceeds(overflow).

Author: darshangouda

BaseConversionAlgorithm V1.cpp

@@ -0,0 +1,218 @@
+#include<iostream>
+#include<string.h>
+#include<stdio.h>
+#include<stdlib.h>
+#include<fstream>
+#include<ctime>
+
+using namespace std;
+
+char ch[16]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
+char ch1[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
+
+const long int size1=1000000;//4094 IS FIX FOR CHAR
+char instring[size1*2];
+unsigned int process[3][size1]={0};
+//100000 digits of decimal to hex 397 seconds
+//168 FFF->output from randomDECIMAL->INPUT
+//168
+void dis(long int n,long int f=0,long int k1=0,long int num=0)
+{
+    long int k;
+    if(k1!=0 && num != 0)
+     cout<<k1<<"-"<<n+1<<"-|";
+        for(k=n;k>=0;k--)
+         cout<<ch1[process[0][k]];
+         if(!(f == 0 && process[2][0] ==0))
+         {cout<<".";
+         for(k=0;k<=f;k++)
+         cout<<ch1[process[2][k]];
+         }
+         cout<<endl;
+}
+
+int main()
+{
+    fstream input,output;
+    clock_t start;
+    double duration;
+    long int rows=size1,trows;//int n=sizeof(process[0])/2;
+    long int j,i,k,m=0,m1=0,l,p,o,dec;
+    long int base1,base2,nbase2,ilen=0,flen=0,pos,f1,flimit=100;
+    int choice=0,temp,numtemp,i2,save,value=0,j1;
+    long int dd=0,tr=0,allzero=0;
+    base1=10;
+    base2=16;
+    trows=rows;
+    save=0;
+    begining:
+        //cout<<"size"<<size<<endl;
+        rows=trows;
+         {  for(p=0;p<rows;p++){instring[p]=process[0][p]=process[1][p]=process[2][p]=0;}}
+
+
+             cout<<"________________________________________________________________________________________________________________"<<endl;
+            cout<<"                 DATA REPRESENTATION"<<endl;
+            cout<<"1.CONVERT A (BASE1="<<base1<<") TO (BASE2="<<base2<<") \n ( FRACTION LIMIT ="<<flimit<<"   SAVE OUTPUT=";
+                if(save==1)
+                {
+                  cout<<"YES"<<endl;
+                }
+                else
+                    cout<<"NO"<<endl;
+            cout<<"2.CHANGE THE BASE , FRACTION LIMIT & SAVING OUTPUT?"<<endl;
+
+           cout<<"3.CLEAR SCREEN "<<endl;
+           cout<<"4.HELP "<<endl;
+           cout<<"5.EXIT "<<endl;
+           cout<<"ENTER YOUR CHOICE =";
+           cin>>choice;
+            if(choice==1)
+            {
+                goto case1_start;
+            }
+            else if (choice==2)
+            {
+                cout<<"BASE1 = ";
+                cin>>base1;
+                cout<<"BASE2 = ";
+                cin>>base2;
+                cout<<"FRACTION LIMIT = ";
+                cin>>flimit;
+                cout<<"1.SAVE OUTPUT IN FILE (YES =1  IF NO = 0 )) = ";
+                cin>>save;
+                goto begining;
+            }
+            else if (choice==3)
+            { system("cls");
+              goto begining;
+            }
+           else if(choice ==4)
+           { cout<<"  *.OUTPUT AUTOMATICALLY SAVED IN FILE \"output.txt\" IF YOU SET THE OPTION   (NOTE: NO NEED TO CREATE FILE)"<<endl;
+             cout<<"  *.BEFORE CHOOOSING OPTION(1.2.INPUT THROUGH FILE) INPUT SHOULD BE SAVED IN FILE \"input.txt\"  "<<endl;
+             goto begining;
+           }
+           else if(choice ==5)
+           {
+             exit(0);
+           }
+            else if(choice> 6 || choice <=0)
+            {
+                cout<<"INVALID CHOICE "<<endl;
+                goto begining;
+            }
+case1_start:
+
+
+     cout<<"      1.1.INPUT THROUGH CONSOLE   1.2.INPUT THROUGH FILE"<<endl;
+
+     cout<<"      ENTER YOUR CHOICE = ";
+     cin>>choice;
+     if(choice==1)
+     {  cout<<"ENTER THE  NUMBER (base)"<<base1<<endl;
+         cin>>instring;}
+     else if(choice==2)
+     {
+        input.open("input.txt",ios::in);
+        input>>instring;
+        cout<<instring<<endl;
+        input.close();
+     }
+     else
+        {cout<<"INVALID CHOICE RE-ENTER"<<endl;
+        goto case1_start;
+        }
+        //strrev(instring);
+        ilen=strlen(instring);
+        cout<<"LENGTH ="<<ilen<<endl;
+     if(ilen > sizeof(instring))
+     {
+         cout<<" STRING SIZE LIMIT IS = "<<sizeof(instring)<<endl;
+         goto case1_start;
+     }
+for(p=0;p<ilen;p++)
+ {
+     if(instring[p]=='.')
+      break;
+ }
+ for(i=0;i<ilen;i++)
+  {
+      if(instring[i]>57)
+        instring[i]=instring[i]-7;
+        instring[i]=instring[i]-48;
+  }
+  k=0;
+  for(i=ilen-1;i>p;i--)
+  {
+      process[1][k]=instring[i];
+      k++;
+  }
+dec=1;
+cout<<"please wait(processiong ......) "<<endl;
+start = std::clock();
+flen=ilen-p;
+ilen=p;
+dd=0;
+f1=-1;
+nbase2=base2-1;
+for(k=0;k<ilen;k++)
+{                 for(p=0;(process[0][p]*=base1),p<dec;p++);
+                  process[0][0]+=instring[k];
+                  for(i=0;dec>i;i++)
+                       {     i2=i;
+                                  while(process[0][i2] > nbase2)
+                                  {
+                                   if(dd<i2){dd=i2;}
+                                    process[0][i2+1]+=process[0][i2]/base2;
+                                   process[0][i2]%=base2;
+                                  i2++;
+                                 }
+                       }
+                       dec=dd+2;
+//dis(dec-1);
+}
+do
+{                allzero=0;
+                  for(p=0;(process[1][p]*=base2),p<flen;p++);
+                  for(i=0;flen-1>i;i++)
+                       {
+                                    process[1][i+1]+=process[1][i]/base1;
+                                   process[1][i]%=base1;
+                       }
+                process[2][++f1]=process[1][flen-1];
+                //dis(dec-1,f1);
+                process[1][flen-1]=0;
+               for(p=0;p<flen;p++){ if(process[1][p]!=0 && f1 < flimit-1){ allzero=1; break; } }
+}while(allzero==1);
+duration = ( std::clock() - start ) / (double) CLOCKS_PER_SEC;
+        pos=0;
+         for(p=0;p<rows;p++)
+         {
+                 if(process[0][p]>0)
+                  pos=p;
+         }
+    cout<<endl<<"EQUIVALENT TO (base)"<<base2<<endl;
+    dis(pos,f1);
+    if(save==1)
+    {      for(i=0;i<ilen;i++)
+               {
+               instring[i]=0;
+               }
+            p=0;
+         for(i=pos;i>=0;i--)
+         {instring[p]=ch[process[0][i]];p++;}
+          if(!(f1 == 0 && process[2][0] ==0))
+         { instring[p]='.';
+          for(k=0;k<=f1;k++)
+          { p++;
+             instring[p]=ch[process[2][k]];
+          }
+       }
+        output.open("output.txt",ios::out);
+        output<<instring;
+        output.close();
+    }
+    std::cout<<"TIME TAKEN FOR CONVERTION "<< duration <<endl;
+    goto begining;
+    return 0;
+}