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  1. #include<iostream>
  2. #include<cmath>
  3.  
  4. using namespace std;
  5.  
  6. int fun(int a){
  7.     if(a<=9)return a;
  8.     int i,s=0;
  9.     for(i=0;;i++){
  10.         s+=(i==0)?1:((pow(10,i)-pow(10,i-1))*i);
  11.         if(a<=s)
  12.         break;
  13.     }
  14.     int k=a-s+((pow(10,i)-pow(10,i-1))*i);
  15.     int no=floor((float)k/i);
  16.     int val=pow(10,i-1)-pow(10,i-2);
  17.     for(;no>0;no--)
  18.         val++;
  19.     int c=k%i;
  20.  
  21.     for(;c>=0;c--){
  22.         k=val%10;
  23.         val=val/10;
  24.     }
  25.     return k;
  26. }
  27.  
  28. main(){
  29.     int a;
  30.     cout<<"enter index:"<<endl;
  31.     cin>>a;
  32.     cout<<"digit is:"<<fun(a)<<endl;
  33. }
Success #stdin #stdout 0s 2856KB
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stdout
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enter index:
digit is:9
https://ideone.com/coIv3I
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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