Language: C++

#include <bits/stdc++.h>
using namespace std;

#define inf 1072114514
#define llinf 4154118101919364364
#define mod 1000000007
#define pi 3.1415926535897932384


int round(int a,int b){if((a%b)*2 >= b){return (a/b)+1;}return a/b;} 
int gcd(int a,int b){int c;while(b!=0){c=a%b;a=b;b=c;}return a;}    //最大公約数
int lcm(int a,int b){int c=gcd(a,b);a/=c;return a*b;}     //最小公倍数
int nCr(int a,int b){int i,r=1;for(i=1;i<=b;i++){r*=(a+1-i);r/=i;}return r;} //コンビネーション
int nHr(int a,int b){return nCr(a+b-1,b);}       // 重複組み合わせ
int fact(int a){int i,r=1;for(i=1;i<=a;i++){r*=i;}return r;}  //階乗
int pow(int a,int b){int i,r=1;for(i=1;i<=b;i++){r*=a;}return r;} // a~bまでの階乗
int dsum(int x){int r=0;while(x){r+=(x%10);x/=10;}return r;}   //数字の各位の和
int dsumb(int x,int b){int r=0;while(x){r+=(x%b);x/=b;}return r;}  // b進数の各位の和？
int sankaku(int x){return ((1+x)*x)/2;} //三角数 xまでの和

//以下long long ver
long long llmax(long long a,long long b){if(a>b){return a;}return b;}
long long llmin(long long a,long long b){if(a<b){return a;}return b;}
long long llzt(long long a,long long b){return llmax(a,b)-llmin(a,b);}
long long llround(long long a,long long b){if((a%b)*2 >= b){return (a/b)+1;}return a/b;}
long long llceil(long long a,long long b){if(a%b==0){return a/b;}return (a/b)+1;}
long long llgcd(long long a,long long b){long long c;while(b!=0){c=a%b;a=b;b=c;}return a;}
long long lllcm(long long a,long long b){long long c=llgcd(a,b);a/=c;return a*b;}
long long llnCr(long long a,long long b){long long i,r=1;for(i=1;i<=b;i++){r*=(a+1-i);r/=i;}return r;}
long long llnHr(long long a,long long b){return llnCr(a+b-1,b);}
long long llfact(long long a){long long i,r=1;for(i=1;i<=a;i++){r*=i;}return r;}
long long llpow(long long a,long long b){long long i,r=1;for(i=1;i<=b;i++){r*=a;}return r;}
long long lldsum(long long x){long long r=0;while(x){r+=(x%10);x/=10;}return r;}
long long lldsumb(long long x,long long b){long long r=0;while(x){r+=(x%b);x/=b;}return r;}
long long llsankaku(long long x){return ((1+x)*x)/2;}

//double
double dbmax(double a,double b){if(a>b){return a;}return b;}
double dbmin(double a,double b){if(a<b){return a;}return b;}
double dbzt(double a,double b){return dbmax(a,b)-dbmin(a,b);}


typedef pair<int, int> ii;
typedef long long ll;
typedef vector<ll> vll;
typedef pair<ll,ll> pll;
#define forr(i,a,b) ; for(int i=(a); i<(b); i++)
#define clean(arr,val) memset(arr,val,sizeof(arr))
#define forn(i,n) forr(i,0,n)
#define PB push_back
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<pll> vpll;
const int dx[8] = {1, 0, -1, 0, 1, -1, -1, 1};
const int dy[8] = {0, 1, 0, -1, 1, 1, -1, -1};

 
/*CODE START HERE*/
int main() {
  int h,w;
  cin >> h >> w;
  string s[h];
  forn(i,h){
    cin >> s.at(i);
  }
  forn ( i,h){
    forn(j,w){
      if ( s.at(i).at(j)=='#') continue ;
      int  num = 0;
      forn(k,8){
        int nx = (j+dx.at(k));
        int ny = (i+dy.at(k));
        
        if ( d.at(ny).at(nx) == '#'){
          num ++ ;
        }
        
      }
      s.at(ny).at(nx)= char(num + '0') ;
    }
  }
  forn(i,h){
    cout<< s(i) << endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:64:14: error: request for member 'at' in 's', which is of non-class type 'std::string [h]' {aka 'std::__cxx11::basic_string<char> [h]'}
   64 |     cin >> s.at(i);
      |              ^~
a.cc:68:14: error: request for member 'at' in 's', which is of non-class type 'std::string [h]' {aka 'std::__cxx11::basic_string<char> [h]'}
   68 |       if ( s.at(i).at(j)=='#') continue ;
      |              ^~
a.cc:71:24: error: request for member 'at' in 'dx', which is of non-class type 'const int [8]'
   71 |         int nx = (j+dx.at(k));
      |                        ^~
a.cc:72:24: error: request for member 'at' in 'dy', which is of non-class type 'const int [8]'
   72 |         int ny = (i+dy.at(k));
      |                        ^~
a.cc:74:14: error: 'd' was not declared in this scope
   74 |         if ( d.at(ny).at(nx) == '#'){
      |              ^
a.cc:79:9: error: request for member 'at' in 's', which is of non-class type 'std::string [h]' {aka 'std::__cxx11::basic_string<char> [h]'}
   79 |       s.at(ny).at(nx)= char(num + '0') ;
      |         ^~
a.cc:79:12: error: 'ny' was not declared in this scope; did you mean 'yn'?
   79 |       s.at(ny).at(nx)= char(num + '0') ;
      |            ^~
      |            yn
a.cc:79:19: error: 'nx' was not declared in this scope; did you mean 'dx'?
   79 |       s.at(ny).at(nx)= char(num + '0') ;
      |                   ^~
      |                   dx
a.cc:83:13: error: 's' cannot be used as a function
   83 |     cout<< s(i) << endl;
      |            ~^~~