C++ program to Zoom digits of an integer

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

// Function prototype for all printing digit functions
void print_zero();
void print_one();
void print_two();
void print_three();
void print_four();
void print_five();
void print_six();
void print_seven();
void print_eight();
void print_nine();
void zoom_digit(int number); 

// Function to print digit '0'
void print_zero() {
   for (int i=0; i<5; i++) {
      for (int j=0; j<5; j++) {
         if (i==0 || i==4 || j==0 || j==4)
            cout << '#';
         else
            cout << " ";
      }
      cout << endl;
   }
}

// Function to print digit '1'
void print_one() {
   for (int i=0; i<5; i++) {
      for (int j=0; j<5; j++) {
         if (j==2 || (i==1 && j==1) || i==4)
            cout << '#';
         else
            cout << " ";
      }
      cout << endl;
   }
}

// Function to print digit '2'
void print_two() {
   for (int i=0; i<5; i++) {
      for (int j=0; j<5; j++) {
         if (i==0 || i==2 || i==4 || (i==1 && j==0) || (i==3 && j==4))
            cout << '#';
         else
            cout << " ";
      }
      cout << endl;
   }
}

// Function to print digit '3'
void print_three() {
   for (int i=0; i<5; i++) {
      for (int j=0; j<5; j++) {
         if (i==0 || i==2 || i==4 || j==4)
            cout << '#';
         else
            cout << " ";
      }
      cout << endl;
   }
}

// Function to print digit '4'
void print_four() {
   for (int i=0; i<5; i++) {
      for (int j=0; j<5; j++) {
         if (j==4 || i==2 || (j==0 && (i==0 || i==1)))
            cout << '#';
         else
            cout << " ";
      }
      cout << endl;
   }
}

// Function to print digit '5'
void print_five() {
   for (int i=0; i<5; i++) {
      for (int j=0; j<5; j++) {
         if (i==0 || i==2 || i==4 || (j==0 && i==1) || (j==4 && i==3))
            cout << '#';
         else
            cout << " ";
      }
      cout << endl;
   }
}

// Function to print digit '6'
void print_six() {
   for (int i=0; i<5; i++) {
      for (int j=0; j<5; j++) {
         if (i==0 || i==2 || i==4 || (j==0 && (i==1 || i==3)) || (j==4 && i==3))
            cout << '#';
         else
            cout << " ";
      }
      cout << endl;
   }
}

// Function to print digit '7'
void print_seven() {
   for (int i=0 ; i<5; i++) {
      for (int j=0 ; j<5; j++) {
         if (i==0 && (j!=4) || (i==2 && (j==2 || j==4)) || j==3)
            cout << '#';
         else
            cout << " ";
      }
      cout << endl;
   }
}

// Function to print digit '8'
void print_eight() {
   for (int i=0; i<5; i++) {
      for (int j=0; j<5; j++) {
         if (i==0 || i==2 || i==4 || (j==0 && (i==1 || i==3)) || (j==4 && (i==1 || i==3)))
            cout << '#';
         else
            cout << " ";
      }
      cout << endl;
   }
}

// Function to print digit '9'
void print_nine() {
   for (int i=0; i<5; i++) {
      for (int j=0; j<5; j++) {
         if ( i==0 || i==2 || j==4 || (i==1 && j==0))
            cout << '#';
         else
            cout << " ";
      }
      cout << endl;
   }
}

// Function to process and print each digit of the number
void zoom_digit(int number) {
   stringstream ss;
   ss << number;
   string str = ss.str();

   for (int k=0; k<str.length(); k++) {
      cout << endl;
      switch(str[k]-'0'){
         case 0: print_zero(); continue;
         case 1: print_one(); continue;
         case 2: print_two(); continue;
         case 3: print_three(); continue;
         case 4: print_four(); continue;
         case 5: print_five(); continue;
         case 6: print_six(); continue;
         case 7: print_seven(); continue;
         case 8: print_eight(); continue;
         case 9: print_nine(); continue;
      }
   }
}

// Main function to print Zoom digit
int main() {
   long long number = 2546;
   zoom_digit(number);
   return 0;
}

#include<iostream>
#include<vector>
#include<string>
#include<functional>
using namespace std;

// Each digit printer returns a 5x5 character matrix 
// vector of string
vector<string> zero() {
   return {
       "#####",
       "#   #",
       "#   #",
       "#   #",
       "#####"
   };
}

vector<string> one() {
   return {
       "  #  ",
       " ##  ",
       "  #  ",
       "  #  ",
       "#####"
    };
}

vector<string> two() {
   return {
       "#####",
       "    #",
       "#####",
       "#    ",
       "#####"
   };
}

vector<string> three() {
   return {
       "#####",
       "    #",
       "#####",
       "    #",
       "#####"
   };
}

vector<string> four() {
   return {
       "#   #",
       "#   #",
       "#####",
       "    #",
       "    #"
   };
}

vector<string> five() {
   return {
       "#####",
       "#    ",
       "#####",
       "    #",
       "#####"
   };
}

vector<string> six() {
    return {
        "#####",
        "#    ",
        "#####",
        "#   #",
        "#####"
    };
}

vector<string> seven() {
   return {
       "#####",
       "    #",
       "   # ",
       "  #  ",
       "  #  "
   };
}

vector<string> eight() {
   return {
       "#####",
       "#   #",
       "#####",
       "#   #",
       "#####"
   };
}

vector<string> nine() {
   return {
       "#####",
       "#   #",
       "#####",
       "    #",
       "#####"
   };
}

// digit printer using vector<string>
void zoom_digits(long long number) {
   vector<function<vector<string>()>> digitMap = {
       zero, one, two, three, four,
       five, six, seven, eight, nine
   };

   string digits = to_string(number);
   vector<vector<string>> bigDigits;

   // Convert each digit into its 5x5 representation
   for (char ch : digits) {
       int d = ch - '0';
       bigDigits.push_back(digitMap[d]());
   }

   // Print all digits line by line
   for (int row = 0; row < 5; ++row) {
       for (const auto& digit : bigDigits) {
           // space between digits
           cout << digit[row] << "  ";  
       }
       cout << endl;
   }
}

int main() {
   // given number
   long long number = 5293;
   zoom_digits(number);
   return 0;
}