Este pequeno programa gera números grandes em stdout, a partir da linha de comando.

Compilando:

$ g++ numbers_asciiart.cpp -o numbers_asciiart

Executando:

$ ./numbers_asciiart 1234567890

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Esconder código-fonte

#include <iostream>
#include <vector>
#include <cstring>
using namespace std;

const char BIGDIGITS[10][7][6] =
            {{"  0  ",
              " 0 0 ", 
              "0   0", 
              "0   0", 
              "0   0", 
              " 0 0 ", 
              "  0  "},
             {"  1  ", 
              " 11  ", 
              "  1  ", 
              "  1  ", 
              "  1  ", 
              "  1  ", 
              " 111 "},
             {" 222 ", 
              "2   2", 
              "2  2 ", 
              "  2  ", 
              " 2   ", 
              "2    ", 
              "22222"},
             {" 333 ", 
              "3   3", 
              "    3", 
              "  33 ", 
              "    3", 
              "3   3", 
              " 333 "},
             {"   4 ", 
              "  44 ", 
              " 4 4 ", 
              "4  4 ", 
              "44444", 
              "   4 ", 
              "   4 "},
             {"55555", 
              "5    ", 
              "5    ", 
              " 555 ", 
              "    5", 
              "5   5", 
              " 555 "},
             {" 666 ", 
              "6    ", 
              "6    ", 
              "6666 ", 
              "6   6", 
              "6   6", 
              " 666 "},
             {"77777",
              "    7", 
              "   7 ", 
              "  7  ", 
              " 7   ", 
              "7    ", 
              "7    "},
             {" 888 ",
              "8   8", 
              "8   8", 
              " 888 ", 
              "8   8", 
              "8   8", 
              " 888 "},
             {" 9999", 
              "9   9", 
              "9   9", 
              " 9999", 
              "    9", 
              "    9", 
              "    9"}};

void printdigits(vector<int> * array) {
    for (int linha=0; linha<7;++linha) {
        for (vector<int>::size_type i = 0;i < array->size();++i) {
            cout << BIGDIGITS[array->at(i)][linha] << "  ";
        }
        cout << endl;
        cout.flush();
    }
    return;
}

int main(int argc, char* argv[]) {
    vector<int> * numeros;
    numeros = new (nothrow) vector<int>;
    for (int c=1; c<argc; ++c) {
        for (int i=0; i < strlen(argv[c]); ++i) {
            numeros->push_back(argv[c][i] - 48);
        }
        printdigits(numeros);
        numeros->clear();
    }
    delete numeros;
    return 0;
}

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