Add 2023-2/L04 solution

1 files changed, 257 insertions, 0 deletions

diff --git a/2023-2/L04/mitsuo/fun.cpp b/2023-2/L04/mitsuo/fun.cpp
new file mode 100644
index 0000000..6e7ff38
--- /dev/null
+++ b/2023-2/L04/mitsuo/fun.cpp
@@ -0,0 +1,257 @@
+#include <iostream>
+#include <fstream>
+#include <iomanip>
+#include <cstring>
+#include <algorithm>
+#include "fun.hpp"
+
+using namespace std;
+
+void cargaproductos(void *& productos) {
+    ifstream in("../Productos2.csv");
+    if (!in) {
+        cerr << "Error: no se puedo abrir archivo\n";
+    }
+    char code[MAXLEN];
+    char desc[MAXLEN];
+    double price;
+    char uses_credit;   // S|N (yes or no)
+
+    // "metodo exacto"
+    void * productos_tmp[MAX];
+
+    int i;
+    for (i = 0; true; i++) {
+        in.getline(code, MAXLEN, ',');
+        in.getline(desc, MAXLEN, ',');
+        in >> price; in.get();
+        in >> uses_credit; in.get();
+        if (!in) {
+            break;
+        }
+        void ** producto = new void * [4];
+        // 0: code, 1: desc, 2: price, 3: uses_credit
+        producto[0] = new char [strlen(code) + 1]; strcpy((char *) producto[0], code);
+        producto[1] = new char [strlen(desc) + 1]; strcpy((char *) producto[1], desc);
+        producto[2] = new double {price};
+        producto[3] = new char {uses_credit};
+        productos_tmp[i] = producto;
+    }
+    productos_tmp[i++] = NULL;
+    int n = i;
+    productos = new void * [n]; 
+    for (i = 0; i < n; i++) {
+        ((void **) productos)[i] = productos_tmp[i];
+    }
+}
+
+void imprimeproductos(void * productos) {
+    cout << "PRODUCTOS: \n";
+    void ** ps = (void **) productos;
+    for (int i = 0; ps[i]; i++) {
+        void ** p = (void **) ps[i];
+        cout << left;
+        cout << setw(12) << (char *) p[0];
+        cout << setw(64) << (char *) p[1];
+        cout << right << fixed << setprecision(2);
+        cout << setw(8) << * (double *) p[2];
+        cout << setw(8) << * (char *) p[3];
+        cout << '\n';
+    }
+}
+
+void cargaclientes(void *& clientes) {
+    ifstream in("../Clientes2.csv");
+    if (!in) {
+        cerr << "Error: no se puedo abrir archivo\n";
+    }
+    int     dni;
+    char    name[MAXLEN];
+    char    phonenumber[MAXLEN];    // not used
+    void *  pedidos = NULL;
+    double  credit;
+
+    // "metodo exacto"
+    void * clientes_tmp[MAX];
+
+    int i;
+    for (i = 0; true; i++) {
+        in >> dni; in.get();
+        in.getline(name, MAXLEN, ',');
+        in.getline(phonenumber, MAXLEN, ',');
+        in >> credit; in.get();
+        if (!in) {
+            break;
+        }
+        void ** cliente = new void * [4];
+        // 0: dni, 1: name, 2: pedidos, 3: credit
+        cliente[0] = new int {dni};
+        cliente[1] = new char [strlen(name) + 1]; strcpy((char *) cliente[1], name);
+        cliente[2] = new void * {NULL};
+        cliente[3] = new double {credit};
+        clientes_tmp[i] = cliente;
+    }
+    clientes_tmp[i++] = NULL;
+    int n = i;
+    clientes = new void * [n]; 
+    for (i = 0; i < n; i++) {
+        ((void **) clientes)[i] = clientes_tmp[i];
+    }
+}
+
+void imprimeclientes(void * clientes) {
+    cout << "CLIENTES: \n";
+    void ** cs = (void **) clientes;
+    for (int i = 0; cs[i]; i++) {
+        void ** c = (void **) cs[i];
+        cout << left;
+        cout << setw(12) << * (int *) c[0];
+        cout << setw(64) << (char *) c[1];
+
+        // void ** pedidos = (void **) c[2];
+
+        cout << right << fixed << setprecision(2);
+        cout << setw(8) << * (double *) c[3];
+        cout << '\n';
+    }
+}
+
+void cargapedidos(void *& productos, void * clientes) {
+    ifstream in("../Pedidos2.csv");
+    if (!in) {
+        cerr << "Error: no se puedo abrir archivo\n";
+    }
+    char    code[MAXLEN];           // product code
+    int     dni;
+    int     qty;
+
+    int i;
+    for (i = 0; true; i++) {
+        in.getline(code, MAXLEN, ',');
+        in >> dni; in.get();
+        in >> qty; in.get();
+        if (!in) {
+            break;
+        }
+
+        // 1. Search the client
+        void ** c = busca_cliente(clientes, dni);
+        // 0: dni, 1: name, 2: pedidos, 3: credit
+        double & credit = * (double *) c[3];
+        void *& pedidos = c[2];
+        if (!pedidos) {
+            // "metodo exacto": first use a buffer of certain size, then trim it.
+            pedidos = new void * [MAX];
+            ((void **) pedidos)[0] = NULL;
+        }
+
+        // 2. Before adding the pedido, a check must be done
+        void ** p = busca_producto(productos, code);
+        // 0: code, 1: desc, 2: price, 3: uses_credit
+        double price = * (double *) p[2];
+        char uses_credit = * (char *) p[3];
+        double total_cost = qty * price;
+        if (uses_credit == 'S') {
+            if (credit < total_cost) {
+                // not enough credit
+                continue;
+            }
+            credit -= total_cost;
+        }
+        
+        void ** pedido = new void * [3];
+        // 0: product code, 1: order qty, 2: total (qty * price)
+        pedido[0] = new char [strlen(code) + 1]; strcpy((char *) pedido[0], code);
+        pedido[1] = new int {qty};
+        pedido[2] = new double {total_cost};
+        agrega_pedido(pedidos, pedido);        // appends pedido to the list
+    }
+
+    // trim     TODO
+    // for (i = 0; i < n; i++) {
+    //     ((void **) clientes)[i] = clientes_tmp[i];
+    // }
+}
+
+void ** busca_cliente(void * clientes, int dni) {
+    void ** cs = (void **) clientes;
+    for (int i = 0; cs[i]; i++) {
+        void ** c = (void **) cs[i];
+        int c_dni = * (int *) c[0];
+        if (c_dni == dni) {
+            return c;
+        }
+    }
+    return NULL;
+}
+
+void ** busca_producto(void * productos, char * code) {
+    void ** ps = (void **) productos;
+    for (int i = 0; ps[i]; i++) {
+        void ** p = (void **) ps[i];
+        char * p_code = (char *) p[0];
+        if (strcmp(p_code, code) == 0) {
+            return p;
+        }
+    }
+    return NULL;
+}
+
+void agrega_pedido(void * pedidos, void * pedido) {
+    void ** peds = (void **) pedidos;
+    int i;
+    for (i = 0; i < MAX && peds[i]; i++)
+        ;
+    if (i == MAX) {
+        cerr << "ERROR: STACK OVERFLOW\n";
+    }
+    peds[i++] = pedido;
+    peds[i] = NULL;
+}
+
+void imprimereporte(void * clientes) {
+    ofstream out("ReporteDePedidos.txt");
+    if (!out) {
+        cerr << "Error: no se pudo abrir archivo para reporte\n";
+    }
+    void ** cs = (void **) clientes;
+    for (int i = 0; cs[i]; i++) {
+        void ** c = (void **) cs[i];
+        // 0: dni, 1: name, 2: pedidos, 3: credit
+        int dni = * (int *) c[0];
+        char * name = (char *) c[1];
+        void ** pedidos = (void **) c[2];
+        double credit = * (double *) c[3];
+        out << 
+            "===========================================================================================================\n"
+            "DNI         Nombre                                                          Credito\n"
+            ;
+        out << left;
+        out << setw(12) << dni;
+        out << setw(64) << name;
+        out << right << fixed << setprecision(2);
+        out << setw(8) << credit;
+        out << '\n';
+
+        out << 
+            "-----------------------------------------------------------------------------------------------------------\n"
+            "Pedidos atendidos:\n"
+            "-----------------------------------------------------------------------------------------------------------\n"
+            "Codigo      Cantidad    Total\n"
+            "-----------------------------------------------------------------------------------------------------------\n"
+            ;
+        for (int j = 0; pedidos[j]; j++) {
+            void ** pedido = (void **) pedidos[j];
+            // 0: product code, 1: order qty, 2: total (qty * price)
+            char * code = (char *) pedido[0];
+            int qty = * (int *) pedido[1];
+            double total_cost = * (double *) pedido[2];
+
+            out << left;
+            out << setw(12) << code;
+            out << setw(12) << qty;
+            out << setw(12) << total_cost;
+            out << '\n';
+        }
+    }
+}
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