添加异常处理

base/CMakeLists.txt

@@ -74,4 +74,5 @@ add_executable(error2 exception/error2.cpp)
 add_executable(error3 exception/error3.cpp)
 add_executable(exc_mean exception/exc_mean.cpp)
 add_executable(error5 exception/error5.cpp)
-add_executable(newexcp exception/newexcp.cpp)
+add_executable(newexcp exception/newexcp.cpp)
+add_executable(use_sales exception/use_sales.cpp)

base/exception/sales.cpp

@@ -7,6 +7,12 @@ using namespace std;
 
 Sales::bad_index::bad_index(int ix, const std::string &s) :std::logic_error(s),bi(ix){
 }
+Sales::Sales(int yy) {
+    year = yy;
+    for (int i = 0; i <MONTHS ; ++i) {
+        gross[i] = 0;
+    }
+}
 Sales::Sales(int yy, const double *gr, int n) {
     year =yy;
     int lim = (n < MONTHS)?n : MONTHS;

base/exception/sales.h

@@ -31,7 +31,7 @@ public:
 
     Sales(int yy, const double *gr, int n);
 
-    virtual ~Sales();
+    virtual ~Sales(){};
 
     int Year() const {
         return year;
@@ -64,7 +64,7 @@ public:
     };
     explicit LabeledSales(const std::string & lb = "none",int yy =0);
     LabeledSales(const std::string & lb,int yy,const double  * gr,int n);
-    virtual ~LabeledSales();
+    virtual ~LabeledSales(){};
     const std::string & Label() const{
         return label;
     }

base/exception/use_sales.cpp

@@ -0,0 +1,59 @@
+//
+// Created by nicemoe on 2021/9/12.
+//
+
+#include  <iostream>
+#include "sales.h"
+
+using namespace std;
+
+int main() {
+    double vals1[12]{
+        1220,1100,1122,2212,1232,2334,
+        2884,2393,3302,2922,3002,2533
+    };
+    double vals2[12]{
+        12,11,22,21,32,34,
+        28,29,33,29,32,35
+    };
+    Sales sales1(2011,vals1,12);
+    LabeledSales sales2("Blogstar",2012,vals2,12);
+    cout <<"First try block:\n";
+    try {
+        int i;
+        cout <<"Year = "<<sales1.Year() << endl;
+        for (i = 0; i < 12; ++i) {
+            cout << sales1[i] << ' ';
+            if (i % 6 == 5) cout << endl;
+        }
+        cout <<" Year = "<< sales2.Year() << endl;
+        cout <<" Label = "<< sales2.Label() << endl;
+        for (i = 0; i <= 12; ++i) {
+            cout << sales2[i] << ' ';
+            if (i % 6 == 5) cout << endl;
+        }
+        cout <<"End of try block 1.\n";
+    }catch (LabeledSales::nbad_index & bad){
+        cout << bad.what();
+        cout <<"Company: "<<bad.label_val() << endl;
+        cout <<"bad index: "<<bad.bi_val()<<endl;
+    }catch (Sales::bad_index & bad){
+        cout << bad.what();
+        cout <<"bad index: "<<bad.bi_val()<<endl;
+    }
+    cout<<"\nNext try block:\n";
+    try{
+        sales2[2] = 37.5;
+        sales1[20] = 23345;
+        cout <<"End of try block 2.\n";
+    }catch (LabeledSales::nbad_index & bad){
+        cout << bad.what();
+        cout <<"Company: "<<bad.label_val() << endl;
+        cout <<"bad index: "<<bad.bi_val()<<endl;
+    }catch (Sales::bad_index & bad){
+        cout << bad.what();
+        cout <<"bad index: "<<bad.bi_val()<<endl;
+    }
+    cout <<"done\n";
+    return 0;
+}