Differences

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--- c:c_exception_handling [2017/10/12 10:24] – peter
+++ c:c_exception_handling [2020/07/15 09:30] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 ====== C - C++ Exception Handling ======
-[[C - C++ Exception Handling:Standard Exceptions|Standard Exceptions]]
+[[C - C++ Exception Handling:bad_alloc Exceptions|bad_alloc Exceptions]]
-<code cpp>
+[[C - C++ Exception Handling:Class Exceptions|Class Exceptions]]
-#include <iostream>
-using namespace std;
-int main()
-{
-  cout << "Start\n";
-  try {
-    cout << "Inside try block\n";
-    throw 1;                          // throw an error
-    cout << "This will not execute";
-  }
-  catch (int i) {                     // catch an error
-    cout << "Caught an exception -- value is: ";
-    cout << i << "\n";
-  }
-  cout << "End";
-  return 0;
-}
-</code>
+[[C - C++ Exception Handling:Derived Class Exceptions|Derived Class Exceptions]]
+[[C - C++ Exception Handling:Exceptions|Exceptions]]
-===== Multiple catch blocks =====
+[[C - C++ Exception Handling:Multiple catch blocks|Multiple catch blocks]]
-<code cpp>
-#include <iostream.h>
-int main ()
-{
-  try
-  {
-    char * mystring;
-    mystring = new char [10];
-    if (mystring == NULL)
-       throw "Allocation failure";
-    for (int n=0; n<=100; n++)
-    {
-      if (n>9)
-         throw n;
-      mystring[n]='a';
-    }
-  }
-  catch (int i)
-  {
-    cout << "index " << i << " is out of range" << endl;
-  }
-  catch (char * str)
-  {
-    cout << "Exception: " << str << endl;
-  }
-  return 0;
-}
-</code>
-===== Class exceptions =====
-<code cpp>
-#include <iostream>
-#include <cstring>
-using namespace std;
-class forgetcode
-{
-public:
-  char Error[80];
-  forgetcode() {
-    cout<<"Error has occured";
-  }
-  void display()
-  {
-    cout<<"\nPlease Enter a positve number";
-  }
-};
-int main()
-{
-  int i;
-  try {
-    cout << "Enter a positive number: ";
-    cin>>i;
-    if(i<0)
-      throw forgetcode();
-    else
-      cout<<"\nThe entered number is "<<i;
-  }
-  catch (forgetcode f) {
-    f.display();
-  }
-  return 0;
-}
-</code>
-===== Throwing Exception =====
-<code cpp>
-#include <iostream>
-#include <stdexcept>
-using std::cin;
-using std::cout;
-using std::endl;
-using std::runtime_error;
-class DivideByZeroException : public runtime_error
-{
-public:
-   DivideByZeroException::DivideByZeroException(): runtime_error( "attempted to divide by zero" ) {}
-};
-double quotient( int numerator, int denominator )
-{
-  throw DivideByZeroException(); // terminate function
-  return 0;
-}
-int main()
-{
-  try
-  {
-    double result = quotient( 1, 1 );
-    cout << "The quotient is: " << result << endl;
-  }
-  catch ( DivideByZeroException &divideByZeroException )
-  {
-    cout << "Exception occurred: " << divideByZeroException.what() << endl;
-  }
-  return 0;
-}
-</code>
+[[C - C++ Exception Handling:Standard Exceptions|Standard Exceptions]]
-===== Throw Types =====
+[[C - C++ Exception Handling:Throwing Exceptions|Throwing Exceptions]]
-<code cpp>
+[[C - C++ Exception Handling:Throwing Types|Throwing Types]]
-#include <iostream>
-using namespace std;
-// only throw ints, chars, and doubles
-void f(int val) throw(int, char, double)
-{
-  if(val==0)
-     throw val;
-  if(val==1)
-     throw 'a';
-  if(val==2)
-     throw 123.23;
-}
-int main()
-{
-  try{
-    f(0); // also, try passing 1 and 2 to f()
-  }
-  catch(int i) {
-    cout << "Caught an integer\n";
-  }
-  catch(char c) {
-    cout << "Caught char\n";
-  }
-  catch(double d) {
-    cout << "Caught double\n";
-  }
-  return 0;
-}
-</code>