C++ try/catch語句

在C++編程中，使用try/catch語句執行異常處理。 C++ try塊用於放置可能發生異常的代碼。catch塊用於處理異常。

沒有try/catch的示例

#include <iostream>
using namespace std;
float division(int x, int y) {
   return (x/y);
}
int main () {
   int i = 50;
   int j = 0;
   float k = 0;
      k = division(i, j);
      cout << k << endl;
   return 0;
}

執行上面代碼得到以下結果 -

Floating point exception (core dumped)

C++ try/catch示例

#include <iostream>
using namespace std;
float division(int x, int y) {
   if( y == 0 ) {
      throw "Attempted to divide by zero!";
   }
   return (x/y);
}
int main () {
   int i = 25;
   int j = 0;
   float k = 0;
   try {
      k = division(i, j);
      cout << k << endl;
   }catch (const char* e) {
      cerr << e << endl;
   }
   return 0;
}

執行上面代碼，得到以下結果 -

Attempted to divide by zero!