How to handle when a C++ function returns an exception?

In C, exceptions returned by functions are handled through try-catch blocks: try blocks contain code that may throw exceptions. The catch block contains exception handling code, performs cleanup operations and logs error information.

#How to deal with exceptions returned by C functions?

In C, functions can report errors by throwing exceptions. Exceptions are an error handling mechanism that allow functions to pass error information to the caller.

To handle function return exceptions, you need to use a try-catch block:

try {
  // 函数调用，可能会抛出异常
}
catch (exception& e) {
  // 异常处理代码
}

try The block contains code that may throw an exception, and # The ##catch block contains exception handling code. The exception handling code will perform cleanup operations and log error information as needed.

Practical case:

Consider the following function that returns an exception:

int divide(int numerator, int denominator) {
  if (denominator == 0) {
    throw runtime_error("除数不能为 0");
  }
  return numerator / denominator;
}

We can use the

try-catch block to handle it Exception returned by this function:

int main() {
  int numerator, denominator;
  cin >> numerator >> denominator;

  try {
    int result = divide(numerator, denominator);
    cout << "结果为：" << result << endl;
  }
  catch (exception& e) {
    cout << "除数不能为 0" << endl;
  }

  return 0;
}

When

denominator is 0, this program will print an error message and terminate the program.

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