C++ function parameter error handling practice

C Function parameter error handling can use the following techniques in practice: Exceptions: Use try-catch blocks to catch exceptions and provide error information. Assertions: Use assertions to check parameter validity and terminate the program on failure and print an error message. Error code: The function returns an error code to indicate an error condition.

C Function parameter error handling practice

In software development, function parameter error handling is crucial, it can prevent Invalid or inconsistent input can cause a program to crash or behave unexpectedly. C provides a variety of techniques for efficiently handling function parameter errors.

1. Using Exceptions

C provides the exception class to handle error situations. We can use the try-catch block to catch exceptions in the function:

void function(int n) {
  try {
    if (n < 0) throw std::invalid_argument("n must be non-negative.");

    // 函数逻辑...
  } catch (const std::invalid_argument& e) {
    std::cerr << "Error: " << e.what() << std::endl;
  }
}

2. Use assertions

Assertions can check the validity of function parameters . If the assertion fails, it will terminate the program and print an error message.

void function(int n) {
  assert(n >= 0);

  // 函数逻辑...
}

3. Return error code

The function can return an error code to indicate an error situation. For example:

int divide(int a, int b) {
  if (b == 0) return -1;  // 错误码：除数为零

  return a / b;
}

Practical case

The following is an example of using exceptions to verify function parameters:

// 计算圆的面积
double area_circle(double radius) {
  if (radius < 0) throw std::invalid_argument("Radius must be non-negative.");

  return M_PI * radius * radius;
}

int main() {
  try {
    double result = area_circle(-2.5);  // 触发异常
  } catch (const std::invalid_argument& e) {
    std::cerr << "Error: " << e.what() << std::endl;
  }

  return 0;
}

Output:

Error: Radius must be non-negative.

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