What are the syntax rules for C++ functions?

The syntax format of C function is: returnType functionName(parameterList) {}, including three components: return type, function name and parameter list. An example of a specific function call is the factorial function that calculates factorial. The factorial result is obtained through loop accumulation.

C function syntax

Grammar format:

returnType functionName(parameterList) {
  // 函数体
  // 返回值（如果适用）
}

Among them:

• returnType: Function return type, which can be any data type or void (no return value).
• functionName: Function name, following C naming rules.
• parameterList: Function parameter list, separated by commas. Each parameter includes data type and parameter name.

Practical case:

The following is a function that calculates the factorial of a number:

int factorial(int num) {
  int result = 1;
  for (int i = 1; i <= num; i++) {
    result *= i;
  }
  return result;
}

// 测试函数
int main() {
  int number = 5;
  int result = factorial(number);
  cout << "阶乘结果：" << result << endl;
  return 0;
}

Output:

阶乘结果：120

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