How to define functions by yourself in c++

By using the function keyword, you can create a custom function, including specifying the return type, naming the function, defining the parameter list, writing the function body, and returning a value (for non-void functions). The sample code demonstrates how to calculate the sum of two numbers and return the result. After you define a function, you can call it using the function name and argument list.

How to use C to define functions by yourself

In C, custom functions are passedfunction keyword to create. Function definitions generally have the following format:

<code class="cpp">return_type function_name(parameter_list) {
  // 函数体
}</code>

Steps:

1. Specify the return type: Determine what data type the function will return, For example, int, void, or string.
2. Name the function: Choose a descriptive name for the function.
3. Define parameter list: Specify the parameters accepted by the function and their types. If the function does not accept any parameters, the parentheses can be omitted.
4. Write the function body: Use curly braces {} to enclose the function body, which contains the specific code for function execution.
5. Return a value (optional): If a function is declared with a return type other than void, it is required to return a value in the function body.

Example:

<code class="cpp">// 计算两个数的和并返回结果
int add(int a, int b) {
  return a + b;
}</code>

Using a custom function:

After defining the function, you can use the function name and Parameter list to call it.

<code class="cpp">int result = add(5, 10); // 结果为 15</code>

Tip:

• Function names should be unique.
• The parameter type must match the type specified in the definition.
• The return type must match the type specified in the function definition.
• The code in the function body should be clear and concise.
• If the function does not return any value, the return statement can be omitted in the function body.

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