How to Define C Functions

1 year ago
Ava Mitchell
1 minute

When defining a function in C language, it is necessary to include the following components:

  1. Return type: specifies the data type of the value returned by a function, such as int or void.
  2. Function name: Identifier of a function, used to call the function.
  3. Parameter list: the list of parameters that the function accepts, which can be empty or contain one or more parameters.
  4. Function body: The actual implementation code of a function.

A simple function is defined as follows:

返回类型 函数名(参数列表) {
    // 函数体
}

For example, here is a function definition that calculates the sum of two integers:

int add(int a, int b) {
    return a + b;
}

After defining a function, we can call it by using the function name and the parameter list, as shown below:

int result = add(10, 20);
printf("The sum is %d\n", result);

This allows for calling a function and using its return value.

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