How do you define an array in the C language?

In C language, arrays are defined as follows:

1. Static definition: Use the following syntax to define arrays outside of a function or in the global scope.

data_type array_name[array_size];

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int numbers[5]; // 定义一个包含5个整数的数组
float grades[10]; // 定义一个包含10个浮点数的数组

1. Dynamic definition: use the following syntax to define arrays within a function:

data_type *array_name;
array_name = (data_type *)malloc(array_size * sizeof(data_type));

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int *numbers;
numbers = (int *)malloc(5 * sizeof(int)); // 定义一个包含5个整数的动态数组
float *grades;
grades = (float *)malloc(10 * sizeof(float)); // 定义一个包含10个浮点数的动态数组

Please remember to free the memory space by using free(array_name) after using the dynamically allocated array.

1. Assignment by equals sign: Assign initial values to array elements at the same time as defining the array.

data_type array_name[array_size] = {value1, value2, ..., valueN};

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int numbers[5] = {1, 2, 3, 4, 5}; // 定义一个包含5个整数的数组，并初始化为1、2、3、4、5
float grades[10] = {98.5, 87.0, 92.4, 100.0}; // 定义一个包含10个浮点数的数组，并初始化前4个元素

The above is the method of defining arrays in the C language.