Definition and assignment of arrays in C language

One-dimensional array is defined as follows:

类型说明符 数组名[常量表达式];

For example:

int a[5];

It means that an integer array is defined , the array is called a, and the defined array is called array a.

At this time, there are 5 elements in array a, each element is an int type variable, and their addresses in the memory are allocated continuously. In other words, if an int type variable occupies 4 bytes of memory space, then 5 int type variables occupy 20 bytes of memory space, and their addresses are allocated continuously.

One-dimensional array initialization

The initialization of one-dimensional array can be achieved using the following methods:

1. Assign initial values ​​to all elements when defining the array , this is called "full initialization".

For example:

int a[5] = {1, 2, 3, 4, 5};

By placing the initial values ​​of the array elements in a pair of curly braces, after initialization, a[0]=1; a[1]=2; a [2]=3; a[3]=4; a[4]=5, that is, assigned to each element from left to right. It should be noted that during initialization, each element is separated by commas, not semicolons.

2. You can assign values ​​to only part of the elements, which is called "incomplete initialization".

For example:

int a[5] = {1, 2};

The array a defined has 5 elements, but only two initial values ​​are provided within the curly braces, which means that only the first two elements a[0] are given , a[1] is initialized, and the following three elements are not initialized. When incompletely initialized, elements that have not been initialized are automatically set to 0.

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