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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