In the C language, both pointers and array names represent addresses, but there are big differences between the two. For beginners, you must figure out the difference between the two.
First, let me give a simple example:
char *p1="hello!"; //Define the character pointer p1, and point the pointer p1 to the first address of the string "hello!".
char s[10]="hello!"; //Define the array s and initialize it.
However, if char s[10]; s="hello!"; then an error will be reported, why? The reason is simple, because the array name is constant.
Closer to home, I will now give two simple examples:
Example 1
void main（）
{
char p[]="abcdef";
p[0]='Y';
printf("%s",p);
}
Output Ybcdef in this program
Example 2
void main（）
{
char *p="abcdef";
p[0]='Y';
printf("%s",p);
}
This program throws an exception, why?
In example 2, char *p="abcdef", the pointer p is stored in the stack area, but the string is constant and stored in the constant area, but the pointer p points to the first address of the string stored in the constant area. Change the value of the character string in the constant area.
In example 1, char p[]="abcdef", the assignment here is to copy the string "abcdef" in the constant area to the space of the array p in the stack area. Array p opens up space in the stack area. At this time, the value of the string can be modified because the value of the string in the stack area is modified. In addition, the array name p at this time is the first address of "abcdef" in the stack area.
In addition, if you want to better improve your programming ability, learn C language and C++ programming! Overtaking in a curve, one step faster! I may be able to help you here~
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