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What is the difference between char s[] and char *s in C?
Difference between char a[]=“string”; char *p=“string”;

Firstly, i would like to ask where can i learn all the basics of char* and char[].

Most of the time i find myself struggling with how to compare and how to declare.

Example 1 :

   char *test = "hello world";

This will produce the following warning at compilation :

 warning: deprecated conversion from string constant to ‘char*’

Example 2 :

   vector<char*> test2;
   test2.push_back("hello world");

This will produce an error of copying a string.

So the solution i come up with is :

(is this correct?)

   vector<char*> test3;
   char *str1 = "hello world"
   test3.push_back(str1);

Thanks in advance! 🙂

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Two good reads provided by people here :

What is the difference between char s[] and char *s?

Difference between char a[]="string"; char *p="string";

Answer 1

Your question “where can i learn all the basics of char* and char[],” is probably too general, but you can try reading the C++ spec.

Fix example 1 by changing it to

char const *test = "hello world";

Fix example 2 by changing it to

vector<std::string> test2;
test2.push_back("hello world");

Or if you really want a vector of non-owning pointers to c-strings:

vector<char const *> test2;
test2.push_back("hello world");