Application of C string array

1. special characters 'and' \ 0' in the character array

 

Char A [10] = {'I', '', 'A', 'M','', 'C', 'h', 'I ', 'N', 'A '};
Char B [] = "I am China ";
Printf ("% d \ n", strlen ());
Printf ("% d \ n", strlen (B ));
Printf ("% s \ n", );
Printf ("% s \ n", B );

Output result:

 

20

10

I am chinai am China

I am China

Why is the length of a 20? The reason is that the string ends with '\ 0', the length of array a is 10, and the length of the string is 10, therefore, the value of the next memory unit in the last element of array A is not '\ 0', but the first element in array B. It ends only when' \ 0' in array B is met.

Note: If the precedingCode

Char B [] = "I am China"; changed to Char B [10] = "I am China"; then B [11] is not necessarily '\ 0 '. therefore, the array size should be omitted when naming again.