C language - strings (single character), and character array

A . Definition string (single character) and the array of characters

1. Define a single character

char I = 'X' (defined single character)

After the string to create a constant can not be modified

2. Definition of an array of characters

char i [4]=”xxxx”;

char i []=”xxxx”;

char i [4]={‘x’’x’’x’’x’};

Where the number of the number of elements in the array of defined than the actual assignment of one more for storing \ 0 position

Only when defining the array of characters to the entire string at once assigned to it, once the definition is over, it is only a character by character the assignment.

Two strings (individual characters) and the input character array

1.scanf function

To string (a single character) assignment

scanf ( "% 2s", & x); (wherein x is defined name char type variable)

To the character array assignment

scanf ( "% 2s", x); (where x is defined in the character array name)

 2.fgets function

char food[5];

printf("Enter favorite food:");

fgets(food, sizeof(food), stdin);

fegets brackets mean content: Food ( the name of the array of characters) , the sizeof (Food) the maximum length of the received characters , stdin data from the keyboard

And scanf comparison, this function allows the user to enter a string with spaces

Three output string (single character) and the array of characters

1. The output of a single character

Printf ( "% C", X) ; for a single character output

X is char name type variable

2. The output of the array of characters

Printf ( " % S " , X ) ; the string output

X is a character array name

IV. Between character arrays and pointers are some considerations

the first:

char cards []; 
In this expression cards is an array of characters, and must be assigned immediately

#include <stdio.h> void stack_deck ( char Cards []) 
{ 
the printf ( " % S \ n- " , Cards); 
} int main ( void ) 
{ char Cook [] = " the Hello World! " ; 
stack_deck (Cook) ; return 0 ; 
} 
in this expression Cards [] is a function pointer variable of type char, he first byte address of the storage array cook.







 

second:

char s[] ="xxxx";
char * t = s;

When a character array variable is assigned to a pointer, the pointer variable will contain the address information of the array, and the array length information is lost