C language-06 complex data type-02 string,-06-02

C language-06 complex data type-02 string,-06-02

#include <stdio.h>

int main ()
{
    // char name [] = {'i', 't', 'c', 'H', 's', 't', '\ 0'};
    char name [] = "itcast";
    
    name [3] = 'H';
    
    / *
    int size = sizeof (name);
    
    printf ("% d \ n", size);
    * /
    
    printf ("I'm taking a class at% s \ n", name);
    
    return 0;
}

// an initialization of the string
void test2 ()
{
    // \ 0's ASCII value is 0
    // all strings
    char name [8] = "it";
    char name2 [8] = {'i', 't', '\ 0'};
    char name3 [8] = {'i', 't', 0};
    char name4 [8] = {'i', 't'};
    
    // not a string (only a character array)
    char name5 [] = {'i', 't'};
}

/ *
void test ()
{
    // 'a' 'b' 'A'
    // "jack" == 'j' + 'a' + 'c' + 'k' + '\ 0'
    
    char name [10] = "jack888 \ n";
    
    // Passing the array is just a warning
    printf (name);
    
    printf (name);
    
    printf (name);
    
    printf ("57843578435");
} * /
#include <stdio.h>

/ *
 The role of \ 0
 1. End of string tag
 2.printf ("% s", name2);
 Will output characters from the address name2 until it encounters \ 0
 * /

int main ()
{
    char name [] = "itc \ 0ast";
    
    char name2 [] = {'o', 'k'};
    
    // printf ("% s \ n", name2);
    
    printf ("% s \ n", & name2 [1]);
    
    return 0;
}
/ *
strlen function: Calculate the length of a string
 1. Calculate the number of characters, not the number of words. A Chinese character counts as 3 characters
 2. Calculated characters do not include \ 0
 3. Count the number of characters from an address until it encounters \ 0
* /

// strlen function is declared in string.h file
#include <string.h>
#include <stdio.h>

int main ()
{
    // int size = strlen ("哈 haha");

    // printf ("% d \ n", size);
    / *
    char name [] = "itcast";
    char name2 [] = {'0', '\ 0', '6'};
    
    int size = strlen (name2);
    
    printf ("% d \ n", size);
    * /
    
    char name [] = "itcast";
    
    // printf ("% s \ n", name);
    
    printf ("% c \ n", name [3]);
    
    
    return 0;
}
 String array
#include <stdio.h>
int main ()
{
    char name [] = "jack";
    
    char name1 [] = "rose";
    
    char name2 [] = "jim";
    
    char name3 [] = "jake";
    
    char names [2] [10] = {"jack", "rose"};
    
    // printf ("% s \ n", names [0]);
    
    // printf ("% c \ n", names [0] [3]);
    
    char names2 [2] [10] =
    {
        {'j', 'a', 'c', 'k', '\ 0'},
        {'r', 'o', 's', 't', '\ 0'}
    };
    
    
    return 0;
}