The sizeof of the C-language plane question

<title>The sizeof of the C-language plane question</title> The sizeoftable of the question of C language face Contents

• 1. sizeof

1sizeof

sizeof is the length character of the data type or expression in C, it is not a function, and the calculation of the number of bytes in the program compiles
Not be counted during the execution of the program! (Literary not good, I will nonsense down, the next point)!

  #include
 
   
    
   int main (int argc, char* argv[]) {    char str[]= "123";    char *p=str;      printf ("%d\n", sizeof (' a '));  =4    printf ("%d\n", sizeof ("a"));  =2    printf ("%d\n", sizeof (str));  =4    printf ("%d\n", sizeof (p));    =4/8    printf ("%d\n", sizeof (*P));   =1        return 0;  }
 
   

• sizeof (' a ') = = 4 known as ' A ' corresponding ASCII code value is 97, that is ' a ' ==97, in other words
  sizeof (' a ') is equivalent to sizeof (97); In other words, the compiler handles it as an integer constant int
• sizeof ("a") = = 2 No need to explain, you know.
• sizeof (str) = = 4 asks for the size of the array footprint
• sizeof (p) = = 4 or 832-bit systems no matter what type of pointer, the size is 4 bytes
  64-bit systems no matter what type of pointer, the size is 8 bytes
• sizeof (*P) =1 equivalent to sizeof (STR1)

Footnotes:1

DEFINITION not FOUND.

Date:a date, fixed, of a format string for format-time-string

Author: Wild Book

Created:2016-07-24 Day 11:47

Emacs 24.5.1 (ORG mode 8.2.10)

The sizeof of the C-language plane question