Wu Yuxiong - natural born C language: data types

#include <stdio.h>
#include <limits.h>
 
int main()
{
   printf("int 存储大小 : %lu \n", sizeof(int));
   
   return 0;
}

#include <stdio.h> 
#include < a float .h> int main () 
{ 
   the printf ( " a float store a maximum number of bytes:% D \ n- " , the sizeof ( a float )); 
   the printf ( " a float minimum:% E \ n- " , FLT_MIN); 
   the printf ( " a float maximum:% E \ n- " , FLT_MAX); 
   the printf ( " precision value:% D \ n- " , FLT_DIG); return 0 ; 
}
 

   
    

int    i, j, k;
char   c, ch;
float  f, salary;
double d;

int    i, j, k;
char   c, ch;
float  f, salary;
double d;

extern  int i; // declaration, not a definition 
int i; // declaration, also the definition of

#include <stdio.h> // function defined outside variables x and y int x;
 int y;
 int addtwonum () 
{ // the function declaration variables x and y for the external variable extern int x;
     extern int y;
     // to external variable (global variable) x and y assignment 
    X = . 1 ; 
    y = 2 ;
     return X + y; 
} int main () 
{ int Result;
     // function addtwonum call 
    Result = addtwonum (); 
    the printf ( " Result is:% d "
 


    
      
 

    
    ,result);
    return 0;
}

#include <stdio.h>
 / * the external variable declarations * / 
extern  int X;
 extern  int Y;
 int addtwonum () 
{ 
    return X + Y; 
}

#include <stdio.h> / * define two global variables * / int X = . 1 ;
 int Y = 2 ;
 int addtwonum ();
 int main ( void ) 
{ int Result; 
    Result = addtwonum (); 
    the printf ( " Result It was:% D \ n- " , Result);
     return 0 ; 
}
  


     

#include <stdio.h>
 
#define LENGTH 10   
#define WIDTH  5
#define NEWLINE '\n'
 
int main()
{
 
   int area;  
  
   area = LENGTH * WIDTH;
   printf("value of area : %d", area);
   printf("%c", NEWLINE);
 
   return 0;
}

const type variable = value;

#include <stdio.h>
 
int main()
{
   const int  LENGTH = 10;
   const int  WIDTH  = 5;
   const char NEWLINE = '\n';
   int area;  
   
   area = LENGTH * WIDTH;
   printf("value of area : %d", area);
   printf("%c", NEWLINE);
 
   return 0;
}