C语言sizeof和三元运算符

#include <stdio.h>

main() {

   int a = 4;
   short b;
   double c;
   int* ptr;

   /* example of sizeof operator */
   printf(Line 1 - Size of variable a = %d\n, sizeof(a) );
   printf(Line 2 - Size of variable b = %d\n, sizeof(b) );
   printf(Line 3 - Size of variable c= %d\n, sizeof(c) );

   /* example of & and * operators */
   ptr = &a;    /* 'ptr' now contains the address of 'a'*/
   printf(value of a is  %d\n, a);
   printf(*ptr is %d.\n, *ptr);

   /* example of ternary operator */
   a = 10;
   b = (a == 1) ? 20: 30;
   printf( Value of b is %d\n, b );

   b = (a == 10) ? 20: 30;
   printf( Value of b is %d\n, b );
}