fig10_05.c

C程序设计经典教程第5版程序示例,比较适合初级c语言的学生

/* Fig. 10.5: fig10_05.c
   An example of a union */
#include <stdio.h>

/* number union definition */
union number {               
   int x;                    
   double y;                 
}; /* end union number */    

int main( void )
{ 
   union number value; /* define union variable */
   
   value.x = 100; /* put an integer into the union */
   printf( "%s\n%s\n%s\n  %d\n\n%s\n  %f\n\n\n",
      "Put a value in the integer member", 
      "and print both members.",
      "int:", value.x, 
      "double:", value.y );
   
   value.y = 100.0; /* put a double into the same union */
   printf( "%s\n%s\n%s\n  %d\n\n%s\n  %f\n",
      "Put a value in the floating member",
      "and print both members.",
      "int:", value.x, 
      "double:", value.y );

   return 0; /* indicates successful termination */

} /* end main */


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