📄 union2.c
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/* Example of a typical use of a union */
#include <stdio.h>
#define CHARACTER 'C'
#define INTEGER 'I'
#define FLOAT 'F'
struct generic_tag{
char type;
union shared_tag {
char c;
int i;
float f;
} shared;
};
void print_function( struct generic_tag generic );
int main( void )
{
struct generic_tag var;
var.type = CHARACTER;
var.shared.c = '$';
print_function( var );
var.type = FLOAT;
var.shared.f = (float) 12345.67890;
print_function( var );
var.type = 'x';
var.shared.i = 111;
print_function( var );
return 0;
}
void print_function( struct generic_tag generic )
{
printf("\n\nThe generic value is...");
switch( generic.type )
{
case CHARACTER: printf("%c", generic.shared.c);
break;
case INTEGER: printf("%d", generic.shared.i);
break;
case FLOAT: printf("%f", generic.shared.f);
break;
default: printf("an unknown type: %c\n",
generic.type);
break;
}
}
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