C Tutorial/Data Type/Union
Output both value in a union
#include <stdio.h>
union number {
int x;
double y;
};
int main()
{
union number value;
value.x = 100;
printf( "%s\n%s\n%s%d\n%s%f\n\n",
"Put a value in the integer member",
"and print both members.",
"int: ", value.x,
"double:\n", value.y );
value.y = 100.0;
printf( "%s\n%s\n%s%d\n%s%f\n",
"Put a value in the floating member",
"and print both members.",
"int: ", value.x,
"double:\n", value.y );
return 0;
}Put a value in the integer member and print both members. int: 100 double: 0.000000 Put a value in the floating member and print both members. int: 0 double: 100.000000
Union
- Union has members of different data types, but can hold data of only one member at a time.
- The different members share the same memory location.
- The total memory allocated to the union is equal to the maximum size of the member.
#include <stdio.h>
union marks
{
float percent;
char grade;
};
int main ( )
{
union marks student1;
student1.percent = 98.5;
printf( "Marks are %f address is %16lu\n", student1.percent, &student1.percent);
student1.grade = "A";
printf( "Grade is %c address is %16lu\n", student1.grade, &student1.grade);
}Marks are 98.500000 address is 2293620 Grade is A address is 2293620
