Union

Question

Why union in c with multiples members like
union u {
int a;
float b;
};

The second membre behaves in stranger manner?

Answer 1

The second member b, shows a lot of trailing zeroes after decimal dot when printed, because it's datatype is float.

Answer 2

For example. When I print int_num and fl_num in this code I get a strange number in console. Only variablrle str print corretly ("hello"). Why?

union val {
int int_num;
float fl_num;
char str[20];
};

union val test;

test.int_num = 123;
test.fl_num = 98.76;
strcpy(test.str, "hello");

printf("%d\n", test.int_num);
printf("%f\n", test.fl_num);
printf("%s\n", test.str);

Answer 3

Oh, yes. Now I understood. Thank you

Answer 4

union, test.

Answer 5

Val{
Int int_num;
Float f1_num;
};
Union val info;
Union Val ptr=
Info;