Could anyone tell me why data.i and data.f were corrupted? The website from which this code is from tries to explain it but uses bad grammar and many typos so I was wondering if anyone here might assist me.

#include 
#include 

union Data
{
   int i;
   float f;
   char  str[20];
};

int main( )
{
   union Data data;        

   data.i = 10;
   data.f = 220.5;
   strcpy( data.str, "C Programming");

   printf( "data.i : %d\n", data.i);
   printf( "data.f : %f\n", data.f);
   printf( "data.str : %s\n", data.str);

   return 0;
}

When the above code is compiled and executed, it produces following result:

data.i : 1917853763
data.f : 4122360580327794860452759994368.000000
data.str : C Programming