将一种数据类型转换为另一种类型

#include <stdio.h>

int main(voID) /* print i and i/2 with fractions */
{
   int i;

   for (i = 1; i <= 50; ++i)
      printf("%d / 2 is: %f\n", i, (float)i / 2);
   return 0;

}