1)
getchar must be a function in that case . Check /usr/include/stdio.h . It
must have contained an extern definition (it is on my machine).
2)
Machines generally have separate registers for floating point values(let say
%fr). While executing this line *printf("%d\n",t); *that register is loaded
with the value of* "t" *but this call to printf will not access it because
of* "%d" *specifier* . *Since then the value in this register has not been
replaced, therefore call to printf with* "%f" *specifier will access* %fr
*register
and print its value.*
*
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