a problem

i have a question: printf("%f",9/5); it prints 0.000000 as output, shouldn't it be 1.000000. Or does it depends on the compiler?

9/5 is an int
"%f" expects a double

int and double DO NOT MATCH!: you have Undefined Behaviour.

Try

Code:

printf("%d", 9/5);

or

Code:

printf("%f", 9/5.0);

And also remeber the float can only give a certain amount of pricision as it takes just about machine word to store. If require better precision use double.
As a fundemental cause of the failure, when you divide two integers you will get an integer. To prodouce a floating result on the operand need to be target result type. As in this case float.

ssharish