Quick question

**Stiks** · 10-09-2005

Im relatively new to C. On Tuesday we have a small test on simple things. On the sample test I have managed to answer many of the questions however I cant seem to solve a simple expression having to do with double and int. The question is:

1. What is the value of the following expression in C? Assume a=5, b=7, c=3.2, d=5.0.

a,b=int
c,d,e=double

e=b/a*c+c*d

From what my friend says, the answer is 19.2; however I do not know how he came to that conclusion. I know the book definitions of int and double, but I cant seem to apply it to this expression. I would appreciate it if someone could show me the process to solving it.

**sand_man** · 10-09-2005

Why don;t you put it into a compiler and find out the answer for yourself?

Code:

#include <stdio.h>

int main(void)
{
	int a=5, b=7;
	double c = 3.2, d = 5.0, e;
	e = b / a * c + c * d;
	printf("%lf",e);
	return 0;
}

**Salem** · 10-10-2005

Looks like an attempt to make you understand the difference between integer and floating point division.

**Stiks** · 10-10-2005

Well I could put it into pico (we use Unix) but its a written thing so putting it in a compiler wont help. I have to solve everything by hand.

**cwr** · 10-10-2005

Look up order of precedence and associativity in your C book, then work through it according to those rules.

**Dave_Sinkula** · 10-10-2005

Footnote about "operator precedance".

**cwr** · 10-10-2005

Originally Posted by Dave_Sinkula

Footnote about "operator precedance".

That's an interesting read, but it does also point out that you can rely on operator precedence rules in C as long as you don't think it has anything to do with order of evaluation. Since we are dealing with simple numeric constants and not anything with side effects, this is no problem.

Thread: Quick question

Thread Tools

Search Thread

Display

Quick question

Similar Threads

Very quick math question

very quick question.

quick question

Quick Question Regarding Pointers

Quick question: exit();