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switches with doubles?

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Started by Surg AKA Kunark November 10, 2004 04:04 PM

3 comments, last by iMalc 19 years, 5 months ago

Surg AKA Kunark

128

Author

November 10, 2004 04:04 PM

Okay i just got newbed by c++ .... is there a way to use doubles with a switch? I had this...


	for(int i=23; i>=0; i--) {

		cout.setf(ios::fixed);
		cout.precision(1);

		if (( dGrade >= 0 ) && ( dGrade <= 100 )){
			cout << dGrade << "\n";

			switch(dGrade) {
				case (dGrade > 50):
					cGrade = F;
					break;
				case ((dGrade <= 50) && (dGrade < 60)):
					cGrade = D;
					break;
				case ((dGrade <= 60) && (dGrade < 70)):
					cGrade = C;
					break;
				case ((dGrade <= 70) && (dGrade < 80)):
					cGrade = B;
					break;
				case ((dGrade <= 90) && (dGrade < 100)):
					cGrade = A;
					break;
			}
		}
	}

or... how would be the easiest way to do this ??

~~Johnathan~~LTM my new fad, know it, use it, love it, LAUGHING TO MYSELF

Agony

3,452

November 10, 2004 04:13 PM

I assume double constants would work, but C/C++ switches in no way allow ranges. You'll have to use if/else statements:

if (dGrade > 50)	cGrade = F;else if ((dGrade <= 50) && (dGrade < 60))	cGrade = D;else if ((dGrade <= 60) && (dGrade < 70))	cGrade = C;else if ((dGrade <= 70) && (dGrade < 80))	cGrade = B;else if ((dGrade <= 90) && (dGrade < 100))	cGrade = A;

"We should have a great fewer disputes in the world if words were taken for what they are, the signs of our ideas only, and not for things themselves." - John Locke

snk_kid

1,312

November 10, 2004 04:21 PM

Quote:Original post by Agony
I assume double constants would work

switch statements accept integral types only or user defined type for which there is an unambiguous conversion to integral type.

Agony

3,452

November 10, 2004 05:08 PM

Quote:Original post by snk_kid
Quote:Original post by Agony
I assume double constants would work

switch statements accept integral types only or user defined type for which there is an unambiguous conversion to integral type.

Gotcha. Even I was being too liberal with my assumptions. Thanks for the correction.

[I suppose I could've easily looked it up in the docs, but, meh, I'm in a weird mental funk today, and I wanted to beat everyone else to an answer so I could stay in the top 20 ranked non-mods/staff. [smile] I'm silly, I know.]

"We should have a great fewer disputes in the world if words were taken for what they are, the signs of our ideas only, and not for things themselves." - John Locke

iMalc

2,466

November 11, 2004 02:59 AM

You really need to learn to get < and > the right way around...
> 50 gives you F ???
<=50 AND < 60 gives you D ???

Using dGrade divided by ten will vastly simplify the rest of your code...

			switch(dGrade / 10) {				case 6:					cGrade = 'D';					break;				case 7:					cGrade = 'C';					break;				case 8:					cGrade = 'B';					break;				case 9:					cGrade = 'A';					break;				default:					cGrade = 'F';			}

"In order to understand recursion, you must first understand recursion."
My website dedicated to sorting algorithms

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