CODEWITHSUNDEEP
cfloating-pointintroundingc99
Dimitar
Dimitar

Reputation: 4783

Conversion to ‘int’ from ‘float’ may alter its value

My code:

#inlcude <math.h>
#include "draw.h"  /*int draw(int x, int y)*/

draw(rintf(10 * x), rintf(8 * y));

I get this warning: Conversion to ‘int’ from ‘float’ may alter its value.

I can't change draw to float, since I need it to draw points. So rounding is inevitable. Any ideas?

Upvotes: 2

Views: 3692

Answers (1)

Arkku
Arkku

Reputation: 42139

The return type of rintf is float which produces the warning. You can either explicitly cast to int to suppress the warning (i.e., (int) rintf(10 * x), or you could use another way of rounding (e.g., if the values are known to be non-negative, (int) (10.0f * x + 0.5f)) or lrint (preferably from tgmath.h), although it returns a long which may cause another warning depending on your compiler and settings.

Upvotes: 1

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