BOOL variable, float variable, pointer variable and integer variable compared to "0 value"

BOOL variable, float variable, pointer variable and integer variable compared to "0 value"

Example 1: writes the If statement of the BOOL flag versus the "0 value" comparison .

Answer:

if (flag)

if (!flag)

The following is a bad style :

I f (f l AG = = TRUE)

I f (f l AG = = 1)

I f (f l AG = = FALSE)

I f (f l AG = = 0)

Example 2: Please write out the IF statement of float x compared to "0 value".

Answer:

const float Epsinon = 0.00001;

if ((x >=-Epsinon) && (x <= epsinon))

You cannot use a floating-point variable with "= =" or "! = "Compare with the number 0 , you should try to convert to" >= "or" <= "this

Class form.

The following is the wrong wording :

I f (x = = 0.0)

I f (x! = 0.0)

Example 3: Please write out the IF statement of Char *p compared to "0 value".

Answer:

if (p = = NULL)

if (P! = NULL)

The following is a bad style :

I f (p = = 0)

I f (P! = 0)

I f (P)

I f (!p)

Example 4: Please write out the IF statement of the int x compared to the "0 value".

Answer:

I f (x = = 0)

I f (x! = 0)

You should use the integer variable with " = = " or "! = = "compares directly to 0 .

cannot imitate the style of a Boolean variable and write it :

I f (x) // can make people misunderstand val UE is a Boolean variable

I f (! X)

This article is from the "Rock Owl" blog, please be sure to keep this source http://yaoyaolx.blog.51cto.com/10732111/1765812

BOOL variable, float variable, pointer variable and integer variable compared to "0 value"