Difference between revisions of "C Coding Standard"
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[[Category:Coding Standards]] | [[Category:Coding Standards]] | ||
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==Language consideration== | ==Language consideration== | ||
* Avoid using assignment inside an expression. | * Avoid using assignment inside an expression. | ||
| Line 6: | Line 5: | ||
* Never use '''return''' if this is not the last instruction of a routine. | * Never use '''return''' if this is not the last instruction of a routine. | ||
* Use '''break''' only to separate branches of a switch statement. | * Use '''break''' only to separate branches of a switch statement. | ||
| + | *A declaration | ||
| + | *::<c>extern void foo();</c> | ||
| + | *:needs to be | ||
| + | *::<c>extern void foo(void);</c> | ||
| + | *:Otherwise it is not considered a prototype (for compatability with K&R) (see bug#13870). | ||
| + | * Use <c>"%f"</c> instead of <c>"%lf"</c> specifier in <c>printf</c> and family to print <c>double</c> (see bug#13872). This does not affect <c>scanf</c> and family. | ||
==Style== | ==Style== | ||
Latest revision as of 00:45, 2 August 2013
Language consideration
- Avoid using assignment inside an expression.
- Never use goto.
- Never use return if this is not the last instruction of a routine.
- Use break only to separate branches of a switch statement.
- A declaration
extern void foo();
- needs to be
extern void foo(void);
- Otherwise it is not considered a prototype (for compatability with K&R) (see bug#13870).
- Use
"%f"instead of"%lf"specifier inprintfand family to printdouble(see bug#13872). This does not affectscanfand family.
Style
- Always use curly braces, even when there is only one instruction. Instead of
if (a) do_something();
write
if (a) { do_something(); }
- Place opening brace at the same line as the condition as in
while (expr) { ... } for (;;) { ... }
unless the expression is very long as in
if (very_long_expression) { ... }
- Surround else with braces as in
if (expr) { ... } else { ... }
