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--- tutorials:faq:main [2020/10/19 21:05]
miconda
+++ tutorials:faq:main [2021/04/03 13:18]
s.safarov_gmail.com
@@ Line 606: / Line 606: @@
 However, if return code is 0, the next action after function() is not executed. It can be used only of positive or negative response code.
+On the other hand, the pseudo-variables (including $rc) have to be compared as an integer, the rules for evaluating return code of the functions do not apply, for example:
+<code c>
+$var(x) = 0;
+if($var(x) == 0) {
+  # do something
+}
+</code>
+To compare the return code of a function with a number is recommended to use the value stored in $rc, because the priority of the operators can convert function return code to internal-true or internal-false. Therefore the next approach should be used:
+<code c>
+function_returns_four();
+$var(rc4) = $rc;
+if($var(rc4)==4) {
+   # it goes here
+} else {
+   # it doesn't go here
+}
+...
+function_returns_two();
+$var(rc2) = $rc;
+if($var(rc4)==$var(rc2)) {
+   # it doesn't go here
+} else {
+   # it goes here
+}
+...
+if (function_returns_four() && $rc ieq 6 ) {
+   # it doesn't go here
+} else if ($rc ieq 4) {
+   # it goes here
+} else {
+   # it doesn't go here
+}
+</code>
+Note that $rc is overwritten by a new function call, therefore store its value in another variable (like $var(...)) if it is needed for longer time.
+For pseudo-variables, the non-zero value is evaluated to true and zero to false, for example:
+<code c>
+$var(x) = 1;
+if($var(x)) {
+  # do something
+}
+</code>
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