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if you always always call z(), after calling a() or b() or c(), then you could add the call to z() to each of a(), b() and c().<br />
<br />
then your resulting if statement would be :<br />
IF(a) {do a();}else if (b){do b();}else if(c){do c();}
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if you always always call z(), after calling a() or b() or c(), then you could add the call to z() to each of a(), b() and c().

then your resulting if statement would be :
IF(a) {do a();}else if (b){do b();}else if(c){do c();}

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That already looks like the most efficient evaluation to me.<br />
<br />
buttersk's is fine, saving that future readers of the code may find it opaque.<br />
<br />
Or maybe you could accommodate something on the lines of :<br />
<br />
do(z);<br />
if(a){do(a);}else if(b){do(b);}else if(c){do(c);}<br />
else{undo(z);}
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That already looks like the most efficient evaluation to me.

buttersk's is fine, saving that future readers of the code may find it opaque.

Or maybe you could accommodate something on the lines of :

do(z);
if(a){do(a);}else if(b){do(b);}else if(c){do(c);}
else{undo(z);}

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Is using a boolean flag in the conditions and checking the flag and calling z() is better than these ??
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Is using a boolean flag in the conditions and checking the flag and calling z() is better than these ??

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All <br />
<br />
I have to check multiple cases and update an error message but will have to perform the same piece of activity &nbsp;. For example <br />
IF(a) {do a();do z();}else if (b){do b();do z();}else if(c){do c();do z();}<br />
instead of calling z() thrice what is the best way to do it ?<br />
<br />
I can always hav a Boolean flag and validate it , is that the best way or is there a better way to accomplish this ?
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All 

I have to check multiple cases and update an error message but will have to perform the same piece of activity  . For example 
IF(a) {do a();do z();}else if (b){do b();do z();}else if(c){do c();do z();}
instead of calling z() thrice what is the best way to do it ?

I can always hav a Boolean flag and validate it , is that the best way or is there a better way to accomplish this ?

Nested if/else performing the same block of code - Efficient method

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