Will strlen be calculated multiple times if used in a loop condition?

Question

I\'m not sure if the following code can cause redundant calculations, or is it compiler-specific?

for (int i = 0; i < strlen(ss); ++i)
{
    // blabla
}
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Answer 1

Yes. strlen will be calculated everytime when i increases.

If you didn't change ss with in the loop means it won't affect logic otherwise it will affect.

It is safer to use following code.

int length = strlen(ss);

for ( int i = 0; i < length ; ++ i )
{
 // blabla
}