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string strLine;//not constant int index = 0; while(index < strLine.length()){//strLine is not modified}; how many times strLine.length() is evaluated
do we need to put use nLength with nLength assigned to strLine.length() just before loop
lengthwill be evaluated every time you go via the loop, however sincelengthis constant time (O(1)) it doesn’t make much difference and adding a variable for storing this value will probably have a negligible effect with a small hit on code readability (as well as breaking the code if the string is ever changed).