1. Why is it important for a developer to know the limitations of an optimizing compiler?  Why, in the following code, is the compiler unable to move the call to strlen out of the loop?           void upper(char *s) {                for (long i = 0; i < strlen(s); i++) {                     if (s[i] >= 'a' && s[i] <= 'z')                          s[i] += ('Z' - 'z');                }           }

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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1. Why is it important for a developer to know the limitations of an optimizing compiler? 

Why, in the following code, is the compiler unable to move the call to strlen out of the loop?

          void upper(char *s) {

               for (long i = 0; i < strlen(s); i++) {

                    if (s[i] >= 'a' && s[i] <= 'z')

                         s[i] += ('Z' - 'z');

               }

          }

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