重学C++ 大小写转换

//源代码来自 《C++ 程序员教程》

#include<iostream>using std::cout;using std::endl;#include<cctype>using std::islower;using std::toupper;void convertTouppercase(char*);int main(){char phrase[]="characters and $32.98";cout<<"The phrase before conversion is:"<<phrase<<endl;convertTouppercase(phrase);cout<<"The phrase after conversion is:"<<phrase<<endl;return 0;}void convertTouppercase(char* phrase){while(*phrase!='\0'){if(islower(*phrase)){*phrase=toupper(*phrase);}phrase++;}}