大小写转换函数，位运算的使用

#include<iostream>#include<algorithm>#include<string>#include<string.h>using namespace std;void ToUpper(char *str){ char *beg=str; char ch; for(int i=0,length=strlen(str);i<length;i++,beg++) { ch=*beg; if(ch>='a'&&ch<='z') *beg=ch&0xDF; }}void ToLower(char *str){ char *beg=str; char ch; for(int i=0,length=strlen(str);i<length;i++,beg++) { ch=*beg; if(ch>='A'&&ch<='Z') *beg=ch|0x20; }}int main(){ char hello1[]="I Hate This Fucking World!NOthing i WOuld care about&*^%"; char hello2[]="I Hate This Fucking World!NOthing i WOuld care about&*^%"; ToUpper(hello1); ToLower(hello2); cout<<"the string after use ToUpper------"<<hello1<<endl; cout<<"the string after use ToLower------"<<hello2<<endl;return 0;}