c++指针学习笔记--交换两个字符串数据

交换两个字符串数据。
一：字符指针

int main()

{

void charsort2(char ** ,char **);

char * s1="abc";

char * s2="baihe";

charsort2 (&s1,&s2);

cout<<s1<<endl;

cout<<s2<<endl;

return 0;

}

void charsort2(char **s1,char **s2)

{

char *p;

p=*s1;

*s1=*s2;

*s2=p;

}

二：字符数组

int main()

{

void charsort( char * ,char * );

char s1[7]="abc";

char s2[7]="baihe";

charsort(s1,s2);

cout<<s1<<endl;

cout<<s2<<endl;

return 0;

}

void charsort(char *s1,char *s2)

{

char p[7];

strcpy(p,s1);

strcpy(s1,s2);

strcpy(s2,p);

}

三：字符串

int main()

{

void strsort(string *,string *);

string s1="abc";

string s2="baihe";

strsort(&s1,&s2);

cout<<s1<<endl;

cout<<s2<<endl;

return 0;

}

void strsort(string *s1,string *s2)

{

string p;

p=*s1;

*s1=*s2;

*s2=p;

}

四：引用

int main()

{

void strsort(string &,string &);

string s1="abc";

string s2="baihe";

strsort(s1,s2);

cout<<s1<<endl;

cout<<s2<<endl;

return 0;

}

void strsort(string & s1,string &s2)

{

string p;

p=s1;

s1=s2;

s2=p;

}

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五:指针引用:

int main()

{

void charsort2(char*& ,char*&);

char * s1="abc";

char * s2="baihe";

charsort2 (s1,s2);

cout<<s1<<endl;

cout<<s2<<endl;

return 0;

}

void charsort2(char *&s1,char *&s2)

{

char *p;

p=s1;

s1=s2;

s2=p;

}