学习C++笔记212

append() 详解及其扩展(int, char):

#include

#include

#include

#include

#include

usingnamespace std;

int main()

{   cout<<"第三: 字符串的添加与复制 append();\nstring d(a);\ncout<;

   cout<<"1.在d的末尾添加字符串a\n\n";

   string d(a);

   d.append(b);

   cout<<d<<endl<<endl;

   cout<<"2.在d的末尾添加字符串/nb(0位置开始,2个长度)的数据\n\n";

   cout<<"d.append(b,0,2);\ncout<;

   d.append(b,0,2);

   cout<<d<<endl<<endl;

   cout<<"3.添加4个 ~ 字符\n\n";

   cout<<"d.append(4,'~');\n";

   cout<<"cout<;

   d.append(4,'~');

   cout<<d<<endl<<endl;

   system("pause");

   system("cls");

   cout<<"4. int 与 char 型添加 (好高兴自己想到的int ^_^ )\n";

   cout<<"char app[100]=\"aaabbb\";";

   cout<<"\nstring charr(\"-_-\");\n";

   cout<<"charr.append(app);\ncout<;

   char app[100]="aaabbb";

   string charr("-_- ");

   charr.append(app);

   cout<<charr<<endl<<endl;

   cout<<"charr.append(app,4);\ncout<;

   charr.append(app,4);

   cout<<charr<<endl<<endl;

   cout<<"char型数组全部,char型数组的前4个\n\n****如果要添加中间***\n";

   cout<<"string tmp;\nstring tmp;tmp.assign(app);\ncharr.assign(\"\");\ncharr.append(tmp,1,4);\ncout<;

   string tmp;

   tmp.assign(app);

   charr.assign("");

   charr.append(tmp,1,4);

   cout<<charr<<endl<<endl;

   cout<<"5.int  double 等等 通过 sprintf() 作为转接\n";

   cout<<"int aaa=15314;\ndouble bbb=3.1415;\nchar aa[10];\nsprintf(aa,\"%d\",aaa);\ncharr.append(aa,0,4);\nsprintf(aa,\"%f\",bbb);\ncharr.append(aa,0,4);\ncout<;

   int aaa=15314;

   double bbb=3.1415;

   char aa[10];

   sprintf(aa,"%d",aaa);

   charr.append(aa,0,4);

   sprintf(aa,"%f",bbb);

   charr.append(aa,0,4);

   cout<<charr<<endl<<endl;

   system("pause");

   system("cls");

   return0;

}