(C/C++) string / *char / int 基本轉換

網路上有許 string / *char / integer 基本轉換方式

string 與 *char 互相轉換的方法

     /* string to *char */
     string ssbuf1 = "string temp";
     char *cc_buf1 = (char*)ssbuf1.c_str();
     cout << cc_buf1 << endl;

     /* *char to string */
     char *cc_buf2 = "string data";
     string ssbuf2;
     strcpy((char*)ssbuf2.c_str(), cc_buf2);
     cout << ssbuf2.c_str() << endl;

int to *char / string

     /* int to string */
     int num1 = ;
     string ssbuf3;
     stringstream ssbuf1_stream;
     ssbuf1_stream << num1;
     ssbuf3 = ssbuf1_stream.str();
     cout << ssbuf3.c_str() << endl;

     /* int to *char */
     int num2 = ;
     char *cc_buf3 = (char*)malloc( * sizeof(char));
     _itoa(num2, cc_buf3, );
     cout << cc_buf3 << endl;

     /* int to string */
     int num4 = 0x55;
     string ssbuf4 = to_string(num4);
     cout << ssbuf4 << endl;

     /* int to hex string */
     int num5 = 0x66;
     string ssbuf5;
     _itoa(num5, (char*)ssbuf5.c_str(), );
     cout << ssbuf5.c_str() << endl;

*char to int

     /* *char to int */
     char *cc_buf4 = "";
     int num3;
     num3 = atoi(cc_buf4);
     cout << num3 << endl;

其中 atoi / _itoa 兩個函數由 stdlib.h 提供是滿常見的轉換方式，另外還有 atof 提供浮點數轉換