• double類型轉換到char*

  1     char buffer[128];
  2     double value = 12.2345678;
  3     _gcvt(value, 5, buffer);//5有效數字
  4     printf("%s", buffer);

• unsigned int類型轉換到char*

   1     unsigned int num = 32;
   2     char str[32] = { 0 };
   3     //以2進制方式轉換
   4     _ultoa(num, str, 2);
   5     printf("%s\n", str);
   6
   
   
   7     //以8進制方式轉換
   8     _ultoa(num, str, 8);
   9     printf("%s\n", str);
  10 
  11     //以10進制方式轉換
  12     _ultoa(num, str, 10);
  13     printf("%s\n", str);
  14     //以16進制方式轉換
  15     _ultoa(num, str, 16);
  16     printf("%s\n", str);

• int類型轉換到char*

   1     int num = -32;
   2     char str[32] = { 0 };
   3     _ltoa(num, str, 2);
   
   4     printf("%s\n", str);
   5 
   6     _ltoa(num, str, 8);
   7     printf("%s\n", str);
   8     _ltoa(num, str, 10);
   9     printf("%s\n", str);
  10     _ltoa(num, str, 16);
  11     printf("%s\n", str);

• 獲取double類型的數據信息(1)

   1         double data = 12345.4567;
   2     
   3     int decimal;//整數的位數
   4     int
   
   sign;//1代表負，0代表證
   5     int precision = 9;//數字的寬度，強行指定
   6     char *buffer;//指針
   7 
   8     //把double類型轉化為char*
   9     buffer = _ecvt(data, precision, &decimal, &sign);//自動分配內存
  10     printf("buffer=%s\n", buffer);
  11     printf("sign=%d\n", sign);
  12     printf("decimal=%d\n", decimal);
  13     printf("precision =%d\n", precision);    

  

• 獲取double類型的數據信息(2)

   1     double data = 12345.4567;
   2 
   3     int decimal;//整數的位數
   4     int sign;//1代表負，0代表證
   5     int precision = 4;//小數點後的精度
   6     char *buffer;//指針
   7 
   8     buffer=_fcvt(data, precision, &decimal, &sign);
   9     printf("buffer=%s\n", buffer);
  10     printf("sign=%d\n", sign);
  11     printf("decimal=%d\n", decimal);
  12     printf("precision =%d\n", precision);
  13     

  

46.數字到字符串的轉換