C ++ char *, char [], String, cstring Conversion

C ++ char *, char [], String, cstring Conversion

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Char * --------> char []
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Char * ADDR;
Char [20] address;
Strcpy (address, ADDR );
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String ----------> cstring
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String;
Cstring str1;
Str1 = A. c_str ();
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Cstring ----------> char []

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Cstring str1;
Char szchar [20];
Strcpy (szchar, (char *) (const char *) str1 );
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String -----------> Number
Strcpy (temp, "123 ");

If it is: Short INTEGER (INT)
I = atoi (temp );

If it is a long integer (long)
L = atol (temp );

If it is: Floating Point (double)
D = atof (temp );

If it is a cstring variable
Cstring name = temp;
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Number -----------> string

1) Short INTEGER (INT)
ITOA (I, temp, 10); // convert I to a string and put it into temp. the last digit indicates decimal.
ITOA (I, temp, 2); // convert in binary mode

2) long integer (long)
Ltoa (L, temp, 10 );

3) floating point number (float, double)
Fcvt can be used to complete the conversion. This is an example in msdn:
Int decimal, sign;
Char * buffer;
Double Source = 3.1415926535;
Buffer = _ fcvt (source, 7, & decimal, & sign );
Running result: Source: 3.1415926535 Buffer: '20180101' decimal: 1 sign: 0
Decimal indicates the decimal point position, sign indicates the symbol: 0 is a positive number, and 1 is a negative number.
Cstring variable
STR = "2008 Beijing Olympics ";
Buf = (lpstr) (lpctstr) STR;