Common functions and corresponding header files (c + +)

1, qsort (array name, number, unit size, collation)-Cstdlib

2, memset (array name, set value, total size)-string

3. Format functions such as Cout<<fixed<<setprecision (n) <<-Iomanip

4, strcmp (), strcpy (), strlen ()-CString

The difference between a CString and a string:

CString is C + + compatible header file, inside the string is char[] type, function is strcmp (), strcpy (), strlen ();

String is the header file of C + +, the string is a type, there are many functions, corresponding to the above three kinds are = =, =, Str.len ().

Not to be continued ...

Common functions and corresponding header files (c + +)