Linux C ++ Development Learning

1. segment Error

When a function is executed once, no error is reported. When a function is called iteratively in a loop, a segment error is returned.

Error cause.

Int Weight = 0;

Fprintf (ferr, "% s \ t % F \ t % s \ n", word, weight, hzpy );

If this statement is changed to fprintf (ferr, "% s \ t % d \ t % s \ n", word, weight, hzpy), no error is returned.

2. Double-layer Hash

If (defined ($ hashtobeupdate {$ VEC [1]})
126 {
127 If (defined ($ hashtobeupdate {$ VEC [1]} {$ VEC [0]}) & $ VEC [2]> 0)
128 {
129 $ hashtobeupdate {$ VEC [1]} {$ VEC [0]} + = $ VEC [2];
130 print stdout "$ VEC [1] \ t $ VEC [0] \ t $ hashtobeupdate {$ VEC [1] }{$ VEC [0]} \ n ";
131
132}
133}

Note:For a double-layer Hash, you must first check whether the first-layer key exists. Otherwise, the data is automatically inserted and the memory size increases.

2. Two string initialization Methods

CHar word [max_line_length] = {0 };

Char * word = new char [max_line_length];

Memset (word, 0, max_line_length );