1-C traps and defects 1 in the computer classic book series

By Andrew Koenig, translated by Gao Wei, reviewed by Wang Xin

C traps and pitfalls

Andrew Koenig and C ++

Absolute classic

1. Greedy method in lexical analysis: each symbol should contain as many characters as possible

2. If the first character of an integer constant is 0, it is regarded as an octal value. 0100 = 64, not binary

3. printf ("Hello \ n"); with Char Hello [] = {'h', 'E', 'l', 'l', 'O ', '\ n', 0}; printf (Hello); equivalent

4. function pointer int (* FP) (); can be abbreviated as int FP ()

5. Simple priority: calculation> relationship> shift> Logic

6. It is best to write a semicolon next to struct a {...}. Some compilers will not report errors.

7. else always matches the nearest if in the same bracket

8. The C language only has a one-dimensional array, and the size of the array must be determined during compilation.

9. Multi-dimensional arrays are simulated by one-dimensional arrays.

10. int A [32] [11]; meaning that A is an array with 32 Elements and each element has 11 integer variables.

11. for int A [32] [11]; If int I = A [4] [5]; you can write it as I = * (a + 4) + 5 ); or I = * (a [4] + 5 );

12. int A [32] [11]; int (* AP) [11]; ap =;

13. As a function parameter, the array name is converted to a pointer pointing to the first element of the array.

14. extern char * P; different from extern char P [];

1-C traps and defects 1 in the computer classic book series