the ansi c programming phần 4 pdf

... storage allocator. There are two routines. The first, alloc(n) , returns a pointer to n consecutive character positions, which can be used by the caller of alloc for storing characters. The second, afree(p) , ... replaced by their sum, 9. The product of -1 and 9, which is -9, replaces them on the stack. The value on the topof the stackispoppedandprintedwhen the endof the in...

Ngày tải lên: 06/08/2014, 09:20

... library. The first function is strcpy(s,t) , which copies the string t to the string s . It would be nice just to say s=t but this copies the pointer, not the characters.Tocopy the characters,weneedaloop. The arrayversionfirst: /*strcpy:copyttos;arraysubscriptversion*/ 91 intgetline(char*,int); char*alloc(int); /*readlines:readinputlines*/ ...

Ngày tải lên: 06/08/2014, 09:20

... the getch and ungetch that we wrote in Chapter 4. When the collection of an alphanumeric token stops, getword has gone one character too far. The call to ungetch pushes that character back on the ... the format .Itreturns the numberofcharactersprinted. The format string contains two types of objects: ordinary characters, which are copied to the outputstream,andconversio...

Ngày tải lên: 06/08/2014, 09:20

... input functionslike scanf , getc ,or getchar . 7.8 .4 CommandExecution The function system(char *s) executes the command contained in the character string s , then resumes execution of the current program. The contents of s depend strongly on the localoperatingsystem.Asatrivialexample,onUNIXsystems, the statement system("date"); causes ... file orerr...

Ngày tải lên: 06/08/2014, 09:20

... in 'x' . The value of a character constant with only one character is the numeric value of the character in the machine's character set at execution time. The value of a multi-character constantisimplementation-defined. Character ... which specifies the character NUL. The escape \xhh consists of the backslash, followed by x , followed by hexadecimal digits, w...

Ngày tải lên: 06/08/2014, 09:20