the ansi c programming phần 9 ppt

... compared with each case constant. If one of the case constants is equal to the value of the expression, control passes to the statement of the matched case label. If no case constant matches the expression, ... at the end of the declarator. The scope of an identifier declared at the head of a block begins at the end of its declarator, and persists to the end of the b...

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

... as 'x' . The value of a character constant is the numeric value of the character in the machine's characterset.Forexample,in the ASCIIcharacterset the characterconstant '0' has the value 48, ... which maps a single character to lower case for the ASCII character set. If the character is not an upper case letter, lower returnsitunchanged. /*...

Ngày tải lên: 06/08/2014, 09:20

... files called main .c , getline .c ,and strindex .c .Then the command ccmain .c getline .c strindex .c compiles the three files, placing the resulting object code in files main.o , getline.o , and strindex.o , then loads them all ... each character in s1 thatmatchesanycharacterin the string s2 . Exercise 2-5. Write the function any(s1,s2) , which returns the first...

Ngày tải lên: 06/08/2014, 09:20

... 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 inputlineisencountered. The ... 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 cha...

Ngày tải lên: 06/08/2014, 09:20

... 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conversionspecifications,eachofwhichcausesconversionandprintingof the ... the getch and ungetch that we wrote in Chapter4. When the collection of an alphanumeric token stops, getword has gone one chara...

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erro...

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

... the conditiondescribed,andzeroifnot. isalnum (c) isalpha (c) or isdigit (c) istrue isalpha (c) isupper (c) or islower (c) istrue iscntrl (c) controlcharacter isdigit (c) decimaldigit isgraph (c) printingcharacterexceptspace islower (c) lower-caseletter isprint (c) printingcharacterincludingspace ispunct (c) printingcharacterexceptspaceorletterordigi...

Ngày tải lên: 06/08/2014, 09:20