the ansi c programming phần 5 pptx

... 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, ... etc., formacontiguousincreasingsequence. Another example of char to int conversion is the function lower , which maps a single character to lower case...

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

... 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

... 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 ... they match, the question is answered affirmatively. If the new record is less than the tree word, continue searching at the...

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

... a function. Acompleteexampleofanew-stylefunctiondefinitionis intmax(inta,intb,int c) { intm; m=(a>b)?a:b; return(m> c) ?m: c; } Here int is the declaration specifier; max(int a, int b, int c) is the function's declarator, and { } is the block giving the code for the function. The corresponding ... compared 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