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 topof the stackispoppedandprintedwhen the endof the in...
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 characterset.Forexample,in the ASCIIcharacterset the characterconstant '0' has the value 48 , ... etc., formacontiguousincreasingsequence. Another example of char to int conversion is the function lower , which maps a single character to lower cas...
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... files called main .c , getline .c ,and strindex .c .Then the command ccmain .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 ... executable file called a.out . If there is an error, say in main .c , the file can be recompiled by itself and the result loaded with the...
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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.Tocopy the characters,weneedaloop. The arrayversionfirst: /*strcpy:copyttos;arraysubscriptversion*/ 91 intgetline(char*,int); char*alloc(int); /*readlines:readinputlines*/ ...
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the ansi c programming phần 6 docx
... 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 .Itreturns the numberofcharactersprinted. The format string contains two types of objects: ordinary characters, which are copied to the outputstream,andconversio...
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the ansi c programming phần 7 pot
... input functionslike scanf , getc ,or getchar . 7.8 .4 CommandExecution 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 localoperatingsystem.Asatrivialexample,onUNIXsystems, the statement system("date"); causes ... file orerr...
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the ansi c programming phần 8 docx
... 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 constantisimplementation-defined. Character ... which specifies the character NUL. The escape \xhh consists of the backslash, followed by x , followed by hexadecimal digits, w...
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the ansi c programming phần 9 ppt
... the location in the abstract-declarator where the identifier would appear if the construction were a declarator in a declaration. The named type is then the sameas the typeof the hypotheticalidentifier.Forexample, int int* int*[3] int(*)[] int*() int(*[])(void) name ... compared with each case constant. If one of the case constants is equal to the v...
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the ansi c programming phần 10 ppsx
... the conditiondescribed,andzeroifnot. isalnum (c) isalpha (c) or isdigit (c) istrue isalpha (c) isupper (c) or islower (c) istrue iscntrl (c) controlcharacter isdigit (c) decimaldigit isgraph (c) printingcharacterexceptspace islower (c) lower-caseletter isprint (c) printingcharacterincludingspace ispunct (c) printingcharacterexceptspaceorletterordigi...
Ngày tải lên: 06/08/2014, 09:20