Standard Input/Output Library - University of Windsor

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IntroductionStreams and FILE objectsBufferingOpening a StreamReading and writing a streamSingle-character Input functionsint getc(FILE *), int fgetc(FILE *) andint getchar(void).We have:getchar(void) is equivalent to getc(stdin).getc() can be implemented as a macro whereasfgetc() cannot.→ getc is more efficient,→ the address of fgetc can be passed as a parameterunlike getc (macros do not have addresses).Important issues about these functionsThey return the next character as an unsigned charconverted into an int. Reason: the high order bit is set withoutcausing the return value to be negative.→ we can read all possible 255 different values of a byte. Inparticular, we will never get a character with -1(EOF) as itsvalue.→ The return value from these functions can’t be stored in achar variable then compared to EOFStandard Input/Output Library60-256 System Programming
Example...IntroductionStreams and FILE objectsBufferingOpening a StreamReading and writing a stream#include int main(int argc, char *argv[]){FILE *fd;char ch;int fileSize=-1;}fd = fopen(argv[1], "r");do{ch=getc(fd);fileSize++;} while( ch != EOF);printf("Size of %s is %d\n", argv[1], fileSize);./size size.c → Size of size.c is 242 (correct size)Standard Input/Output Library60-256 System Programming
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Page 3 and 4: IntroductionStreams and FILE object
Page 5 and 6: BufferingIntroductionStreams and FI
Page 8 and 9: Unbuffered I/OIntroductionStreams a
Page 12 and 13: Example 2IntroductionStreams and FI
Page 15 and 16: Opening a StreamIntroductionStreams
Page 17 and 18: Argument typesIntroductionStreams a
Page 19: Unformatted I/OIntroductionStreams
Page 28 and 29: ExampleIntroductionStreams and FILE
Page 30: IntroductionStreams and FILE object

Standard Input/Output Library - University of Windsor

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