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TRANSCRIPT
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C
— —
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fopenfclosefprintf
printffscanf
exit
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(fopen )
fprintf fscanf
(fcolse )
FILE *
fopen(“ ”,” ”)
fprintf( , , )
fscanf( , , )
fclose( )
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FILE * ;
FILE * ’ ’
FILE stdio.h
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fopen fopen(" "," ")
FILE *file; /* file */
file = fopen(" "," ");
w
r
r NULL
fclose
fclose ;
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fprintf
fprintf( , );
”w”
int a=10;FILE *file=fopen("test","w"); /*test */fprintf(file, "%dYt",a); /* 10 */fprintf(file, "%d",a+1); /* 11 */fprintf(file, "%dYn",a*2); /* 20 */fclose(file);
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printf
C Y
Yn Yt Y" YY
" Y
printf
printf %
%d 10 %x 16
%5d5 %05d 5 55
%f 10 %.2f
%5.2f5
%+5.2f+
5%p %e 1.23e-4%c %s%% %
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11
kukuout.c
kuku
fprintf ”%2dY t” ”Y n”
1 2 3 4 5 6 7 8 92 4 6 8 10 12 14 16 183 6 9 12 15 18 21 24 274 8 12 16 20 24 28 32 365 10 15 20 25 30 35 40 456 12 18 24 30 36 42 48 547 14 21 28 35 42 49 56 638 16 24 32 40 48 56 64 729 18 27 36 45 54 63 72 81
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fscanf
scanf
fopen
fscanf( , );
”r”
int a; double b;FILE *file=fopen("test","r"); /*test */fscanf(file, "%d",&a); /* a */fscanf(file, "%lf",&b); /* b */fclose(file);
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C 3
stdin →fprintf(stdin,”· · · ”,· · · ) ⇔ scanf(”· · · ”,· · · )
stdout → (./a.out )fprintf(stdout,”· · · ”,· · · ) ⇔ printf(”· · · ”,· · · )
stderr → (./a.out )stdout stderr UNIX OS
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exit
main
#include
0main return 0; 0
exit(1);
exit
fprintf(stderr," " ;
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✓ ✏FILE *file = fopen("test","r");if(file==NULL){ /* */
fprintf(stderr, "cannot open file ’test’"); /* */exit(1); /* */
}✒ ✑✓ ✏double a; int scannum;FILE *file ;...scannum = fscanf(file,"%lf",&a); /* */if(scannum!=1){ /* */
fprintf(stderr, "cannot read file"); /* */exit(1); /* */
}✒ ✑fclose exit
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22
kukuin.c
kuku
- X
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kuku
exit
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fopenfclosefprintf
printffscanf
exit