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Turbo C 2.0、Borland C++库函数及用例(31) /* get the comspec environment parameter */
flags=fnsplit(s,drive,dir,file,ext); printf("Command processor info:\n");
if(flags & DRIVE)
printf("\tdrive: %s\n",drive);
if(flags & DIRECTORY)
printf("\tdirectory: %s\n",dir); if(flags & FILENAME)
printf("\tfile: %s\n",file);
if(flags & EXTENSION)
printf("\textension: %s\n",ext); return 0;
}
函数名: fprintf
功 能: 传送格式化输出到一个流中
用 法: int fprintf( FILE *stream,
char *format[, argument,...] );
程序例:/* Program to create backup of the
AUTOEXEC.BAT file */#include <stdio.h>int main(void)
{
FILE *in, *out; if ((in = fopen("\\AUTOEXEC.BAT", "rt"))
== NULL)
{
fprintf(stderr, "Cannot open input \
file.\n");
return 1;
}
if ((out = fopen("\\AUTOEXEC.BAK", "wt"))
== NULL)
{ fprintf(stderr, "Cannot open output \
file.\n");
return 1;
} while (!feof(in))
fputc(fgetc(in), out);
fclose(in);
fclose(out);
return 0;
}
函数名: FP_OFF
功 能: 获取远地址偏移量
用 法: unsigned FP_OFF(void far *farptr);
程序例:/* FP_OFF */#include <dos.h>
#include <stdio.h>int main(void)
{
char *str = "fpoff.c";
printf("The offset of this file in memory\
is: %Fp\n", FP_OFF(str)); return 0;
}
函数名: FP_SEG
功 能: 获取远地址段值
用 法: unsigned FP_SEG(void far *farptr);
程序例:/* FP_SEG */#include <dos.h>
#include <stdio.h>int main(void)
{
char *filename = "fpseg.c";
printf("The offset of this file in memory\
is: %Fp\n", FP_SEG(filename)); return(0);
}
函数名: fputc
功 能: 送一个字符到一个流中
用 法: int fputc(int ch, FILE *stream);
程序例:
#include <stdio.h>int main(void)
{
char msg[] = "Hello world";
int i = 0; while (msg[i])
{
fputc(msg[i], stdout); i++;
}
return 0;
}
函数名: fputchar
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