函数名: vfprintf
功 能: 送格式化输出到一流中
用 法: int vfprintf(FILE *stream, char *format, va_list param);
程序例:

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

FILE *fp;

int vfpf(char *fmt, ...)
{
va_list argptr;
int cnt;

va_start(argptr, fmt);
cnt = vfprintf(fp, fmt, argptr);
va_end(argptr);

return(cnt);
}

int main(void)
{
int inumber = 30;
float fnumber = 90.0;
char string[4] = "abc";

fp = tmpfile();
if (fp == NULL)
{
perror("tmpfile() call");
exit(1);
}

vfpf("%d %f %s", inumber, fnumber, string);
rewind(fp);
fscanf(fp,"%d %f %s", &inumber, &fnumber, string);
printf("%d %f %s\n", inumber, fnumber, string);
fclose(fp);

return 0;
}

函数名: vfscanf
功 能: 从流中执行格式化输入
用 法: int vfscanf(FILE *stream, char *format, va_list param);
程序例:

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

FILE *fp;

int vfsf(char *fmt, ...)
{
va_list argptr;
int cnt;

va_start(argptr, fmt);
cnt = vfscanf(fp, fmt, argptr);
va_end(argptr);

return(cnt);
}

int main(void)
{
int inumber = 30;
float fnumber = 90.0;
char string[4] = "abc";

fp = tmpfile();
if (fp == NULL)
{
perror("tmpfile() call");
exit(1);
}
fprintf(fp,"%d %f %s\n",inumber,fnumber,string);
rewind(fp);

vfsf("%d %f %s",&inumber,&fnumber,string);
printf("%d %f %s\n",inumber,fnumber,string);
fclose(fp);

return 0;
}

函数名: vprintf
功 能: 送格式化输出到stdout中
用 法: int vprintf(char *format, va_list param);
程序例:

#include <stdio.h>
#include <stdarg.h>

int vpf(char *fmt, ...)
{
va_list argptr;
int cnt;

va_start(argptr, format);
cnt = vprintf(fmt, argptr);
va_end(argptr);

return(cnt);
}

int main(void)
{
int inumber = 30;
float fnumber = 90.0;
char *string = "abc";

vpf("%d %f %s\n",inumber,fnumber,string);

return 0;
}

函数名: vscanf
功 能: 从stdin中执行格式化输入
用 法: int vscanf(char *format, va_list param);
程序例:

#include <stdio.h>
#include <conio.h>
#include <stdarg.h>

int vscnf(char *fmt, ...)
{
va_list argptr;
int cnt;

printf("Enter an integer, a float, and a string (e.g. i,f,s,)\n");
va_start(argptr, fmt);
cnt = vscanf(fmt, argptr);
va_end(argptr);

return(cnt);
}

int main(void)
{
int inumber;
float fnumber;
char string[80];

vscnf("%d, %f, %s", &inumber, &fnumber, string);
printf("%d %f %s\n", inumber, fnumber, string);

return 0;
}

函数名: vsprintf
功 能: 送格式化输出到串中
用 法: int vsprintf(char *string, char *format, va_list param);
程序例:

#include <stdio.h>
#include <conio.h>
#include <stdarg.h>

char buffer[80];

int vspf(char *fmt, ...)
{
va_list argptr;
int cnt;

va_start(argptr, fmt);
cnt = vsprintf(buffer, fmt, argptr);
va_end(argptr);

return(cnt);
}

int main(void)
{
int inumber = 30;
float fnumber = 90.0;
char string[4] = "abc";

vspf("%d %f %s", inumber, fnumber, string);
printf("%s\n", buffer);
return 0;
}

函数名: vsscanf
功 能: 从流中执行格式化输入
用 法: int vsscanf(char *s, char *format, va_list param);
程序例:

#include <stdio.h>
#include <conio.h>
#include <stdarg.h>

char buffer[80] = "30 90.0 abc";

int vssf(char *fmt, ...)
{
va_list argptr;
int cnt;

fflush(stdin);

va_start(argptr, fmt);
cnt = vsscanf(buffer, fmt, argptr);
va_end(argptr);

return(cnt);
}

int main(void)
{
int inumber;
float fnumber;
char string[80];

vssf("%d %f %s", &inumber, &fnumber, string);
printf("%d %f %s\n", inumber, fnumber, string);
return 0;
}

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