数学建模社区-数学中国

标题: 函数大全(v开头) [打印本页]

作者: 韩冰 时间: 2004-10-4 02:53
标题: 函数大全(v开头)
<

>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;
}

欢迎光临数学建模社区-数学中国 (http://www.madio.net/)