c/c++语言函数: fprintf
功 能: 传送格式化输出到一个文件中
用 法: int fprintf(FILE *stream, char *format[, argument,...]);
返回值：成功时返回转换的字节数，失败时返回一个负数
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.
");
return 1;
}
if ((out = fopen("\AUTOEXEC.BAK", "wt"))
== NULL)
{
fprintf(stderr, "Cannot open output
file.
");
return 1;
}
while (!feof(in))
fputc(fgetc(in), out);
fclose(in);
fclose(out);
return 0;
}
举例用法：
#include <stdio.h>
#include <process.h>
FILE *stream;
void main( void )
{
int i = 10;
double fp = 1.5;
char s[] = "this is a string";
char c = '
';
stream = fopen( "fprintf.out", "w" );
fprintf( stream, "%s%c", s, c );
fprintf( stream, "%d
", i );
fprintf( stream, "%f
", fp );
fclose( stream );
system( "type fprintf.out" );
}
屏幕输出：
this is a string
10
1.500000