fprintf函数将格式打印到文件，非常好用（怎么没早点发现这个函数）

/* fprintf example */
#include <stdio.h>

int main ()
{
FILE * pFile;
int n;
char name [100];

pFile = fopen ("myfile.txt","w");
for (n=0 ; n<3 ; n++)
{
puts ("please, enter a name: ");
gets (name);
fprintf (pFile, "Name %d [%-10.10s]\n",n+1,name);
}
fclose (pFile);

return 0;
}