text: #include"../../include/fast_io_c_interface/fast_io_c_stdio_interface.h"
  #include<time.h>
  #include<stddef.h>
  #include<stdlib.h>
  
  int main()
  {
  	clock_t t=clock();
  	FILE* fp=fopen("fp_test.txt","wb");
  	if(fp==NULL)
  	{
  		perror("fopen failed()");
  		abort();
  	}
  	for(size_t i=0;i!=10000000;++i)
  		PRINTLN_UNLOCKED(fp,i);
  	fclose(fp);
  	PRINTLN(stdout,((double)(clock()-t))/CLOCKS_PER_SEC);
  }