在控制台操作时，使用的格式化输入和输出为scanf和printf，那么对文件的IO操作也可以使用fscanf和fprintf，它们的使用如下：

#include <stdio.h>#include <string.h>#include <stdlib.h>const int LENGTH=80;int main(void){	long num1=234567L;	long num2=345123L;	long num3=789234L;		long num4=0L;	long num5=0L;	long num6=0L;		float fnum=0.0f;	int ival[6]={0};	FILE *pfile=NULL;	char * filename="C:\\temp\\test.txt";		pfile=fopen(filename,"w");	if(pfile==NULL)	{		printf("Fail to open\n");		exit(1);	}	fprintf(pfile,"%61d%61d%61d",num1,num2,num3);	fclose(pfile);	printf("\n %61d %61d %61d",num1,num2,num3);		pfile=fopen(filename,"r");	fscanf(pfile,"%2d%3d%3d%3d%2d%2d%3f",&ival[0],&ival[1],&ival[2],&ival[3],&ival[4],&ival[5],&fnum);	fclose(pfile);	remove(filename);		printf("\n");	for (int i=0;i<6;i++)		printf("%s ival[i]=%d",i==4?"\n\t":"\t",i,ival[i]);	printf("\nfnum=%f\n",fnum);	return 0;}