文件格式化输入和输出

标签：c   fscanf   fprintf   fclose   remove   

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;
}

文件格式化输入和输出,布布扣,bubuko.com

文件格式化输入和输出

标签：c   fscanf   fprintf   fclose   remove   

原文地址：http://blog.csdn.net/u010142437/article/details/28435519