#include<stdio.h>
#include<stdlib.h>
int main()
{
	FILE* fp=fopen("D:/a.txt","r");
	if(!fp) return -1;
	char* p=(char*)malloc(sizeof(char*)*1024);
	fscanf(fp,"%s",p);//读取文件中的内容，遇到换行和空格停止 
	printf("%s\n",p);
	
	int a,b,c;
	fscanf(fp,"%d+%d=%d",&a,&b,&c);
	printf("%d %d %d\n",a,b,c);
	
	free(p);
	fclose(fp);
	return 0;
}

#include<stdio.h>
#include<stdlib.h>
int main()
{
	FILE* fp=fopen("D:/b.txt","w");
	if(!fp) return -1;
	char ch[]="hello world";
	fprintf(fp,"%s",ch);//向文件中写入数据 
	int a=10;
	fprintf(fp,"%d",a);
	fclose(fp);
	return 0;
}