c语言 fopen，fgets，fputc，putchar函数的简单使用
#include<stdio.h>#include<string.h>#include<stdlib.h>void copy_string(char from[],char to[])//简单的复制函数{int i=0;while(from[i]!='\0'){to[i]=from[i];i++;}to[i]='\0';}int main(){FILE * file;int i=0;char a[]="i am a teacher!";char b[]="you are a student";printf("string a=%s\nstring b=%s\n",&a,&b);//copy_string(a,b);printf("string a=%s\nstring b=%s\n",&a,&b);file=fopen("file.dat","wb+");if(file==NULL){printf("cant't open this file !\n");exit(0);}else{while(a[i]!=NULL){if(fputc(a[i],file)==NULL)putchar(file);i++;}i=0;while(b[i]!=NULL){if(fputc(b[i],file)==NULL)putchar(file);i++;}fclose(file);char str[100];FILE * readfile;readfile=fopen("file.dat","r+");fputs(fgets(str,100,readfile),stdout);fclose(readfile);}printf("\n");return 0;}