一、思维导图

二、练习

1.使用标准IO函数，实现文件的拷贝

#include <head.h>
int main(int argc, const char *argv[])
{
    FILE *p=fopen("./one.txt","r");
    FILE *fp=fopen("./two.txt","r+");
    if(p==NULL)
        PRINT_ERROR("fopen error");
    while(1)
    {   
        int res=fgetc(p);
        fputc(res,fp);
        if(res==EOF)
        {
            return -1;
        }
    }                                  
    return 0;
}

2.使用fgets函数，打印一个文件，类似cat

#include <head.h>
int main(int argc, const char *argv[])
{
    FILE *p=fopen("./one.txt","r");
    if(p==NULL)
        PRINT_ERROR("fopen error");          
    char buf[128]={0};
    while(fgets(buf,sizeof(buf),p)!=NULL){
    printf("%s",buf);   
    }
    return 0;
}   

3.计算文件的行数

#include <head.h>
int main(int argc, const char *argv[])
{
    FILE *p=fopen("./one.txt","r");
    if(p==NULL)                         
        PRINT_ERROR("fopen error");
    int count=0;
    int res;
    while((res=fgetc(p))!=EOF){
        if(res=='\n')
            count++;
    }
    printf("%d\n",count);
    return 0;
}