1.

思维导图

2.使用标准IO函数实现拷贝

 #include <stdio.h>                                           
 #include <string.h>
 #include <stdlib.h>
 #define PRINT_ERROR(msg) do{perror(msg);return -1;}while(0)
 int main(int argc, const char *argv[])
 {
     FILE* fp=fopen("test1.c","r");
     if(NULL==fp)
         printf("fopen error");
     FILE* gp=fopen("cptest.c","w");
     if(NULL==gp)
         printf("fopen error too");
     int res;
     while((res=fgetc(fp))!=EOF)
   {
      int ges=fgetc(gp);
      ges=res;
      printf("%c",ges);
   }
     if(fclose(fp)==EOF)
     PRINT_ERROR("flcose error");
     return 0;
 }

3.使用fgets打印文件

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#define PRINT_ERROR(msg) do{perror(msg); return -1;}while(0)
int main(int argc, const char *argv[])
{
   FILE* fp= fopen("3_3_1.c","r");
    if(NULL==fp)
    {
        printf("fopen error");
    }
    int res;
    while((res=fgetc(fp))!=EOF)
    {
        printf("%c",res);
    }
    if(fclose(fp)==EOF)
        PRINT_ERROR("flcose error");
    return 0;
}                                                             
                                                              

4.计算文件行数

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define PRINT_ERROR(msg) do{perror(msg);return-1;}while(0)
int main(int argc, const char *argv[])
{
    FILE* fp=fopen("3_3_1.c","r");
    if(NULL==fp)
        printf("fopen error");
    int res;
    int count=0;
    while((res=fgetc(fp))!=EOF)
    {
        if(res=='\n')
        {
            count++;
        }
        else if(res==EOF)
            break;
    }
    printf("有%d行",count);
    if(fclose(fp)==EOF)
        PRINT_ERROR("fclose error");
            return 0;
}