第五次实验

#include <stdio.h>
#define N 5
#define M 80

typedef struct
{
    char name[M];
    char author[M];
}Book;

int main()
{
    Book x[N]={{"一九四八","乔治.奥威尔"},
              {"美丽新世界","赫胥黎"},
              {"昨日的世界","斯蒂芬.茨威格"},
              {"万历十五年","黄仁宇"},
              {"一只特立独行的猪","王小波"}
              };
              int i;
              FILE *fp;
              
              fp=fopen("datal.txt","w");
              if(fp==NULL)
              {
                  printf("fail to open file\n");
                  return 1;
              }
              
              for(i=1;i<N;++i)
              {
                  fprintf(fp,"%-20s %-20s\n",x[i].name,x[i].author);
                  printf("%-20s %-20s\n",x[i].name,x[i].author);
              }
              
              fclose(fp);
              
              return 0;
              }

#include <stdio.h>
#define N 5
#define M 80

typedef struct
{
    char name[M];
    char author[M];
}Book;


int main()
{
    Book x[N];
    int i;
    
    FILE *fp;
    fp=fopen("data1.txt","r");
    
    if(fp==NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    
    for(i=0;i<N;++i)
    {
        fscanf(fp,"%s %s\n",x[i].name,x[i].author);
        printf("%-20s %-20s\n",x[i].name,x[i].author);
    }
    
    fclose(fp);
    return 0;
}

答：scanf 函数的参数需要指针型，x.num,x.score[]这些都是普通变量，前面需要加指针符&转化成对应的指针.而x.name为字符数组，name就是该数组第一个数组的指针位置，所以不需要加&.

#include <stdio.h>
#define N 5
#define M 80
typedef struct
{
char name[M]; // 书名
char author[M]; // 作者
}Book;
int main()
{
Book x[N] = { {"一九八四", "乔治.奥威尔"},
            {"美丽新世界", "赫胥黎"},
            {"昨日的世界", "斯蒂芬.茨威格"},
            {"万历十五年", "黄仁宇"},
            {"一只特立独行的猪", "王小波"}
             };
int i;
FILE *fp;
// 以写的方式打开二进制文件data2.dat
fp = fopen("data2.dat", "wb");
// 如果打开文件失败，输出提示信息并返回
if(fp == NULL)
{
printf("fail to open file\n");
return 1;
}
// 将结构体数组x中的图书信息写以数据块方式写入文件
// 把从地址x处开始sizeof(Book)×N个字节大小的数据块写入fp指向的文件
fwrite(x, sizeof(Book), N, fp);
fclose(fp);
}

答：是；是

#include <stdio.h>

int main()
{
    FILE *fin,*fout;
    char ch;
    
    fin=fopen("data3_1.txt","r");
    
    if(fin==NULL)
    {
        printf("fail to open data3_1.txt\n");
        return 1;
    }
    
    fout=fopen("data3_2.txt","w");
    if(fout==NULL)
    {
        printf("fail to open data3_2.txt\n");
        return 1;
            }
            
            while(!feof(fin))
            {
                ch=fgetc(fin);
                
                if(ch>='a'&&ch<='z')
                ch-=32;
                
                fputc(ch,fout);
            }
            fclose(fin);
            fclose(fout);
            
            return 0;
}

#include <stdio.h>

int main()
{
    FILE *fin;
    char ch;
    int count=0;
    if((fin=fopen("data3_1.txt","r"))==NULL)
    {
        printf("fail to open data3_1.txt");
        return 1;
    }
    while(!feof(fin))
    {
        ch=fgetc(fin);
        if(ch!=' '&&ch!='\n'&&ch!='\t'&&ch!=EOF)
        {
            count++;
        }
        
    }
    printf("data3_1.txt中共包含字符数=%d",count);
    fclose(fin);
    return 0;
}