歌曲信息管理系统的程序错误 哪位大神帮忙看一下

Question

看不懂哪里错了……希望有个大神指点一下 ps本人对C语言一窍不通

Answer 1

源代码如下

#include
#include
#include
#include
int i=0;
struct system
{
​char author[20];
​char singer[20];
​char time[20];
​char name[20];
​
} dan[100];

void enter()
{
​int j;
​char c[2];
​FILE *fp;
if((fp=fopen("data.txt","w"))==NULL)
​{
​printf("Can not open the file!\n");
​exit(0);
​}
​for(j=0;j<i;j++)
​{
​fwrite(&dan[j],sizeof(struct system),1,fp);
​}
​while(1)
​{
​printf("Please input the author:\n");
​scanf("%s",dan[i].author);
​printf("Please input the song's name:\n");
​scanf("%s",dan[i].name);
​printf("Please input the singer:\n");
​scanf("%s",dan[i].singer);
​printf("Please input the outday:\n");
​scanf("%s",dan[i].time);​
​if(fwrite(&dan[i++],sizeof(struct system),1,fp)!=1)
​printf("File write error\n");​
​else printf("Successful!\n");
​printf("Is there any more?( Yes[y]/No[n]) \n");
​scanf("%s",c);
​if(strcmp(c,"n")==0)break;​
​}​
​
​fclose(fp);
}

void delete()
{
​int j,v,c;
​char w[20];
​FILE *fp;
​printf("Please input the song'name which you want to delete:");
​scanf("%s",w);

​fp=fopen("data.txt","rb");

​for(j=0;j<100;j++)
​{
​if(fread(&dan[j],sizeof(struct system),1,fp)!=1) break;
​}
​v=j;
​for(j=0;j<v;j++)
​{
​if(strcmp(w,dan[j].name)==0)
​c=j;
​}
​fclose(fp);

​fp=fopen("data.txt","wb");
​for(j=0;j<v;j++)
​{
​if(j!=c)
​fwrite(&dan[j],sizeof(struct system),1,fp);
​}
​fclose(fp);
​printf("Delete OK!\n");
​i--;
}

void browse()
{
​int j;
​FILE *fp;
​fp=fopen("data.txt","rb");
​for(j=0;j<100;j++)
​{
​if(fread(&dan[j],sizeof(struct system),1,fp)==1)
​{
​printf("Name:%s\n",dan[j].name);
​printf("Author:%s\n",dan[j].author);
​printf("Singer:%s\n",dan[j].singer);
​printf("Outday:%s\n",dan[j].time);
​printf("---------------------------------\n");
​}
​else break;
​}
​fclose(fp);
}

void search()
{
​int flag,j,x;
​char w[20];
​FILE *fp;
​char v[20];
​printf("(1)By author\n");
​printf("(2)By singer\n");
​printf("(3)By name\n");
​printf("Please choose which you want to search:\n");
​scanf("%d",&x);
​if(x==3)
​{
​flag=0;
​printf("Please input the song's name:");
​scanf("%s",&w);
​fp=fopen("data.txt","rb");
​for(j=0;j<100;j++)
​{
​if(fread(&dan[j],sizeof(struct system),1,fp)!=1) break;
​if(strcmp(dan[j].name,w)==0)
​{
​printf("Name:%s\n",dan[j].name);
​printf("Author:%s\n",dan[j].author);
​printf("Singer:%s\n",dan[j].singer);
​printf("Outday:%s\n",dan[j].time);
​printf("---------------------------------\n");
​flag=1;
​
​}
​}
​if(flag==0)
​printf("Cannot find the song!\n");
​fclose(fp);
​}
​else if(x==2)
​{
​flag=0;
​printf("Please input the singer:");
​scanf("%s",&v);
​fp=fopen("data.txt","rb");
​for(j=0;j<100;j++)
​{
​if(fread(&dan[j],sizeof(struct system),1,fp)!=1) break;
​if(strcmp(dan[j].singer,v)==0)
​{
​printf("Name:%s\n",dan[j].name);
​printf("Author:%s\n",dan[j].author);
​printf("Singer:%s\n",dan[j].singer);
​printf("Outday:%s\n",dan[j].time);
​printf("---------------------------------\n");
​flag=1;
​
​}
​}
​if(flag==0)
​printf("Cannot find the song!\n");
​fclose(fp);
​}
​else if(x==1)
​{
​flag=0;
​printf("Please input the author:");
​scanf("%s",w);
​fp=fopen("data.txt","rb");
​for(j=0;j<100;j++)
​{
​if(fread(&dan[j],sizeof(struct system),1,fp)!=1) break;
​if(strcmp(dan[j].author,w)==0)
​{
​printf("Name:%s\n",dan[j].name);
​printf("Author:%s\n",dan[j].author);
​printf("Singer:%s\n",dan[j].singer);
​printf("Outday:%s\n",dan[j].time);
​printf("---------------------------------\n");
​flag=1;
​
​}
​}
​if(flag==0)
​printf("Cannot find the song!\n");
​fclose(fp);
​}
​else printf("Error!\n");
}
main()
{
​int a;

​while(1)
​{
printf("\t\tWelcome to the song'system!------by flea\n");
printf("\t\t******************^o^ MENU ^o^*******************\n\n");
printf("\t\t\t(1).Enter\n");
printf("\t\t\t(2).Delete\n");
printf("\t\t\t(3).Browse\n");
printf("\t\t\t(4).Search\n");
printf("\t\t\t(0).exit\n");
printf("\t\t*************************************************\n");
printf("\n\t\t\tPlease choose the number(0-4):");
​scanf("%d",&a);
​if(a==0) break;
​switch(a)
​{
​case 1:enter();break;
​case 2:delete();break;
​case 3:browse();break;
​case 4:search();break;
​}
​}
}