做了个程序，请大家帮忙改改错

printf("请选择你需要的服务：");
scanf("%d",&a);
FILE * fp;
fp=fopen("tongxunlu.txt","a+");
   if(fp==NULL)
   {printf("opening file error!");
   exit(0);}
while(!feof(fp))
{
   fscanf(fp,"%s",c[i]);
   fscanf(fp,"%s",d[i]);
   fscanf(fp,"%s",e[i]);
   fscanf(fp,"%s",f[i]);
   fscanf(fp,"%s",g[i]);
   fscanf(fp,"%s",h[i]);
   i++;
   z++;
}
fclose(fp);
if(a==1)
{system("cls");
add();}                                //调用添加联系人函数
else if(a==2)
{system("cls");
del();}
else if(a==3)
{system("cls");
modify();}
else if(a==4)
{system("cls");
search();}
else if(a==5)
{system("cls");
put();}                                
else
{printf("\t输入失误\n\n");}
fflush(stdin);
printf("\n是否继续其他操作(Y/N)");
scanf("%c",&b);
if(b=='y'||b=='Y')
goto LOOP;
}
/***************************添加联系人功能*****************************************************/
void add()
{
char a,b[7][30];
a='y';
while(a=='y'||a=='Y')
{
system("cls");
printf("\n");
printf("\t              欢\n");
printf("\t                 迎*\n");
printf("\t                    使\n");
printf("\t                       用\n");
printf("\t                          通\n");
printf("\t                             讯\n");
printf("\t                                录\n");
printf("\t                                   管\n");
printf("\t                                      理\n");


printf("\t                                         系\n");
printf("\t                                            统\n");
printf("                                                         计1002班   吴楠\n");
FILE * fp;
fp=fopen("tongxunlu.txt","a");
   if(fp==NULL)
   {printf("opening file error!");
   exit(0);}
    printf("1、姓名：");
    b[0][0]=getchar();
    fputc(b[0][0],fp);
    gets(b[1]);
    fputs(b[1],fp);
    int i=0;
    while(b[1][i]!='\0')
    {i++;}
    for(int n=0;n<=7-i;n++)
    {fputs(" ",fp);}
    printf("2、联系电话： ");
    gets(b[2]);
    fputs(b[2],fp);
    i=0;
    while(b[2][i]!='\0')
    {i++;}
    for( n=0;n<=10-i;n++)
    {fputs(" ",fp);}
    printf("3、电子邮箱： ");
     gets(b[3]);
    fputs(b[3],fp);
     i=0;
    while(b[3][i]!='\0')
    {i++;}
    for( n=0;n<=10-i;n++)
    {fputs(" ",fp);}
    printf("4、工作单位： ");
     gets(b[4]);
    fputs(b[4],fp);
     i=0;
    while(b[4][i]!='\0')
    {i++;}
    for( n=0;n<=10-i;n++)
    {fputs(" ",fp);}
    printf("5、家庭住址： ");
     gets(b[5]);
    fputs(b[5],fp);
     i=0;
    while(b[5][i]!='\0')
    {i++;}
    for( n=0;n<=10-i;n++)
    {fputs(" ",fp);}
    printf("6、群组分类(亲属、同事、同学、朋友、其他)： ");
    gets(b[6]);
    fputs(b[6],fp);
    z++;
    printf("已成功添加,继续添加联系人请按y\n,按任意键退出");
    a=getchar();
    fclose(fp);
}
}
/***********************************删除联系人功能**********************************************/


void del()
{ system("cls");
printf("\n");
printf("\t              欢\n");
printf("\t                 迎*\n");
printf("\t                    使\n");
printf("\t                       用\n");
printf("\t                          通\n");
printf("\t                             讯\n");
printf("\t                                录\n");
printf("\t                                   管\n");
printf("\t                                      理\n");
printf("\t                                         系\n");
printf("\t                                            统\n");
printf("                                                         计1002班   吴楠\n");
char j[5];
   int i=0,o=0,l=0,m=0,n=0;
    printf("请输入要删除的联系人的名字：\n");
    fflush(stdin);
     gets(j);
    for(i=0;i<=z;i++)
    {
     if(strcmp(c[i],j)==0)
     {
      printf("以下联系人已被删除\n");
      printf("%s",c[i]);
      printf(" ");
      printf("%s",d[i]);


      printf(" ");
      printf("%s",e[i]);
      printf(" ");
      printf("%s",f[i]);
      printf(" ");
      printf("%s",g[i]);
      printf(" ");
      printf("%s",h[i]);
      printf("\n");
      o=1;
      FILE * fp;
      fp=fopen("tongxunlu.txt","w");
      if(fp==NULL)
      {printf("opening file error!");
      exit(0);}
      for(l=0;l<i;l++)
      {
       fputs(c[l],fp);
       m=0;
       while(c[l][m]!='\0')
       {m++;}
       for(n=0;n<=7-m;n++)
       {fputs(" ",fp);}
       fputs(d[l],fp);
       m=0;
       while(d[l][m]!='\0')
       {m++;}
       for(n=0;n<=10-m;n++)
       {fputs(" ",fp);}
       fputs(e[l],fp);
       m=0;
       while(e[l][m]!='\0')
       {m++;}
       for(n=0;n<=10-m;n++)
       {fputs(" ",fp);}
       fputs(f[l],fp);
       m=0;
       while(f[l][m]!='\0')
       {m++;}
       for(n=0;n<=10-m;n++)
       {fputs(" ",fp);}
       fputs(g[l],fp);
       m=0;
       while(g[l][m]!='\0')
       {m++;}
       for(n=0;n<=10-m;n++)
       {fputs(" ",fp);}
       fputs(h[l],fp);
       fputs("\n",fp);
      }
      if(i<=z)
      {
       for(l=i+1;l<z;l++)
       {
        fputs(c[l],fp);
        m=0;
        while(c[l][m]!='\0')
        {m++;}
        for(n=0;n<=7-m;n++)


        {fputs(" ",fp);}
        fputs(d[l],fp);
        m=0;
        while(d[l][m]!='\0')
        {m++;}
        for(n=0;n<=10-m;n++)
        {fputs(" ",fp);}
        fputs(e[l],fp);
        m=0;
        while(e[l][m]!='\0')
        {m++;}
        for(n=0;n<=10-m;n++)
        {fputs(" ",fp);}
        fputs(f[l],fp);
        m=0;
        while(f[l][m]!='\0')
        {m++;}
        for(n=0;n<=10-m;n++)
        {fputs(" ",fp);}
        fputs(g[l],fp);
        m=0;
        while(g[l][m]!='\0')
        {m++;}
        for(n=0;n<=10-m;n++)
        {fputs(" ",fp);}
        fputs(h[l],fp);
        fputs("\n",fp);
       }
      }
      fclose(fp);
     }
    }
    if(o==0)
    printf("未找到符合条件的联系人\n");
    exit(0);
}
/*****************************************************修改联系人功能*******************************************************/
void modify()
{ system("cls");
printf("\n");
printf("\t              欢\n");
printf("\t                 迎*\n");
printf("\t                    使\n");
printf("\t                       用\n");
printf("\t                          通\n");
printf("\t                             讯\n");
printf("\t                                录\n");


printf("\t                                   管\n");
printf("\t                                      理\n");
printf("\t                                         系\n");
printf("\t                                            统\n");
printf("                                                         计1002班   吴楠\n");
char j[5];
   int i=0,o=0,l=0,m=0,n=0;
    printf("请输入要修改的联系人的名字：\n");
    fflush(stdin);
     gets(j);
    for(i=0;i<=z;i++)
    {
     if(strcmp(c[i],j)==0)
     {
      printf("将修改以下联系人\n");
      printf("%s",c[i]);
      printf(" ");
      printf("%s",d[i]);
      printf(" ");
      printf("%s",e[i]);
      printf(" ");
      printf("%s",f[i]);
      printf(" ");
      printf("%s",g[i]);
      printf(" ");
      printf("%s",h[i]);
      printf("\n");
      o=1;
      printf("修改姓名请按1，修改电话请按2，修改邮箱请按3，修改单位请按4，修改住址请按5，修改分类请按6，");
      scanf("%d",&m);
      if(m==1)
      {printf("请输入新信息");fflush(stdin);gets(c[i]);}
      if(m==2)
      {printf("请输入新信息"); fflush(stdin);gets(d[i]);}
      if(m==3)
      {printf("请输入新信息"); fflush(stdin);gets(e[i]);}
      if(m==4)


      {printf("请输入新信息"); fflush(stdin);gets(f[i]);}
      if(m==5)
      {printf("请输入新信息");fflush(stdin);gets(g[i]);}
      if(m==6)
      {printf("请输入新信息"); fflush(stdin);gets(h[i]);}
      printf("信息修改成功！");
      FILE * fp;
      fp=fopen("tongxunlu.txt","w");
      if(fp==NULL)
      {printf("opening file error!");
      exit(0);}
      for(l=0;l<z;l++)
      {
       fputs(c[l],fp);
       m=0;
       while(c[l][m]!='\0')
       {m++;}
       for(n=0;n<=7-m;n++)
       {fputs(" ",fp);}
       fputs(d[l],fp);
       m=0;
       while(d[l][m]!='\0')
       {m++;}
       for(n=0;n<=10-m;n++)
       {fputs(" ",fp);}
       fputs(e[l],fp);
       m=0;
       while(e[l][m]!='\0')
       {m++;}
       for(n=0;n<=10-m;n++)
       {fputs(" ",fp);}
       fputs(f[l],fp);
       m=0;
       while(f[l][m]!='\0')
       {m++;}
       for(n=0;n<=10-m;n++)
       {fputs(" ",fp);}
       fputs(g[l],fp);
       m=0;
       while(g[l][m]!='\0')
       {m++;}
       for(n=0;n<=10-m;n++)
       {fputs(" ",fp);}
       fputs(h[l],fp);
       fputs("\n",fp);
      }
       fclose(fp);
     }
    }
   if(o==0)
    printf("未找到符合条件的联系人\n");
}
  
/***********************************显示所有联系人功能*************************************************/
void put()
{ system("cls");
printf("\n");
printf("\t              欢\n");
printf("\t                 迎*\n");


printf("\t                    使\n");
printf("\t                       用\n");
printf("\t                          通\n");
printf("\t                             讯\n");
printf("\t                                录\n");
printf("\t                                   管\n");
printf("\t                                      理\n");
printf("\t                                         系\n");
printf("\t                                            统\n");
printf("                                                         计1002班   吴楠\n");
char a[9999];
FILE * fp;
fp=fopen("tongxunlu.txt","r");
   if(fp==NULL)
   {printf("opening file error!");
   exit(0);}
   printf("姓名     电话        邮箱        单位        住址        分类\n");
   while(fgets(a,9999,fp)!=NULL)
   printf("%s",a);
   fclose(fp);
}
/***************************查询联系人功能************************************************/
void search()
{
int a=0;
system("cls");
printf("\n");
printf("\t              欢\n");
printf("\t                 迎*\n");


printf("\t                    使\n");
printf("\t                       用\n");
printf("\t                          通\n");
printf("\t                             讯\n");
printf("\t                                录\n");
printf("\t                                   管\n");
printf("\t                                      理\n");
printf("\t                                         系\n");
printf("\t                                            统\n");
printf("                                                         计1002班   吴楠\n");
printf("按姓名查询请按1，按联系方式查询请按2，按群组分类查询请按3,模糊查询请按4\n");
printf("请选择你需要的服务：");
fflush(stdin);
scanf("%d",&a);
         //下面是按姓名查询代码：
if(a==1)
{
   char j[5],n;
   int i=0,o=0;
   FILE * fp;
   fp=fopen("tongxunlu.txt","r");
    if(fp==NULL)
    {printf("opening file error!");
    exit(0);}
    printf("请输入要查询的联系人的姓名：\n");
    fflush(stdin);
     gets(j);
    for(i=0;i<=z;i++)
    {
     if(strcmp(c[i],j)==0)
     {


      printf("%s",c[i]);
      printf(" ");
      printf("%s",d[i]);
      printf(" ");
      printf("%s",e[i]);
      printf(" ");
      printf("%s",f[i]);
      printf(" ");
      printf("%s",g[i]);
      printf(" ");
      printf("%s",h[i]);
      printf("\n");
      o=1;
     }
    }
   if(o==0)
    printf("未找到符合条件的联系人\n");
   fclose(fp);
}
         //下面是按联系方式查询代码：
if(a==2)
{
   char j[5],n;
   int i=0,o=0;
   FILE * fp;
   fp=fopen("tongxunlu.txt","r");
    if(fp==NULL)
    {printf("opening file error!");
    exit(0);}
    printf("请输入要查询的联系人的联系方式（5位数字）：\n");
    fflush(stdin);
     gets(j);
    for(i=0;i<=z;i++)
    {
     if(strcmp(d[i],j)==0)
     {
      printf("%s",c[i]);
      printf(" ");
      printf("%s",d[i]);
      printf(" ");
      printf("%s",e[i]);
      printf(" ");
      printf("%s",f[i]);
      printf(" ");
      printf("%s",g[i]);
      printf(" ");
      printf("%s",h[i]);
      printf("\n");
      o=1;
     }
    }
   if(o==0)
    printf("未找到符合条件的联系人");
   fclose(fp);
}
//下面是实现群组分类查询的代码
if(a==3)
{
   char j[5],n;
   int i=0,o=0;
   printf("请输入要查询的分组：\n");
   fflush(stdin);
   scanf("%s",&j);
   FILE * fp;
   fp=fopen("tongxunlu.txt","r");
    if(fp==NULL)
    {printf("opening file error!");
    exit(0);}
    for(i=0;i<z;i++)
    {
     if(strcmp(h[i],j)==0)
     {
      printf("%s",c[i]);
      printf(" ");
      printf("%s",d[i]);
      printf(" ");
      printf("%s",e[i]);
      printf(" ");
      printf("%s",f[i]);
      printf(" ");
      printf("%s",g[i]);
      printf(" ");
      printf("%s",h[i]);
      printf("\n");
      o=1;
     }
    }
   if(o==0)
    printf("未找到符合条件的联系人");
   fclose(fp);
}
//下面是模糊查询的代码
if(a==4)
{
   char j,n;
   int i=0,o=0;
   printf("请输入要查询联系人的姓：\n");
   fflush(stdin);
   scanf("%c",&j);
   FILE * fp;
   fp=fopen("tongxunlu.txt","r");
    if(fp==NULL)
    {printf("opening file error!");
    exit(0);}
    for(i=0;i<z;i++)
    {
     if(c[i][0]==j)
     {
      printf("%s",c[i]);
      printf(" ");
      printf("%s",d[i]);
      printf(" ");
      printf("%s",e[i]);
      printf(" ");
      printf("%s",f[i]);
      printf(" ");
      printf("%s",g[i]);
      printf(" ");
      printf("%s",h[i]);
      printf("\n");
      o=1;
     }
    }
   if(o==0)
    printf("未找到符合条件的联系人");
   fclose(fp);
}
}