求大神帮修改，我是菜鸟

#include
#include
#include
#include

//定义试题结构体
typedef struct node
{
int id; //试题编号
char problem; //题干
char optionA; //选项A
char optionB; //选项B
char optionC; //选项C
char optionD; //选项D
char ans; //答案
struct node*pNext; //指向下一个试题的指针
}Node;

void insert() //录入试题
{
void insertNode(int id,char problem[200],char optionA[100],char optionB[100],
char optionC[100],char optionD[100],char ans);
int id;
char problem[200];
char optionA[100];
char optionB[100];
char optionC[100];
char optionD[100];
char ans;
char choose='Y';
while(toupper(choose)=='Y')
{printf("\n**********录入试题**********");
printf("\n请输入试题编号:");
scanf("%d",&id);
getchar();
printf("请输入题干：");
gets(problem);
printf("请输入选项A:");
gets(optionA);
printf("请输入选项B：");
gets(optionB);
printf("请输入选项C：");
gets(optionC);
printf("请输入选项D：");
gets(optionD);
ans=getchar();
getchar();
insertNode(id,problem,optionA,optionB,optionC,optionD,toupper(ans));
printf("\n继续录入(Y\N)?");
scanf("%c",&choose);
getchar();
}

}Node*pHead=NULL; //存放试题的链表的首节点地址
void view() //查看试题
{
Node*tempNode=pHead;
while(tempNode!=NULL)
{printf("%d\n","%s\n","%s\n","&s\n","%s\n","%s\n","%s\n",tempNode->id,tempNode->problem,
tempNode->optionA,tempNode->optionB,tempNode->optionC,tempNode->optionD,tempNode->ans);}
}
void save() //保存试题
{
Node*tempNode=pHead;
freopen("D:\****","w",stdout);
while(tempNode!=NULL)
{printf("%d\n",tempNode->id);
printf("%s\n",tempNode->problem);
printf("%s\n",tempNode->optionA);
printf("%s\n",tempNode->optionB);
printf("%s\n",tempNode->optionC);
printf("%s\n",tempNode->optionD);
printf("%s\n",tempNode->ans);
tempNode=tempNode->pNext;
}
fclose(stdout);
freopen("CON","w",stdout);
}
//申请储存空间
void insertNode(int id,char problem[200],char optionA[100],char optionB[100],char optionC[100],char optionD[100],char ans)
{
Node*pNew=(Node*)malloc(sizeof(Node));
pNew->id=id;
pNew->problem;
pNew->optionA;
pNew->optionB;
pNew->optionC;
pNew->optionD;
pNew->ans;
pNew->pNext=NULL;
if(pHead==NULL)
pHead=pNew;
else
{Node*tempNode=pHead;
pHead->pNext=pNew;
}
}
void mod() //修改试题
{ void view();
int id; //题号
char problem[200]; //题干
char optionA[100]; //选项A
char optionB[100]; //选项B
char optionC[100]; //选项C
char optionD[100]; //选项D
char ans; //答案
char choose;
Node*tempNode=pHead;

Node*previousNode=pHead;
printf("\n请输入要修改的题号：");
scanf("%d",&id);
getchar();

while(tempNode!=0)  //从第一题开始找，直到找到指定的试题
{
if(id==tempNode->id)
    break;
previousNode=tempNode;    
tempNode=tempNode->pNext;  
}
if(tempNode==NULL)
{
    printf("该试题不存在");
    return;
}
//显示试题信息    
printf("%d\n","%s\n","%s\n","&s\n","%s\n","%s\n","%s\n",tempNode->id,tempNode->problem,
tempNode->optionA,tempNode->optionB,tempNode->optionC,tempNode->optionD,tempNode->ans);

printf("请输入修改后的试题信息");
printf("\n请输入试题编号:");
      scanf("%d",&id);
      getchar();
      printf("请输入题干：");
      gets(problem);
      printf("请输入选项A:");
      gets(optionA);
      printf("请输入选项B：");
      gets(optionB);
      printf("请输入选项C：");
      gets(optionC);
      printf("请输入选项D：");
      gets(optionD);
      ans=getchar();
      getchar();
      printf("是否修改(Y\N)?");
      scanf("%c",&choose);
      getchar();
      if(toupper(choose)=='Y')
      {
           insertNode(id,problem,optionA,optionB,optionC,optionD,toupper(ans));
      }
      //显示所有试题
    view();

}
void del() //删除试题
{

int id;
char choose;
Node*tempNode=pHead; //存放试题链表的首地址，即第一道试题（结构体）的地址
Node*previousNode=pHead; //指定试题的上一道试题的地址
printf("\请输入要删除的试题题号：");
scanf("%d",&id);
getchar();
while(tempNode!=0) //从第一题开始找，直到找到指定的试题
{
if(id==tempNode->id)
break;
previousNode=tempNode; //当前节点是下一个节点的前节点
tempNode=tempNode->pNext; //指向下一节点
}
if(tempNode==NULL)
{
printf("该试题不存在");
return;
}
//显示试题信息

printf("%d\n","%s\n","%s\n","&s\n","%s\n","%s\n","%s\n",tempNode->id,tempNode->problem,
tempNode->optionA,tempNode->optionB,tempNode->optionC,tempNode->optionD,tempNode->ans);
printf("要删除该题么(Y\N)?");
scanf("%c",choose);
getchar();
if(toupper(choose)=='Y')
{
//tempNode是要删除的试题的地址
if(tempNode==pHead)
pHead=tempNode->pNext;
else
previousNode->pNext=tempNode->pNext;
free(tempNode);
}

}
void test(); //考试

int main()
{ int a=0;
char choose=' ';
void insert();
void view();
void save();
void mod();

void del();
void test();
while(choose!='0')
{
printf("\n**********主菜单**********");
printf("\n 欢迎进入考试系统");
printf("\n 1：试题管理");
printf("\n 2：开始考试");
printf("\n 3：退出");
printf("\n**************************");
printf("\n请选择：");
choose=getchar();
getchar();
switch(choose)
{
case '1':
printf("*****************************\n");
printf("**********1.新增题目*********\n");
printf("**********2.删除题目*********\n");
printf("**********3.修改题目*********\n");
printf("**********4.查看题目*********\n");
printf("**********5.保存*************\n");
printf("**********6.返回上一级*******\n");
printf("请选择：");
scanf("%d",a);

            switch(a)
            {
            case 1:
                insert();
                break;
            case 2:
                del();
                break;
            case 3:
                mod();
                break;
            case 4:
                view();
                break;
            case 5:
                break;
            case 6:
                break;

            }

            break;
        case '2':
            break;
        case '3':
            break;
        default :
            break;

      }

}

return 0;

}

 错误太多了，编译都编译不了
你要用反斜杠，要用两个
printf("\n继续录入(Y\N)?");
printf("是否修改(Y\N)?");
printf("\请输入要删除的试题题号：");
char problem;
要么是char * problem;要么是char problem[100];不然怎么装下一个题目？

如果先采纳本回答，可以帮你修改修改。

#include
#include
#include
#include
//#include

//定义试题结构体
typedef struct node
{
int id; //试题编号
char problem[512]; //题干
char optionA[256]; //选项A
char optionB[256]; //选项B
char optionC[256]; //选项C
char optionD[256]; //选项D
char ans[4]; //正确答案
char choose[4];//学员答案
struct node*pNext; //指向下一个试题的指针
}Node;

Node *pHead = NULL; //存放试题的链表的首节点地址
Node *pTail = NULL;

//申请储存空间
void insertNode(int id, char *problem, char *optionA, char *optionB, char *optionC, char *optionD, char *ans)
{
Node *pNew = (Node *)malloc(sizeof(Node));
pNew->id = id;
strcpy(pNew->problem, problem);
strcpy(pNew->optionA, optionA);
strcpy(pNew->optionB, optionB);
strcpy(pNew->optionC, optionC);
strcpy(pNew->optionD, optionD);
strcpy(pNew->ans, ans);
pNew->pNext=NULL;

if (pHead == NULL)
{
pHead = pNew;
pTail = pHead;
}
else
{

//尾插入法
pTail->pNext = pNew;
pTail = pNew;

//头插入法
//pNew->pNext = pHead;
//pHead = pNew;

}
}

//录入试题
void insert()
{
int id;
char problem[512];
char optionA[256];
char optionB[256];
char optionC[256];
char optionD[256];
char ans[4];
char choose = 'Y';

while(toupper(choose)=='Y')
{
printf("\n**********录入试题**********");
printf("\n请输入试题编号:");
scanf("%d",&id);
getchar();//读取换行符

printf("请输入题干：");
gets(problem);

printf("请输入选项A:");
gets(optionA);

printf("请输入选项B：");
gets(optionB);

printf("请输入选项C：");
gets(optionC);

printf("请输入选项D：");
gets(optionD);

printf("请输入答案:");
gets(ans);

if ((id > 0) && (strlen(problem) > 0))
{
    insertNode(id, problem, optionA, optionB, optionC, optionD, ans);
}
else
{
    printf("试题内容错误，请重新输入\n");   
}

printf("\n继续录入(Y\\N)?");
scanf("%c",&choose);
getchar();

}
}

//查看试题
void view()
{
Node *tempNode = pHead;

while(tempNode != NULL)
{
printf("id:%d\n,problem:%s\n,optionA:%s\n,optionB:%s\n,optionC:%s\n,optionD:%s\n,ans:%s\n",tempNode->id,tempNode->problem,
tempNode->optionA,tempNode->optionB,tempNode->optionC,tempNode->optionD,tempNode->ans);

tempNode = tempNode->pNext;

}
}

void save() //保存试题
{
Node *tempNode=pHead;

//freopen("D:\exam.txt","w",stdout);
FILE *fp = fopen("/Users/dingyc/Desktop/crash/exam.txt", "w+");

while(tempNode!=NULL)
{
fprintf(fp, "%d\n",tempNode->id);
fprintf(fp, "%s\n",tempNode->problem);
fprintf(fp, "%s\n",tempNode->optionA);
fprintf(fp, "%s\n",tempNode->optionB);
fprintf(fp, "%s\n",tempNode->optionC);
fprintf(fp, "%s\n",tempNode->optionD);
fprintf(fp, "%s\n",tempNode->ans);
fprintf(fp, "********************");

tempNode=tempNode->pNext;

}

fclose(fp);
fp = NULL;

//fclose(stdout);
//freopen("CON","w",stdout);
}

//修改试题
void mod()
{
void view();

int id; //题号
char problem[200]; //题干
char optionA[100]; //选项A
char optionB[100]; //选项B
char optionC[100]; //选项C
char optionD[100]; //选项D
char ans[4]; //答案
char choose;

Node *tempNode=pHead;

printf("\n请输入要修改的题号：");
scanf("%d", &id);
getchar();

while(tempNode!=0) //从第一题开始找，直到找到指定的试题
{
if(id==tempNode->id)
{
break;
}

tempNode=tempNode->pNext;  

}

if(tempNode==NULL)
{
printf("该试题不存在\n");
return;
}

//显示试题信息
printf("id:%d\n,problem:%s\n,optionA:%s\n,optionB:%s\n,optionC:%s\n,optionD:%s\n,ans:%s\n",tempNode->id,tempNode->problem,
tempNode->optionA,tempNode->optionB,tempNode->optionC,tempNode->optionD,tempNode->ans);

printf("请输入修改后的试题信息");
printf("\n请输入试题编号:");
scanf("%d",&id);
getchar();

printf("请输入题干：");
gets(problem);

printf("请输入选项A:");
gets(optionA);

printf("请输入选项B：");
gets(optionB);

printf("请输入选项C：");
gets(optionC);

printf("请输入选项D：");
gets(optionD);
gets(ans);

printf("是否修改(Y\N)?");
scanf("%c", &choose);
getchar();

if(toupper(choose)=='Y')
{
//insertNode(id,problem,optionA,optionB,optionC,optionD,ans);

//tempNode->id = id;
strcpy(tempNode->problem, problem);
strcpy(tempNode->optionA, optionA);
strcpy(tempNode->optionB, optionB);
strcpy(tempNode->optionC, optionC);
strcpy(tempNode->optionD, optionD);
strcpy(tempNode->ans, ans);

}

//显示所有试题
view();
}

//删除试题
void del()
{
int id;
char choose;
Node *tempNode=pHead; //存放试题链表的首地址，即第一道试题（结构体）的地址
Node *previousNode=pHead; //指定试题的上一道试题的地址

printf("\n请输入要删除的试题题号：");
scanf("%d",&id);
getchar();

while(tempNode != NULL) //从第一题开始找，直到找到指定的试题
{
if(id==tempNode->id)
{
break;
}

previousNode=tempNode; //当前节点是下一个节点的前节点
tempNode=tempNode->pNext; //指向下一节点

}

if(tempNode==NULL)
{
printf("该试题不存在\n");
return;
}

//显示试题信息

printf("id:%d\n,problem:%s\n,optionA:%s\n,optionB:%s\n,optionC:%s\n,optionD:%s\n,ans:%s\n",tempNode->id,tempNode->problem,
tempNode->optionA,tempNode->optionB,tempNode->optionC,tempNode->optionD,tempNode->ans);

printf("要删除该题么(Y\N)?");
scanf("%c",&choose);
getchar();

if(toupper(choose)=='Y')
{

previousNode->pNext=tempNode->pNext;

free(tempNode);

}
}

//测试
void exam()
{
Node *tempNode = pHead;

printf("开始进行测试=========\n");

while (NULL != tempNode)
{
printf("\n\n\n");
printf("题目：id:%d\n,problem:%s\n,optionA:%s\n,optionB:%s\n,optionC:%s\n,optionD:%s\n",tempNode->id,tempNode->problem,
tempNode->optionA,tempNode->optionB,tempNode->optionC,tempNode->optionD);
printf("请输入答案:");
gets(tempNode->choose);

tempNode = tempNode->pNext;

}

printf("考试完毕=========\n");
}

//统计得分
void calcScore()
{
int iSucc = 0;
Node *tempNode = pHead;

while (tempNode != NULL)
{
printf("=====================\n");
printf("id:%d\n,problem:%s\n,optionA:%s\n,optionB:%s\n,optionC:%s\n,optionD:%s\n,ans:%s\n,choose:%s\n",tempNode->id,tempNode->problem,
tempNode->optionA,tempNode->optionB,tempNode->optionC,tempNode->optionD,tempNode->ans,tempNode->choose);

if (0 == strcmp(tempNode->ans, tempNode->choose))
{
    iSucc++;
}

tempNode = tempNode->pNext;

}

printf("共答对:%d题\n", iSucc);
}

int main()
{
int a=0;
char choose='Y';

while(choose != '0')
{
printf("\n**********主菜单**********");
printf("\n 欢迎进入考试系统");
printf("\n 1：试题管理");
printf("\n 2：开始考试");
printf("\n 3：退出");
printf("\n**************************");
printf("\n请选择：");
choose=getchar();
getchar();

switch(choose)
{
    case '1':
        {
            int iLoop = 1;

            while (iLoop)
            {
                printf("*****************************\n");
                printf("**********1.新增题目*********\n");
                printf("**********2.删除题目*********\n");
                printf("**********3.修改题目*********\n");
                printf("**********4.查看题目*********\n");
                printf("**********5.保存*************\n");
                printf("**********6.返回上一级*******\n");
                printf("请选择：");
                scanf("%d",&a);

                switch(a)
                {
                    case 1:
                        {
                            insert();
                        }
                        break;

                    case 2:
                        {
                            del();
                        }
                        break;

                    case 3:
                        {
                            mod();
                        }
                        break;

                    case 4:
                        {
                            view();
                        }
                        break;

                    case 5:
                        {
                            save();
                        }
                        break;

                    case 6:
                        {
                            iLoop = 0;
                        }
                        break;
                }
            }
        }
        break;

    case '2':
        {
            exam();
        }
        break;

    case '3':
        {
            calcScore();
            exit(0);
        }
        break;

    default :
        {
            //
        }
        break;
}

}

return 0;
}

不好意思，发了好几个重复了。

char problem[200]; //题干
char optionA[100]; //选项A
char optionB[100]; //选项B
char optionC[100]; //选项C
char optionD[100]; //选项D
char ans[4]; //答案
这个要修改