添加函数的问题求大佬解答

#include <stdio.h>
#include <stdlib.h>

 struct lib
{
	char num[20];
	char name[20];
	char writer[20];
	char pub[20];
};

 typedef struct lib L;
 L book[200],books;

FILE *fp;

void add();
void list();
void search();

int main()
{
	int n;
	while(1)
	{
	system("cls");
	printf("Welcome!\n");
	printf("1.list.   \n2.add book.\n"); 
	printf("3.search book.\n4.delete book.\n");
	printf("5.exit.\n ");
	printf("Please input number:\n");
	scanf("%d",&n);
	if(n==1) 
		list();
	else if(n==2)
		add();
	else if(n==3)
		search();
//	else if(n==4)
	//	del();
	else if(n==5)
		exit(0);
	else
	{
		printf("wrong number!\n");
		system("pause");	
	}
	return 0;
}

void search() 
{
	int i=0;
	int m=0;
	char number[20];
	printf("Please input number to search :");
	scanf("%s",number);
	if ((fp=fopen ("12.txt","r"))==NULL)
	{
		printf("File open error!\n");
		exit (0);
	}
	while(!feof(fp))
	{
		
		fscanf(fp,"%s %s %s %s ",book[i].num, book[i].name, book[i].writer, book[i].pub);
		if(book[i].num==number)
		{
			printf("------------------------------------------\n");
			printf("|  number   | book name | author | pulish |\n");
			printf("|  %4s     |%4s       |%5s   |%4s    |\n",book[i].num, book[i].name, book[i].writer, book[i].pub);
			printf("------------------------------------------\n");
			m=1;
			break;
		}
		i++;
	}
	if(m==0) 
		printf("No this book.");
	fclose(fp);
	system("pause");

}

void list()
{
	int i=0;
	if ((fp=fopen ("12.txt","r"))==NULL)
	{
		printf("File open error!\n");
		exit (0);
	}
	printf("------------------------------------------\n");
	printf("|  number   | book name | author | pulish |\n");
	while(!feof(fp))
	{
		
		fscanf(fp,"%s %s %s %s ",book[i].num, book[i].name, book[i].writer, book[i].pub);
		printf("------------------------------------------\n");
		printf("|  %4s     |%4s       |%5s   |%4s    |\n",book[i].num, book[i].name, book[i].writer, book[i].pub);
		i++;
	}
	fclose(fp);
	printf("------------------------------------------\n");
	system("pause");

}



void add()
{	system("cls");
	
	if ((fp=fopen ("12.txt","a"))==NULL)
	{
		printf("File open error!\n");
		exit (0);
	}
	printf("Please input number:");
	scanf("%s",books.num);
	printf("Please input book name:");
	scanf("%s",books.name);
	printf("Please input author:");
	scanf("%s",books.writer);
	printf("Please input publish:");
	scanf("%s",books.pub);
	fprintf(fp,"%s\ %s\ %s\ %s\ ",books.num, books.name, books.writer, books.pub);
	fclose(fp);
}

添加 search函数之后(51) : error C2143: syntax error : missing ';' before 'type' 出现bao'cuo

main函数里的while没写反大括号，修改后程序：

	
#include <stdio.h>
#include <stdlib.h>
 
 struct lib
{
	char num[20];
	char name[20];
	char writer[20];
	char pub[20];
};
 
 typedef struct lib L;
 L book[200],books;
 
FILE *fp;
 
void add();
void list();
void search();
 
int main()
{
	int n;
	while(1)
	{
	system("cls");
	printf("Welcome!\n");
	printf("1.list.   \n2.add book.\n"); 
	printf("3.search book.\n4.delete book.\n");
	printf("5.exit.\n ");
	printf("Please input number:\n");
	scanf("%d",&n);
	if(n==1) 
		list();
	else if(n==2)
		add();
	else if(n==3)
		search();
//	else if(n==4)
	//	del();
	else if(n==5)
		exit(0);
	else
	{
		printf("wrong number!\n");
		system("pause");	
	}
	return 0;
}
}
void search() 
{
	int i=0;
	int m=0;
	char number[20];
	printf("Please input number to search :");
	scanf("%s",number);
	if ((fp=fopen ("12.txt","r"))==NULL)
	{
		printf("File open error!\n");
		exit (0);
	}
	while(!feof(fp))
	{
		
		fscanf(fp,"%s %s %s %s ",book[i].num, book[i].name, book[i].writer, book[i].pub);
		if(book[i].num==number)
		{
			printf("------------------------------------------\n");
			printf("|  number   | book name | author | pulish |\n");
			printf("|  %4s     |%4s       |%5s   |%4s    |\n",book[i].num, book[i].name, book[i].writer, book[i].pub);
			printf("------------------------------------------\n");
			m=1;
			break;
		}
		i++;
	}
	if(m==0) 
		printf("No this book.");
	fclose(fp);
	system("pause");
 
}
 
void list()
{
	int i=0;
	if ((fp=fopen ("12.txt","r"))==NULL)
	{
		printf("File open error!\n");
		exit (0);
	}
	printf("------------------------------------------\n");
	printf("|  number   | book name | author | pulish |\n");
	while(!feof(fp))
	{
		
		fscanf(fp,"%s %s %s %s ",book[i].num, book[i].name, book[i].writer, book[i].pub);
		printf("------------------------------------------\n");
		printf("|  %4s     |%4s       |%5s   |%4s    |\n",book[i].num, book[i].name, book[i].writer, book[i].pub);
		i++;
	}
	fclose(fp);
	printf("------------------------------------------\n");
	system("pause");
 
}
 
 
 
void add()
{	system("cls");
	
	if ((fp=fopen ("12.txt","a"))==NULL)
	{
		printf("File open error!\n");
		exit (0);
	}
	printf("Please input number:");
	scanf("%s",books.num);
	printf("Please input book name:");
	scanf("%s",books.name);
	printf("Please input author:");
	scanf("%s",books.writer);
	printf("Please input publish:");
	scanf("%s",books.pub);
	fprintf(fp,"%s\ %s\ %s\ %s\ ",books.num, books.name, books.writer, books.pub);
	fclose(fp);
}

试下53、54这两行合并成1行

int i=0,m=0;