C语言学生信息管理系统

#include
#include
#include
FILE *fp; 


void menu();
void input();
void del();
void search();
void motify();
void insert();
int total();

int m=total();//总数 


struct mark
{
	int mark1;
	int mark2;
	int mark3;
	double ave;
	double sum;
};
struct student
{
	int num;
	char name[20];
	struct mark app;
}nmm[100];

int main()
{
	menu();
	int n; 
	scanf("%d",&n); 
	while(n)                                         
	{
		
		switch(n)                                           
		{
			case 1: input();    break;
			case 2: del();      break;
			case 3: search();   break;
			case 4: motify();   break;
			case 5: insert();   break;
			case 6: total();    break;
			default:printf("请重新输入"); scanf("%d",&n);    break;
		} 
		scanf("%d",&n);		
	}                                                                                                                                         
}
 
void menu()                                                          
{
	system("cls");                                                     
	printf("nnnnnn");
	printf("ttt  *                学生信息管理系统                    *n");
	printf("ttt *                                                      *n");
	printf("ttt  ******************************************************nn");
	printf("ttt*********************系统管理菜单************************* n");
	printf("ttt     ---------------------   ---------------------   n");
	printf("ttt     *********************************************   n");
	printf("ttt     *  0. exit           * *  1. input record   *   n");
	printf("ttt     *********************************************   n");
	printf("ttt     *  2. delete record  * *  3. search record  *   n");
	printf("ttt     *********************************************   n");
	printf("ttt     *  4. modify record  * *  5. insert record  *   n");
	printf("ttt     *********************************************   n");
	printf("ttt     *  6. total          * *                    *   n");
	printf("ttt     ********************** **********************   n"); 
	printf("ttt     ---------------------   ---------------------   n");
	printf("tttchoose(0-6): ");
}

void input()
{
	if((fp=fopen("data.txt","r+"))==NULL)
	{
		printf("can't open!n");
		exit(0);
	}
	int i,j,n;
	for(i=1;i<=m;i++)
	{
		fscanf(fp,"%d %s %d %d %d %lf %lf",&nmm[i].num,nmm[i].name,&nmm[i].app.mark1,&nmm[i].app.mark2,&nmm[i].app.mark3,&nmm[i].app.sum,&nmm[i].app.ave);
	}
		fclose(fp);	
		fp=fopen("c:\Users\22670\Desktop\data.txt","w");
	printf("please input the number you want to input:");
	scanf("%d",&n);
	m=m+n;
	for(i=m-n+1;i<=m;i++)
	{
		printf("nthe num of the %dTH student:",i);
		scanf("%d",&nmm[i].num );
		printf("nthe name of the %dTH student:",i);
		scanf("%s",nmm[i].name );
		printf("nthe marks of three subject:");
		scanf("%d %d %d",&nmm[i].app.mark1,&nmm[i].app.mark2,&nmm[i].app.mark3);
		nmm[i].app.sum=nmm[i].app.mark1+nmm[i].app.mark2+nmm[i].app.mark3;
		nmm[i].app.ave=nmm[i].app.sum/3;
	}
	for(j=1;j<=m;j++)
	{
		fprintf(fp,"%d %s %d %d %d %.0lf %.0lfn",nmm[j].num,nmm[j].name,nmm[j].app.mark1,nmm[j].app.mark2,nmm[j].app.mark3,nmm[j].app.sum,nmm[j].app.ave);
		printf("ID:%6d NAME:%6s MARK1:%6d MARK2:%6d MARK3:%6d SUM:%6.0lf AVE:%6.0lfn",nmm[j].num,nmm[j].name,nmm[j].app.mark1,nmm[j].app.mark2,nmm[j].app.mark3,nmm[j].app.sum,nmm[j].app.ave);
	}
	if(fclose(fp))
	{
		printf("can't close!n");
		exit(0);
	}	
	printf("ok!");
}

void del()
{
	if((fp=fopen("data.txt","r+"))==NULL)
	{
		printf("can't open!n");
		exit(0);
	}
	int i,j,k,n,choose;
	printf("please input the num you want to delete:");
	scanf("%d",&n);
	if(n>m)printf("nover!please input again!");
	else
	{
		printf("nyou can delete it!sure?(input 1/0)");
		scanf("%d",&choose);
		if(choose)
		{
			for(i=1;i<=m;i++)
				{
				fscanf(fp,"%d %s %d %d %d %lf %lf",&nmm[i].num,nmm[i].name,&nmm[i].app.mark1,&nmm[i].app.mark2,&nmm[i].app.mark3,&nmm[i].app.sum,&nmm[i].app.ave);
				}
			fclose(fp);	
			fp=fopen("c:\Users\22670\Desktop\data.txt","w");
			
			for(j=n+1;j<=m;j++)
				{
					nmm[j-1].num=nmm[j].num;
					strcpy(nmm[j-1].name,nmm[j].name);
					nmm[j-1].app.mark1=nmm[j].app.mark1;
					nmm[j-1].app.mark2=nmm[j].app.mark2;
					nmm[j-1].app.mark3=nmm[j].app.mark3;
					nmm[j-1].app.sum=nmm[j].app.sum;
					nmm[j-1].app.ave=nmm[j].app.ave;
				}
				for(k=1;km)printf("nno find!");
	}
	else
	{
		printf("nplease input the num:");
		scanf("%d",&oo);
		for(j=1;j<=m;j++)
		{
			if(nmm[j].num==oo)
			{
				printf("nfind it!");
				k=j;
				break;
			}	
		}
		if(j>m)printf("nno find!");
	}
	printf("ID:%6d NAME:%6s MARK1:%6d MARK2:%6d MARK3:%6d SUM:%6.0lf AVE:%6.0lf",nmm[k].num,nmm[k].name,nmm[k].app.mark1,nmm[k].app.mark2,nmm[k].app.mark3,nmm[k].app.sum,nmm[k].app.ave);
	if(fclose(fp))
	{
		printf("can't close!n");
		exit(0);
	}
}

void motify()
{
		if((fp=fopen("data.txt","r+"))==NULL)
	{
		printf("can't open!n");
		exit(0);
	}
	int i,j,n,a1,a2,a3;
	printf("please input the num you want to motify:");
	scanf("%d",&n);
	printf("nplease input the renew data:");
	scanf("%d %d %d",&a1,&a2,&a3);
	for(i=1;i<=m;i++)
	{
		fscanf(fp,"%d %s %d %d %d %lf %lf",&nmm[i].num,nmm[i].name,&nmm[i].app.mark1,&nmm[i].app.mark2,&nmm[i].app.mark3,&nmm[i].app.sum,&nmm[i].app.ave);

	}
	
	fclose(fp);	
	fp=fopen("c:\Users\22670\Desktop\data.txt","w");
	
	{
		nmm[n].app.mark1=a1;
		nmm[n].app.mark2=a2;
		nmm[n].app.mark3=a3;
		nmm[n].app.sum=a1+a2+a3;
		nmm[n].app.ave=nmm[n].app.sum/3;
	}
	for(j=1;j<=m;j++)
	{
		fprintf(fp,"%d %s %d %d %d %.0lf %.0lfn",nmm[j].num,nmm[j].name,nmm[j].app.mark1,nmm[j].app.mark2,nmm[j].app.mark3,nmm[j].app.sum,nmm[j].app.ave);
		printf("ID:%6d NAME:%6s MARK1:%6d MARK2:%6d MARK3:%6d SUM:%6.0lf AVE:%6.0lfn",nmm[j].num,nmm[j].name,nmm[j].app.mark1,nmm[j].app.mark2,nmm[j].app.mark3,nmm[j].app.sum,nmm[j].app.ave);
	}
	printf("nok!");
		if(fclose(fp))
	{
		printf("can't close!n");
		exit(0);
	}
}

void insert()
{
	if((fp=fopen("data.txt","r+"))==NULL)
	{
		printf("can't open!n");
		exit(0);
	}
	int i,j,n,oo,a1,a2,a3;
	char nn[20];
	printf("please input the address you want to insert:");
	scanf("%d",&n);
	for(i=1;i<=m;i++)
	{
		fscanf(fp,"%d %s %d %d %d %lf %lf",&nmm[i].num,nmm[i].name,&nmm[i].app.mark1,&nmm[i].app.mark2,&nmm[i].app.mark3,&nmm[i].app.sum,&nmm[i].app.ave);
	}
	
	fclose(fp);	
	fp=fopen("c:\Users\22670\Desktop\data.txt","w");
	
	printf("nplease input the insert data:");
	scanf("%d %s %d %d %d",&oo,nn,&a1,&a2,&a3);
	
	m++;
	
	for(j=n+1;j<=m;j++)
	{
			nmm[j].num=nmm[j-1].num;
			strcpy(nmm[j].name,nmm[j-1].name);
			nmm[j].app.mark1=nmm[j-1].app.mark1;
			nmm[j].app.mark2=nmm[j-1].app.mark2;
			nmm[j].app.mark3=nmm[j-1].app.mark3;
			nmm[j].app.sum=nmm[j-1].app.sum;
			nmm[j].app.ave=nmm[j-1].app.ave;
	}
	{
		nmm[n].num=oo;
		strcpy(nmm[n].name,nn);
		nmm[n].app.mark1=a1;
		nmm[n].app.mark2=a2;
		nmm[n].app.mark3=a3;
		nmm[n].app.sum=a1+a2+a3;
		nmm[n].app.ave=nmm[n].app.sum/3;
	}
		for(j=1;j<=m;j++)
	{
		fprintf(fp,"%d %s %d %d %d %.0lf %.0lfn",nmm[j].num,nmm[j].name,nmm[j].app.mark1,nmm[j].app.mark2,nmm[j].app.mark3,nmm[j].app.sum,nmm[j].app.ave);
		printf("ID:%6d NAME:%6s MARK1:%6d MARK2:%6d MARK3:%6d SUM:%6.0lf AVE:%6.0lfn",nmm[j].num,nmm[j].name,nmm[j].app.mark1,nmm[j].app.mark2,nmm[j].app.mark3,nmm[j].app.sum,nmm[j].app.ave);
	}
	printf("nok!");
	if(fclose(fp))
	{
		printf("can't close!n");
		exit(0);
	}
}

int total()
{
	int m=0;
	char ch[20];
	if((fp=fopen("data.txt","r+"))==NULL)
	{
		printf("can't open!n");
		exit(0);
	}
	while(!feof(fp))
	{
		m++;
		fscanf(fp,"%d %s %d %d %d %lf %lf",&nmm[m].num,nmm[m].name,&nmm[m].app.mark1,&nmm[m].app.mark2,&nmm[m].app.mark3,&nmm[m].app.sum,&nmm[m].app.ave);		
	}
	m--;
	printf("total=%d",m);
	return m;
}