C语言的学生成绩管理系统

 一、系统功能模块图

 二、代码

#include<stdio.h>
#include<string.h> 
#include<stdlib.h>
#define MAX 1000
  
struct Student     /*定义学生结构体*/
{ 
     char ID[20];     //学号 
     char Name[20];   //姓名 
     char sex[10];    //性别 
     char ban[20];    //班别 
     int nian;        //年龄 
     float Mark1;     //分数1 
     float Mark2;     //分数2 
     float Mark3;     //分数3 
     float Average;   //平均分 
     float zong;      //总分 
}; 


void menu1()
{
	            printf("**********************************************************\n");
				printf("********1.修改学号------------2.修改性别******************\n");
				printf("********3.修改班别------------4.修改年龄******************\n");
			    printf("********5.修改成绩1-----------6.修改成绩2*****************\n");
				printf("*********************7.修改成绩3**************************\n");
				printf("*********************8.退出本菜单*************************\n");
				printf("**********************************************************\n");
				printf("                    请输入选择："); 	
}

struct Student students[1000]; /*声明学生数组及学生最大数量*/  
int num=0; 
   
 
float Avg(struct Student stu) /*求平均值*/ 
{ 
   return (stu.Mark1+stu.Mark2+stu.Mark3)/3;  
} 


float Zong(struct Student stu) /*求总分*/ 
{ 
   return (stu.Mark1+stu.Mark2+stu.Mark3);  
} 


float Student_zuimax()  //总分最大值 
{   
    int i;
    float max;
	max=students[0].zong;
  for (i=1;i<num-1;i++)
  {
  	if(max<students[i].zong)
  	{  
  		max=students[i].zong;
	}
  }
  printf("最高分:%f\n\n",max);
  printf(" 该学生信息为：\n");
  printf("%10s%10s%10s%10s%10s%10s%10s%10s%10s%10s\n","学号","姓名","性别","班别","年龄","成绩1","成绩2","成绩3","平均成绩","总分"); 
  printf("-----------------------------------------------------------------------------------------------------------------------------------\n"); 
  for (i=0;i<num;i++) 
     {
     	if(max==students[i].zong)
         printf("%10s%10s%10s%10s%10d%10.2f%10.2f%10.2f%10.2f%10.2f\n",students[i].ID,students[i].Name,students[i].sex,students[i].ban,
		 students[i].nian, students[i].Mark1,students[i].Mark2,students[i].Mark3,students[i].Average,students[i].zong);
     }   
}

float Student_zuimin()   //总分最小值 
{
	 int i;
	 float min;
	 min=students[0].zong;
	  for (i=0;i<num-1;i++)
  {
  	if(min>students[i+1].zong)
  	{  
  		min=students[i+1].zong;
	}
  }
  printf("最低分:%f\n\n",min);
  printf(" 该学生信息为：\n");
   printf("%10s%10s%10s%10s%10s%10s%10s%10s%10s%10s\n","学号","姓名","性别","班别","年龄","成绩1","成绩2","成绩3","平均成绩","总分"); 
  printf("-----------------------------------------------------------------------------------------------------------------------------------\n"); 
  for (i=0;i<num;i++) 
     {
     	if(min==students[i].zong)
         printf("%10s%10s%10s%10s%10d%10.2f%10.2f%10.2f%10.2f%10.2f\n",students[i].ID,students[i].Name,students[i].sex,students[i].ban,
		 students[i].nian, students[i].Mark1,students[i].Mark2,students[i].Mark3,students[i].Average,students[i].zong);
     }   

}
 
  
int Student_SearchByIndex(char id[]) /*通过学号返回数组下标*/  
{ 
     int i; 
     for (i=0;i<num;i++) 
     { 
         if (strcmp(students[i].ID,id)==0) 
         { 
              return i; 
         } 
     } 
     return -1; 
} 
 

int Student_SearchByName(char name[]) /*通过姓名返回数组下标*/  
{ 
     int i; 
     for (i=0;i<num;i++) 
     { 
         if (strcmp(students[i].Name,name)==0) 
         { 
              return i; 
         } 
     } 
     return -1;
}

   
void Student_DisplaySingle(int index) /*显示单条学生信息*/ 
{ 
     printf("%10s%10s%10s%10s%10s%10s%10s%10s%10s%10s\n","学号","姓名","性别","班别","年龄","成绩1","成绩2","成绩3","平均成绩","总分"); 
     printf("-----------------------------------------------------------------------------------------------------------------------------------\n"); 
     printf("%10s%10s%10s%10s%10d%10.2f%10.2f%10.2f%10.2f%10.2f\n",students[index].ID,students[index].Name,students[index].sex,students[index].ban,
	 students[index].nian,students[index].Mark1,students[index].Mark2,students[index].Mark3,students[index].Average,students[index].zong); 
} 


void Student_Display() /*显示全部学生信息*/ 
{ 
 
     int i; 
     printf("%10s%10s%10s%10s%10s%10s%10s%10s%10s%10s\n","学号","姓名","性别","班别","年龄","成绩1","成绩2","成绩3","平均成绩","总分"); 
     printf("-----------------------------------------------------------------------------------------------------------------------------------\n"); 
     for (i=0;i<num;i++) 
     {
         printf("%10s%10s%10s%10s%10d%10.2f%10.2f%10.2f%10.2f%10.2f\n",students[i].ID,students[i].Name,students[i].sex,students[i].ban,
		 students[i].nian, students[i].Mark1,students[i].Mark2,students[i].Mark3,students[i].Average,students[i].zong);
     } 
} 
 
     
void Student_Init() /*添加学生信息*/ 
{ 
     while(1) 
     { 
         printf("请输入学号:"); 
         scanf("%s",&students[num].ID); 
         getchar(); 
         printf("请输入姓名:"); 
         scanf("%s",&students[num].Name); 
         getchar(); 
         printf("请输入性别:");
         scanf("%s",&students[num].sex); 
         getchar();
         printf("请输入班别:");
         scanf("%s",&students[num].ban); 
         getchar();
         printf("请输入年龄:");
		 scanf("%d",&students[num].nian); 
         getchar();  
         printf("请输入成绩1:"); 
         scanf("%f",&students[num].Mark1); 
         getchar(); 
         printf("请输入成绩2:"); 
         scanf("%f",&students[num].Mark2); 
         getchar(); 
         printf("请输入成绩3:"); 
         scanf("%f",&students[num].Mark3); 
         getchar(); 
         students[num].Average=Avg(students[num]); 
         students[num].zong=Zong(students[num]);
         num++; 
         printf("是否继续?(y/n)"); 
         if (getchar()=='n') 
         { 
              break; 
         } 
     } 
} 


void Student_Modify1()    //修改单个学生信息 
{
	int i,k,j,g;
	float q;
	char number[100],s1[100];
    printf("请输入需要修改的学生姓名：");
    getchar();
    gets(s1);
    for(j=1;j<MAX;j++)
    {
    	for(i=0;i<num;i++)
    	{
		
         if(strcmp(students[i].Name,s1)==0)
        	{
			    menu1();
			    scanf("%d",&k);
				switch(k)
				{
					case 1:
						printf("请输入新的学号：");
						getchar();
						gets(number);
						strcpy(students[i].ID,number);
						break;
					case 2:
						printf("请输入新的性别：");
						getchar();
						gets(number);
						strcpy(students[i].sex,number);
						break;
					case 3:
						printf("请输入新的班别：");
						getchar();
						gets(number);
						strcpy(students[i].ban,number);
						break;
					case 4:
						printf("请输入新的年龄：");
						scanf("%d",&g);
						students[i].nian=g;
						break;
					case 5:
						printf("请输入新的分数1：");
						scanf("%f",&q);
						students[i].Mark1=q;
						break;
					case 6:
						printf("请输入新的分数2：");
						scanf("%f",&q);
						students[i].Mark2=q;
						break;
					case 7:
						printf("请输入新的分数3：");
						scanf("%f",&q);
						students[i].Mark3=q;
						break;
					case 8:return;
					default:printf("输入错误，退出本菜单！\n");
					break;
				}
				students[i].Average=Avg(students[i]);
                students[i].zong=Zong(students[i]);
					if(k>0&&k<8)
				{
					printf("修改成功！\n");
			    	break;
			    } 
			
			 }
			else
            {
	            printf("未找到该学生，请重新输入学生姓名：");
	            gets(s1);
	            break;
            }  
		 }
	}	
} 

  
void Student_Modify2() /*修改整一个学生信息*/  
{ 
     float mark1,mark2,mark3; 
     while(1) 
     { 
         char id[20]; 
         int index; 
         printf("请输入要修改的学生的学号:"); 
         scanf("%s",&id); 
         getchar(); 
         index=Student_SearchByIndex(id); 
         if (index==-1)
         { 
             printf("学生不存在!\n");
         } 
           else 
         { 
              printf("你要修改的学生信息为:\n"); 
              Student_DisplaySingle(index); 
              printf("-- 请输入新值--\n"); 
              printf("请输入学号:"); 
              scanf("%s",&students[index].ID); 
              getchar(); 
              printf("请输入姓名:"); 
              scanf("%s",&students[index].Name); 
              getchar(); 
              printf("请输入性别:"); 
              scanf("%s",&students[index].sex); 
              getchar();
              printf("请输入班别:"); 
              scanf("%s",&students[index].ban); 
              getchar();
			  printf("请输入年龄:"); 
              scanf("%d",&students[index].nian); 
              getchar();  
              printf("请输入成绩1:"); 
              scanf("%f",&students[index].Mark1); 
              getchar(); 
              printf("请输入成绩2:"); 
              scanf("%f",&students[index].Mark2); 
              getchar();
              printf("请输入成绩3:"); 
              scanf("%f",&students[index].Mark3); 
              getchar(); 
              students[index].Average=Avg(students[index]);
			  students[index].zong=Zong(students[index]); 
         } 
         printf("是否继续?(y/n)"); 
         if (getchar()=='n') 
         { 
              break; 
         } 
	 }    
} 

void Student_Modify()    //修改 
{
	int w;
	printf("-----------1.修改单个学生信息 -------------\n");
	printf("-----------2.修改整一个学生信息------------\n\n");
	printf("             请输入选择：");
	scanf("%d",&w); 
	switch(w)
	{
		case 1:
		   Student_Modify1();break;//修改单个学生信息
		case 2:
		   Student_Modify2();break;	//修改整一个学生信息
	}
 } 
  
void Student_Delete() /*删除学生信息*/ 
{ 
     int i; 
     while(1) 
     { 
         char id[20];
         int index; 
         printf("请输入要删除的学生的学号:"); 
         scanf("%s",&id); 
         getchar(); 
         index=Student_SearchByIndex(id); 
         if (index==-1) 
         { 
              printf("学生不存在!\n"); 
         } 
         else 
         { 
              printf("你要删除的学生信息为:\n"); 
              Student_DisplaySingle(index); 
              printf("是否真的要删除?(y/n)"); 
              if (getchar()=='y') 
              { 
                    for (i=index;i<num-1;i++) 
                   { 
                       students[i]=students[i+1];
                   } 
                   num--; 
              } 
                 getchar(); 
         } 
         printf("   删除成功\n    是否继续?(y/n)"); 
         if (getchar()=='n') 
         { 
              break; 
         } 
     } 
} 


void student_quandelete()   //清除所有学生信息 
{   int i;
   printf("      已清除所有学生信息\n");
	for(i=num;i>0;i--)
	{
		students[i-1]=students[i];
		num--;
	}
}
 
 
void  Student_Selectxue()/*按学号查找*/
{ 
     while(1) 
     { 
         char xue[20]; 
         int index; 
         printf("请输入要查找的学生的学号:"); 
         scanf("%s",&xue); 
         getchar(); 
         index=Student_SearchByIndex(xue); 
         if (index==-1) 
         { 
              printf("学生不存在!\n"); 
         } 
         else 
         { 
              printf("你要查询的学生信息为:\n"); 
              Student_DisplaySingle(index); 
         } 
         printf("是否继续?(y/n)"); 
         if (getchar()=='n') 
         { 
              break; 
         } 
     } 
}  
 
void  Student_Selectname()/*按姓名查询*/
{ 
     while(1) 
     { 
         char name[20]; 
         int index; 
         printf("请输入要查询的学生的姓名:"); 
         scanf("%s",&name); 
         getchar(); 
         index=Student_SearchByName(name); 
         if (index==-1) 
         { 
              printf("学生不存在!\n"); 
         } 
         else 
         { 
              printf("你要查询的学生信息为:\n"); 
              Student_DisplaySingle(index); 
         } 
         printf("是否继续?(y/n)"); 
         if (getchar()=='n') 
         { 
              break; 
         } 
     } 
} 


void Student_Select()       //查找 
{
	int h;
	printf("    1.按学号查找\n");
	printf("    2.按姓名查询\n");
	printf("      请输入选择:");
	scanf("%d",&h);
	switch(h)
	{
		case 1:Student_Selectxue();break;  //按学号查找 
		case 2:Student_Selectname();break;  //按姓名查询
	}
}


void Student_SortByzong() /*按总分值排序*/ 
{ 
     int i,j; 
     struct Student tmp; 
     for (i=0;i<num;i++) 
     { 
         for (j=1;j<num-i;j++) 
         { 
               if (students[j-1].zong<students[j].zong) 
              { 
                   tmp=students[j-1]; 
                   students[j-1]=students[j]; 
                   students[j]=tmp; 
              } 
         } 
    } 
}


void Student_zuizhi()       //成绩最高分和最低分 
{
	int i;
	printf("****1.最高分：\n");
	printf("****2.最低分：\n");
	printf("*****请选择");
	scanf("%d",&i);
	getchar();
	switch(i)
	{
	case 1:Student_zuimax();break;   //最高分 
	case 2:Student_zuimin();break;   //最低分 
    } 
}


void menu()//  主菜单
{
    printf("\n-----------学生成绩管理系统---------------\n");
	printf("**********  1. 添加学生信息    ***********\n");
	printf("**********  2. 修改学生信息    ***********\n"); 
	printf("**********  3. 删除学生信息    ***********\n"); 
	printf("**********  4. 显示学生信息    ***********\n"); 
	printf("**********  5. 查找学生信息    ***********\n"); 
	printf("**********  6. 清空学生信息    ***********\n");  
	printf("**********  7. 最高分最低分    ***********\n"); 
	printf("**********  8. 总分排序        ***********\n"); 
	printf("**********  9. 统计学生数量    ***********\n");
	printf("**********  10. 退出           ***********\n");  
    printf("******************************************\n"); 
 } 

  
main() /*主程序*/ 
{ 
     int choice; 
     while(1) 
     {  int d;
         menu();
         printf("         请选择功能(1-10):"); 
         scanf("%d",&choice); 
         getchar();
		 if(choice>10)
		 {
		     printf("输入错误，请重新输入：");	
		  }
		 else
		 { 
         switch(choice) 
         { 
         case 1: 
              Student_Init();            //添加学生信息 
              break; 
         case 2: 
              Student_Modify();          //修改学生信息
              break; 
         case 3: 
              Student_Delete();          //删除学生信息
              break; 
         case 4: 
              Student_Display();         //显示学生信息
              break; 
         case 5:
		      Student_Select();         //查找学生信息
			  break;
         case 6:
         	student_quandelete();       //清空学生信息
              break; 
         case 7: Student_zuizhi();break;//最高分最低分
         case 8:Student_SortByzong();   //总分排序
              Student_Display(); break;
         case 9:
         	printf("学生总数量为：%d\n统计如下：\n",num);//统计 
         	Student_SortByzong();
         	Student_Display();
         	break;
         case 10:exit(0); break;         //退出 	
         } 
     }
     } 
} 

三、效果截图

1.添加学生信息:

再次添加学生信息：

2.修改学生信息:

修改的第一个功能：

第一个功能的其他修改学生信息：

修改的第二个功能：

3.删除学生信息:

4.显示学生信息:

5.查找学生信息:

查找的第二个功能：

6.清空学生信息:

7.最高分最低分:

最高分：

最低分：

8.总分排序:

9.统计学生数量:

10.退出: