C language course design student information management system (big homework)

One 、 Design function ( The article is for reference only )

1） The system works as a menu
2） Student information entry function （ Student information is saved in files ）－－ Input
3） Student information browsing function －－ Output
4） Student information query function －－ Algorithm
By student number
Search by name
5） Deletion and modification of student information ( optional )

Two 、 Function display

3、 ... and 、 Mind mapping

Four 、 Program source code

#include <stdio.h>
#include <string.h>

struct student// Structure type name  
{
    
long int num;
char name[20];
int age;
char sex[4];
char b[30];
char p[15];
};
int n=0;
struct student stu[100];
struct student *p;// Point to student A pointer variable in  

void lr();
void ll();
void cx();
void xg();
void sc();

int main()
{
    
int z;
printf("+---------------------------+\n");

printf("|  Welcome to the student information management system  |\n");

printf("+---------------------------+\n");

printf(" Tips ： To ensure that your operation is saved , Please exit the system in the normal order ^_^\n");

do
{
    
printf("\n\t\t\t--------------------------------\n");

printf("\t\t\t+  The main menu  |\n");

printf("\t\t\t--------------------------------\n");

printf("\t\t\t+ [1]---- Enter student information  |\n");

printf("\t\t\t+ [2]---- Browse student information  |\n");

printf("\t\t\t+ [3]---- Search for student information  |\n");

printf("\t\t\t+ [4]---- Delete student information  |\n");

printf("\t\t\t+ [5]---- Modify student information  |\n");

printf("\t\t\t+ [0]---- Exit the system  |\n");

printf("\t\t\t--------------------------------\n");

printf(" Please enter your choice ：");

scanf("%d", &z);
switch(z)
{
    
case 0 : break;
case 1 :lr();break;
case 2 :ll();break;
case 3 :cx();break;
case 4 :sc();break;
case 5 :xg();break;
default:printf("\n invalid option !");
}
}
while(z!= 0);
}

void lr()/* Input function */
{
    
int y;
if(n==0)
p=stu;
do
{
    
printf("--------------------\n");

printf(" Please enter the student number :");

scanf("%ld",&p->num);

printf(" Please enter the student's name :");

scanf("%s",p->name);

printf(" Please enter the age of the student :");

scanf("%d",&p->age);

printf(" Please enter the gender of the student :");

scanf("%s",p->sex);

printf(" Please enter the student's address :");

scanf("%s",p->b);

printf(" Please enter the student's phone number :");

scanf("%s",p->p);
n++;
p++;
printf("\n1. Continue to input .\n0. Input complete .\n");
printf(" Please select ：");
scanf("%d",&y);
}
while(y==1);
printf(" Tips ： Input complete ! You have entered a total of %d individual \n",n);

}

void ll()/* Browse functions */
{
    
int i,j;
if(n!=0)
{
     printf(" Total number of students :%d\n", n);
printf(" Student number \t full name \t Age \t Gender \t Address \t\t Telephone \n");
printf("-----------------------------------------------------\n");
for(i=0;i<n;i++)
printf("%ld\t%s\t%d\t%s\t%s\t\t%s\n",stu[i].num,stu[i].name,stu[i].age,stu[i].sex,stu[i].b,stu[i].p);
}
else printf(" Tips : No student data , Please input data ！");
}

void cx()/* Query function */
{
    
int c;
int w,i,j=0;
char name[20];
if(n!=0)
{
    
do{
     printf("\n");
printf("+--------------------+\n");
printf("|  By student number   Please press  1 |\n");
printf("|  Search by name   Please press  2 |\n");
printf("|  Cancel   Please press  0 |\n");
printf("+--------------------+\n");
printf(" Please enter your choice ：");
scanf("%d", &c);
switch(c)
{
    
case 0:break;
case 1:
printf(" Please enter the student number ;");

scanf("%ld", &w);

printf("\n");
for(i=0;i<n;i++)
if(stu[i].num==w)
{
    
printf("\n Student number \t full name \t Age \t Gender \t Address \t\t Telephone \n");

printf("%ld\t%s\t%d\t%s\t%s\t\t%s\n",stu[i].num,stu[i].name,stu[i].age,stu[i].sex,stu[i].b,stu[i].p);
j=1;
}
if(j==0)
printf(" Tips : No student record , Please check ！");
break;
case 2:
printf(" Please enter the student's name ：");

scanf("%s", name);

printf("\n");
for(i=0;i<n;i++)
if(strcmp(name,stu[i].name)==0)
{
    
printf("\n Student number \t full name \t Age \t Gender \t Address \t\t Telephone \n");
j=1;
printf("%ld\t%s\t%d\t%s\t%s\t\t%s\n",stu[i].num,stu[i].name,stu[i].age,stu[i].sex,stu[i].b,stu[i].p);
}
if(j==0)
printf(" Tips : No student record , Please check ！");
break;
default:
printf("\n Tips : invalid option !");
break;
}

}while(c!= 0);
}else printf(" Tips : No student data , Please input data ！");
return;
}

void xg()/* Modify the function */
{
    
long int num;
int i,j,c;
if(n!=0)
{
    
printf(" Please enter the student number of the student you want to modify ：");

scanf("%ld", &num);

printf("\n");

for(i=0;i<n;i++)
if(stu[i].num==num)
j=i;
do{
    
printf(" Please select the information content of the student you want to modify ：\n");

printf("+----------------------+\n");

printf("|  full name   Please press  1 |\n");

printf("|  Age   Please press  2 |\n");

printf("|  Gender   Please press  3 |\n");

printf("|  Student number   Please press  4 |\n");

printf("|  Address   Please press  5 |\n");

printf("|  Telephone   Please press  6 |\n");

printf("|  Cancel   Please press  0 |\n");

printf("+----------------------+\n");

printf(" Please enter your choice ：");

scanf("%d", &c);

printf("\n");
switch(c)
{
    
case 0:break;

case 1:printf(" Please enter a new name ：");

scanf("%s",stu[j].name);

break;
case 2:printf(" Please enter a new age ：");

scanf("%d",&stu[j].age);

break;
case 3:printf(" Please enter a new gender ：");

scanf("%s",stu[j].sex);
break;
case 4:printf(" Please enter a new student number ：");

scanf("%ld",&stu[j].num);
break;
case 5:printf(" Please enter a new address ：");

scanf("%s",stu[j].b);
break;
case 6:printf(" Please enter a new phone number ：");

scanf("%s",stu[j].p);
break;
default:
printf("\n invalid option !");
break;
}

}while(c!= 0);
}else printf(" Tips : No student data , Please input data ！");
}

void sc()/* Delete function */
{
    
long int num;
int i,j,e;
if(n!=0)
{
    
printf(" Student number \t full name \t Age \t Gender \t Address \t\t Telephone \n");

printf("-----------------------------------------------------\n");

for(i=0;i<n;i++)
printf("%ld\t%s\t%d\t%s\t%s\t\t%s\n",stu[i].num,stu[i].name,stu[i].age,stu[i].sex,stu[i].b,stu[i].p);

printf(" Please enter the student number of the student you want to delete ：");

scanf("%ld", &num);
printf("\n");
for(i=0;i<n;i++)
if(num==stu[i].num)
j=i;
if(j!=(n-1))
{
    
for(e=i-1;e<n;e++,j++)
{
    
stu[j].num=stu[j+1].num;
strcpy(stu[j].name,stu[j+1].name);

strcpy(stu[j].sex,stu[j+1].sex);

stu[j].age=stu[j+1].age;
strcpy(stu[j].b,stu[j+1].b);
strcpy(stu[j].p,stu[j+1].p);
n--;p--;
}
}else {
    n--;p--;}
printf(" Tips : Delete completed ！");
}else printf(" Tips : No student data , Please input data ！");
}

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