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On the compilation of student management system of C language course (simple version)
2022-07-26 10:06:00 【SingleDog_ seven】
Curriculum requirements 
According to the requirements of course design , We need to add the following functions to our management system ：1, Menu mode works ;2, Input function ;3, Browsing function ;4, Query function ;5, Sorting function ;6, Delete function ;7, Modify the function ;8, Save function .
We will complete the writing step by step with the idea of modularization .
Construction of structure
We already know the requirements of the curriculum , According to the requirements, we can build the following structure ：
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define N 30
int n=0; // Create global variables to control the number of people entered
struct student{ // Defining structure
char sumber[10]; // Student number
char name[15]; // full name
int age; // Age
char gender; // Gender
char birthday; // date of birth
char site; // Address
int sum; // Phone number
char mail; // email
}stu[N];
After building the structure , We will write module words for functions ;
menu
The first is the preparation of the menu ：
void show() // Show menu
{
printf(" ----------1. Enter student information ----------\n");
printf(" ----------2. Search for student information ----------\n");
printf(" ----------3. Browse student information ----------\n");
printf(" ----------4. Modify student information ----------\n");
printf(" ----------5. Save student information ----------\n");
printf(" ----------6. Delete student information ----------\n");
printf(" --------------0. sign out --------------\n");
}Use several consecutive outputs to complete the preparation of the menu .
Enter student information
We use entering function ：
int entering() // Enter student information
{
int a;
printf(" Please enter the number of students to add ：");
scanf("%d",&a);
int i;
for(i=n;i<a+n;i++) // Add to the existing number
{
printf(" Please enter the student number : ");
scanf("%s", stu[i].sumber);
printf(" Please enter the student's name : ");
scanf("%s",&stu[i].name);
printf(" Please enter the age of the student : ");
scanf("%d",&stu[i].age);
printf(" Please enter the gender of the student : ");
scanf("%s",&stu[i].gender);
printf(" Please enter the date of birth of the student : ");
scanf("%s",&stu[i].birthday);
printf(" Please enter the student's address : ");
scanf("%s",&stu[i].site);
printf(" Please enter the student's phone number : ");
scanf("%d",&stu[i].sum);
printf(" Please enter the student's email : ");
scanf("%s",&stu[i].mail);
printf("\n");
}
n=n+a; // Now the number of people in the system
} Browse student information
Use browse function ：
void browse() // Browse student information
{
if(n==0) // When n by 0 Give a hint when ： No information
{
printf(" There is currently no student information \n");
return;
}
printf(" Student number full name Age Gender date of birth Address Phone number email \n");
for(int i=0;i<=n;i++)
{
printf("%s %s %d %s %s %s %d %s", stu[i].sumber, stu[i].name, stu[i].age, stu[i].gender, stu[i].birthday, stu[i].site, stu[i].sum, stu[i].mail);
}
system("pause");
}If n=0 Will give a prompt without information ;
Search for student information
Here I use the student ID to search ：
void inquire() // Search for student information
{
char num[10];
printf(" Please enter your student number ：");
scanf("%s",&num);
int i;
for(i=0;i<n;i++)
{
if(strcmp(stu[i].sumber, num) == 0) // Traverse and query personal information
{
printf(" Student number full name Age Gender date of birth Address Phone number email ");
printf("%s %s %d %s %s %s %d %s", stu[i].sumber, stu[i].name, stu[i].age, stu[i].gender, stu[i].birthday, stu[i].site, stu[i].sum, stu[i].mail);
break;
}
}
if(i==n)
printf(" Check no one \n");
}
Save information
void save(){
int i;
FILE *fp;
char filename[16];
printf(" Please enter a file name to save ：\n");
scanf("%s", filename);
fp = fopen(filename, "w");
for (i = 0; i < n; i++){
fprintf(fp, "%s%s%d%s%s%s%d%s\n", stu[i].sumber, stu[i].name, stu[i].age, stu[i].gender,
stu[i].birthday, stu[i].site, stu[i].sum, stu[i].mail);
}
printf(" Saved successfully ！！！\n");
fclose(fp);
system("pause");
}I don't quite understand this part , If you know something, you can discuss it together .
Delete the information
Use student ID to search , Delete the student number , And move the back position forward .
void del() // Delete
{
int i, j, flag;
char s1[10];
printf(" Please enter the student number to be deleted ：\n");
scanf("%s", s1);
flag = 0;
for (i = 0; i < n; i++)
{
if (strcmp(s1, stu[i].sumber) == 0)
{
flag = 1;
for (j = i; j < n - 1; j++)
{
stu[j] = stu[j + 1];// Just move all the students in the back one
}
}
if (flag == 1) break;// Indicates that the student to be deleted has been found , End of cycle
}
if (0 == flag)
{
printf(" The student number does not exist ！！！\n");
}
if (1 == flag)
{
printf(" Delete successful \n");
n--;
}
system("pause");Modify the information
Use the submenu to modify the information of the target .
void remove() // modify
{
int i,g;
char name[15],number[9],sex,birthday,site,mail;
int age,sum;
printf(" Please enter the name of the student to be modified : \n");
getchar();
gets(name);
while(1)
{
g=0;
for(i=0;i<n;i++)
{
int num1;
if(strcmp(name,stu[i].name)==0) // Traverse to find information , Create submenu
{
g=1;
printf(" ---------- 1. Change the student number ----------\n");
printf(" ---------- 2. Change the name ----------\n");
printf(" ---------- 3. Change the age ----------\n");
printf(" ---------- 4. Change gender ----------\n");
printf(" ----------5. Modify phone number ----------\n");
printf(" ----------6. Modify the date of birth ----------\n");
printf(" ---------- 7. Change address ----------\n");
printf(" ---------- 8. Modify email ----------\n");
printf(" ---------- 9. Exit the submenu ----------\n");
printf(" Please enter the service of the submenu ：");
scanf("%d",&num1);
switch(num1) // Change information
{
case 1:
printf(" Please enter a new student number ：");
getchar();
gets(number);
strcpy(stu[i].sumber,number);
break;
case 2:
printf(" Please enter a new name ：");
getchar();
gets(name);
strcpy(stu[i].name,name);
break;
case 3:
printf(" Please enter a new age ：");
scanf("%d",&age);
stu[i].age=age;
break;
case 4:
printf(" Please enter a new gender ：");
scanf("%d",&sex);
stu[i].gender=sex;
break;
case 5:
printf(" Please enter a new phone number ：");
scanf("%d",&sum);
stu[i].sum=sum;
break;
case 6:
printf(" Please enter a new date of birth ：");
scanf("%s",&birthday);
stu[i].birthday=birthday;
break;
case 7:
printf(" Please enter a new address ：");
scanf("%d",&site);
stu[i].site=site;
break;
case 8:
printf(" Please enter a new mailbox ：");
scanf("%d",&mail);
stu[i].mail=mail;
break;
case 9:
return;
break;
default:
printf(" Please be there. 1--9 Choose between ！\n");
}
}
}
if(g==0)
printf(" Check no one ");
}
} choice
utilize switch Statement to jump to the function used , It is similar to the function of selecting submenu in modification .
void choose(int i)
{
switch(i){
case 1:entering();break;
case 2:inquire();break;
case 3:browse();break;
case 4:remove();break;
case 5:save();break;
case 6:del();break;
case 0:return;break;
default :printf(" Incorrect input ");
}
}Here are all the codes of the management system ：
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define N 30
int n=0; // Create global variables to control the number of people entered
struct student{ // Defining structure
char sumber[10]; // Student number
char name[15]; // full name
int age; // Age
char gender; // Gender
char birthday; // date of birth
char site; // Address
int sum; // Phone number
char mail; // email
}stu[N];
// Defined function
int entering() // Enter student information
{
int a;
printf(" Please enter the number of students to add ：");
scanf("%d",&a);
int i;
for(i=n;i<a+n;i++) // Add to the existing number
{
printf(" Please enter the student number : ");
scanf("%s", stu[i].sumber);
printf(" Please enter the student's name : ");
scanf("%s",&stu[i].name);
printf(" Please enter the age of the student : ");
scanf("%d",&stu[i].age);
printf(" Please enter the gender of the student : ");
scanf("%s",&stu[i].gender);
printf(" Please enter the date of birth of the student : ");
scanf("%s",&stu[i].birthday);
printf(" Please enter the student's address : ");
scanf("%s",&stu[i].site);
printf(" Please enter the student's phone number : ");
scanf("%d",&stu[i].sum);
printf(" Please enter the student's email : ");
scanf("%s",&stu[i].mail);
printf("\n");
}
n=n+a; // Now the number of people in the system
}
void browse() // Browse student information
{
if(n==0) // When n by 0 Give a hint when , No information
{
printf(" There is currently no student information \n");
return;
}
printf(" Student number full name Age Gender date of birth Address Phone number email \n");
for(int i=0;i<=n;i++)
{
printf("%s %s %d %s %s %s %d %s", stu[i].sumber, stu[i].name, stu[i].age, stu[i].gender, stu[i].birthday, stu[i].site, stu[i].sum, stu[i].mail);
}
system("pause");
}
void inquire() // Search for student information
{
char num[10];
printf(" Please enter your student number ：");
scanf("%s",&num);
int i;
for(i=0;i<n;i++)
{
if(strcmp(stu[i].sumber, num) == 0) // Traverse and query personal information
{
printf(" Student number full name Age Gender date of birth Address Phone number email ");
printf("%s %s %d %s %s %s %d %s", stu[i].sumber, stu[i].name, stu[i].age, stu[i].gender, stu[i].birthday, stu[i].site, stu[i].sum, stu[i].mail);
break;
}
}
if(i==n)
printf(" Check no one \n");
}
void save(){
int i;
FILE *fp;
char filename[16];
printf(" Please enter a file name to save ：\n");
scanf("%s", filename);
fp = fopen(filename, "w");
for (i = 0; i < n; i++){
fprintf(fp, "%s%s%d%s%s%s%d%s\n", stu[i].sumber, stu[i].name, stu[i].age, stu[i].gender,
stu[i].birthday, stu[i].site, stu[i].sum, stu[i].mail);
}
printf(" Saved successfully ！！！\n");
fclose(fp);
system("pause");
}
void del() // Delete
{
int i, j, flag;
char s1[10];
printf(" Please enter the student number to be deleted ：\n");
scanf("%s", s1);
flag = 0;
for (i = 0; i < n; i++)
{
if (strcmp(s1, stu[i].sumber) == 0)
{
flag = 1;
for (j = i; j < n - 1; j++)
{
stu[j] = stu[j + 1];// Just move all the students in the back one
}
}
if (flag == 1) break;// Indicates that the student to be deleted has been found , End of cycle
}
if (0 == flag)
{
printf(" The student number does not exist ！！！\n");
}
if (1 == flag)
{
printf(" Delete successful \n");
n--;
}
system("pause");
}
void remove() // modify
{
int i,g;
char name[15],number[9],sex,birthday,site,mail;
int age,sum;
printf(" Please enter the name of the student to be modified : \n");
getchar();
gets(name);
while(1)
{
g=0;
for(i=0;i<n;i++)
{
int num1;
if(strcmp(name,stu[i].name)==0) // Traverse to find information , Create submenu
{
g=1;
printf(" ---------- 1. Change the student number ----------\n");
printf(" ---------- 2. Change the name ----------\n");
printf(" ---------- 3. Change the age ----------\n");
printf(" ---------- 4. Change gender ----------\n");
printf(" ----------5. Modify phone number ----------\n");
printf(" ----------6. Modify the date of birth ----------\n");
printf(" ---------- 7. Change address ----------\n");
printf(" ---------- 8. Modify email ----------\n");
printf(" ---------- 9. Exit the submenu ----------\n");
printf(" Please enter the service of the submenu ：");
scanf("%d",&num1);
switch(num1) // Change information
{
case 1:
printf(" Please enter a new student number ：");
getchar();
gets(number);
strcpy(stu[i].sumber,number);
break;
case 2:
printf(" Please enter a new name ：");
getchar();
gets(name);
strcpy(stu[i].name,name);
break;
case 3:
printf(" Please enter a new age ：");
scanf("%d",&age);
stu[i].age=age;
break;
case 4:
printf(" Please enter a new gender ：");
scanf("%d",&sex);
stu[i].gender=sex;
break;
case 5:
printf(" Please enter a new phone number ：");
scanf("%d",&sum);
stu[i].sum=sum;
break;
case 6:
printf(" Please enter a new date of birth ：");
scanf("%s",&birthday);
stu[i].birthday=birthday;
break;
case 7:
printf(" Please enter a new address ：");
scanf("%d",&site);
stu[i].site=site;
break;
case 8:
printf(" Please enter a new mailbox ：");
scanf("%d",&mail);
stu[i].mail=mail;
break;
case 9:
return;
break;
default:
printf(" Please be there. 1--9 Choose between ！\n");
}
}
}
if(g==0)
printf(" Check no one ");
}
}
void show() // Show menu
{
printf(" ----------1. Enter student information ----------\n");
printf(" ----------2. Search for student information ----------\n");
printf(" ----------3. Browse student information ----------\n");
printf(" ----------4. Modify student information ----------\n");
printf(" ----------5. Save student information ----------\n");
printf(" ----------6. Delete student information ----------\n");
printf(" --------------0. sign out --------------\n");
}
void choose(int i)
{
switch(i){
case 1:entering();break;
case 2:inquire();break;
case 3:browse();break;
case 4:remove();break;
case 5:save();break;
case 6:del();break;
case 0:return;break;
default :printf(" Incorrect input ");
}
}
int main()
{
int a;
show();
do{
printf("\n Please enter the service you want to select : ");
scanf("%d",&a);
choose(a);
}while(a);
return 0;
} You are welcome to correct anything wrong .
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