C language simple student management system (including source code)

  Project screenshots ：

Here is the complete source code ;

cpp file ：

#include "StudentManagerSystem.h"

int main() {
	// Change console font color 	
	SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN);
	int num;
	while (1) {
		welcome();
		scanf("%d", &num);
		switch (num) {
		case 1:	// Enter student information 
			InputStudent();
			break;
		case 2:	// Print student information 
			PrintStudent();
			break;
		case 3:	// Save student information 
			SaveStudent();
			break;
		case 4:	// Read student information 
			ReadStudent();
			break;
		case 5:	// Count the number of all students 
			CountStudent();
			break;
		case 6:	// Search for student information 
			FindStudent();
			break;
		case 7:	// Modify student information 
			ModifyStudent();
			break;
		case 8:	// Delete student information 
			DeleteStudent();
			break;
		case 9:	// Exit the system 
			return 0;
		}
	}

	return 0;
}

The header file ：

#pragma once
#include<bits/stdc++.h>
#include <windows.h>
using namespace std;

// Clear the screen after each operation 
void cleanScreen() {
	system("pause");   // Pause 
	system("cls");		// Clear the screen 
}

// The welcome screen 
void welcome() {
	printf("*************************************************\n");
	printf("\t\t Welcome to student management system \t\t\t\n");
	printf("*************************************************\n");
	printf("*\t\t Please select the function list \t\t\t*\n");
	printf("*************************************************\n");
	printf("*\t\t1. Enter student information \t\t\t*\n");
	printf("*\t\t2. Print student information \t\t\t*\n");
	printf("*\t\t3. Save student information \t\t\t*\n");
	printf("*\t\t4. Read student information \t\t\t*\n");
	printf("*\t\t5. Count the number of all students \t\t*\n");
	printf("*\t\t6. Search for student information \t\t\t*\n");
	printf("*\t\t7. Modify student information \t\t\t*\n");
	printf("*\t\t8. Delete student information \t\t\t*\n");
	printf("*\t\t9. Exit the system \t\t\t*\n");
	printf("\n");
}

typedef struct student {
	char name[30];	// name 
	int age;	// Age 
	long long stuNum;  // Student number 
	int score;	// fraction 
}Student;

typedef struct _Node {
	Student stu;
	struct _Node* pNext;
}Node;

Node* g_pHead = NULL;   // Initialization header pointer 

// Enter student information 
void InputStudent() {
	Node* pNewNode = (Node*)malloc(sizeof(Node)); // Note that this is (sizeof(Node)), instead of sizeof(Node*)!!!
	pNewNode->pNext = NULL;

	// The first interpolation 
	if (g_pHead == NULL) {
		g_pHead = pNewNode;
	}
	else {
		pNewNode->pNext = g_pHead;
		g_pHead = pNewNode;
	}

	// input data 
	printf(" Please enter student information ：\n");
	printf(" Enter a name ：\n");
	scanf("%s", pNewNode->stu.name);
	printf(" Enter the age ：\n");
	scanf("%d", &pNewNode->stu.age);
	printf(" Enter the student id ：\n");
	scanf("%lld", &pNewNode->stu.stuNum);
	printf(" Enter the score ：\n");
	scanf("%d", &pNewNode->stu.score);
	printf(" Student information entered successfully ！\n");
	cleanScreen();
}

// Output student information 
void PrintStudent() {
	Node* p = g_pHead;
	printf("*************************************************\n");
	printf(" Student number \t\t full name \t\t Age \t\t fraction \n");
	while (p != NULL) {  
		printf("%-16lld", p->stu.stuNum);
		printf("%-16s", p->stu.name);
		printf("%-16d", p->stu.age);
		printf("%-16d\n", p->stu.score);
		p = p->pNext;  
	}
	cleanScreen();
}

// Save student information 
void SaveStudent() {
	// Open file 
	FILE* fp = fopen("C:\\Users\\14185\\Desktop\\stuinfo.dat", "w");
	if (fp == NULL) {
		printf(" File opening failure \n");
		return;
	}
	// Write data to file ( Traversing the linked list )
	Node* p = g_pHead;
	while (p != NULL) {
		fwrite(&p->stu, 1, sizeof(Student), fp);
		p = p->pNext;
	}

	// Close file 
	fclose(fp);
	printf(" Data saved successfully ！\n");
	cleanScreen();
}

// Read the data in the file 
void ReadStudent() {
	FILE* fp = fopen("C:\\Users\\14185\\Desktop\\stuinfo.dat", "r");
	if (fp == NULL) {
		printf(" Failed to read file ！\n");
		return;
	}
	Student stu;
	while (fread(&stu, 1, sizeof(Student), fp)) {
		Node* pNewNode = (Node*)malloc(sizeof(Node));
		pNewNode->pNext = NULL;

		memcpy(pNewNode, &stu, sizeof(Student));

		if (g_pHead == NULL) {
			g_pHead = pNewNode;
		}
		else {
			pNewNode->pNext = g_pHead;
			g_pHead = pNewNode;
		}
		fclose(fp);
		printf(" File read successful ！\n");
		cleanScreen();
	}
}
// Count the number of all students 
void CountStudent() {
	int cnt = 0;
	Node* p = g_pHead;
	while (p != NULL) {
		++cnt;
		p = p->pNext;
	}
	printf(" The total number of students is ：%d\n", cnt);
	cleanScreen();
}

// Find students 
void FindStudent() {
	long long stuNum;   // Student number 
	printf(" Please enter the student number you want to find ：\n");
	scanf("%lld", &stuNum);
	Node* p = g_pHead;
	while (p != NULL) {
		if (p->stu.stuNum == stuNum) {
			printf(" Student number ：%lld   full name ：%s   Age ：%d   fraction ：%d\n",p->stu.stuNum, p->stu.name, p->stu.age, p->stu.score);
			cleanScreen();
			return;
		}
		p = p->pNext;
	}
	printf(" No relevant student information was found .\n");
	cleanScreen();
}

// Modify student information 
void ModifyStudent() {
	printf(" Please enter the student number that needs to modify the student information ：\n");
	long long stuNum;
	scanf("%lld", &stuNum);
	Node* p = g_pHead;
	while (p != NULL) {
		if (p->stu.stuNum == stuNum) {
			printf(" Please input the modified information ( Student number / full name / Age / fraction ):\n");
			scanf("%lld %s %d %d", &p->stu.stuNum, p->stu.name, &p->stu.age, &p->stu.score);
			cleanScreen();
			return;
		}
		p = p->pNext;
	}
	printf(" No student information found .\n");
	cleanScreen();
}

// Delete student information 
void DeleteStudent() {
	printf(" Please enter the student number of the student information to be deleted ：\n");
	long long stuNum;
	scanf("%lld", &stuNum);
	Node* p1, *p2;    // Note that there p2 Plus an asterisk in front ！

	// If the linked list is empty at the beginning 
	if (g_pHead == NULL) {
		printf(" No student information found .\n");
		cleanScreen();
		return;
	}

	// If the point to be deleted happens to be the head node 
	if (g_pHead->stu.stuNum == stuNum) {
		p1 = g_pHead;
		g_pHead = g_pHead->pNext;
		free(p1);
		printf(" Delete successful ！\n");
		cleanScreen();
		return;
	}

	// The point to be deleted is in the middle 
	Node* p = g_pHead;
	while (p->pNext != NULL) {
		if (p->pNext->stu.stuNum == stuNum) {
			p2 = p->pNext;
			p->pNext = p->pNext->pNext;
			free(p2);
			printf(" Delete successful ！\n");
			cleanScreen();
			return;
		}
	}
	printf(" No student information found .\n");
	cleanScreen();
	return;
}