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student.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_NAME 50
+#define MAX_NUM  50
+
+typedef struct
+{
+    char name[MAX_NAME];
+    char surname[MAX_NAME];
+    char number[MAX_NUM];
+} Student;
+
+void insertStudent(Student *student)
+{
+    char number[MAX_NUM];
+    int flag = 0;
+    printf("Enter name: ");
+    scanf("%s", student->name);
+    printf("Enter surname: ");
+    scanf("%s", student->surname);
+    
+    do {
+        printf("Enter number: ");
+        scanf("%s", student->number);
+        flag = 0;
+        
+        FILE *fp = fopen("ogrenci.txt", "r");
+        char name[MAX_NAME], surname[MAX_NAME], num[MAX_NUM];
+        while (fscanf(fp, "%s %s %s", name, surname, num) != EOF)
+        {
+            if (strcmp(student->number, num) == 0)
+            {
+                printf("Farkli id Giriniz..\n");
+                flag = 1;
+                break;
+            }
+        }
+        fclose(fp);
+    } while (flag);
+    
+    FILE *fp = fopen("ogrenci.txt", "a");
+    fprintf(fp, "%s %s %s ", student->name, student->surname, student->number);
+    fclose(fp);
+}
+
+
+void updateStudent(char *number, Student *student)  //dosyadaki veriyi gncelleme
+{
+    FILE *fp = fopen("ogrenci.txt", "r");
+    FILE *fp2 = fopen("ogrenci2.txt", "w");
+    char name[MAX_NAME];
+    char surname[MAX_NAME];
+    char num[MAX_NUM];
+    int flag = 0;
+    while (fscanf(fp, "%s %s %s", name, surname, num) != EOF)
+    {
+        if (strcmp(num, number) == 0)  
+        {
+            printf("Enter name: ");
+            scanf("%s", student->name);
+            printf("Enter surname: ");
+            scanf("%s", student->surname);
+            fprintf(fp2, "%s %s %s ", student->name, student->surname, num);
+            flag = 1;
+        }
+        else
+        {
+            fprintf(fp2, "%s %s %s ", name, surname, num);
+        }
+    }
+    fclose(fp);
+    fclose(fp2);
+    remove("ogrenci.txt");
+    rename("ogrenci2.txt", "ogrenci.txt");
+    if (flag == 0)
+    {
+        printf("No student");
+    }
+}
+
+
+void deleteStudent(char *number)  //dosyadaki veriyi silme
+{
+    FILE *fp = fopen("ogrenci.txt", "r");
+    FILE *fp2 = fopen("ogrenci2.txt", "w");
+    char name[MAX_NAME];
+    char surname[MAX_NAME];
+    char num[MAX_NUM];
+    while (fscanf(fp, "%s %s %s", name, surname, num) != EOF)
+    {
+        if (strcmp(num, number) != 0)
+        {
+            fprintf(fp2, "%s %s %s ", name, surname, num);
+        }
+    }
+    fclose(fp);
+    fclose(fp2);
+    remove("ogrenci.txt");
+    rename("ogrenci2.txt", "ogrenci.txt");
+}
+
+void listStudents()  //dosyadaki verileri listeleme
+{
+    FILE *fp = fopen("ogrenci.txt", "r");
+    char name[MAX_NAME];
+    char surname[MAX_NAME];
+    char number[MAX_NUM];
+    while (fscanf(fp, "%s %s %s", name, surname, number) != EOF)
+    {
+        printf("%s %s %s \n", name, surname, number);
+    }
+    fclose(fp);
+}
+
+int main()
+{
+	
+    Student * student; // bir struct oluturuluyor.
+    student = (Student *)malloc(sizeof(Student));   //Struct iin sistemden bellek alnyor
+    if(!student){
+    	printf("bellek hatas");
+    	return 1;
+	}
+    char number[MAX_NUM];
+    int sec;
+    while (1)
+    {
+        printf("\n1-Insert Student 2-Update Student 3-Delete Student 4-List Students 5-Exit\n");
+        scanf("%d", &sec);
+        switch (sec)
+        {
+        case 1:
+            insertStudent(&student);
+            break;
+        case 2:
+            printf("Enter number: ");
+            scanf("%s", number);
+            updateStudent(number, &student);
+            break;
+        case 3:
+            printf("Enter number: ");
+            scanf("%s", number);
+            deleteStudent(number);
+            break;
+        case 4:
+            listStudents();
+            break;
+        case 5:
+            exit(0);
+            break;
+        default:
+            printf("Wrong choice");
+        }
+    }
+    return 0;
+}