is

Entry.c

@@ -0,0 +1,103 @@
+#include<stdio.h>
+#include<time.h>
+#include<stdlib.h>
+#include<string.h>
+#include"check.h"
+					//Entry file to register the entry time of a student
+struct myst2{
+char id[15];
+time_t t;
+}st1,st2;
+
+struct myst3{
+char id[15];
+int checker;
+}st3;
+
+struct myst4{
+char id[15];
+}st4;
+
+void Entrytime(void){
+
+    int k=0;				//flag to check if student is registered or not
+    char b[15];
+    char c[15];
+    FILE *En,*ch,*wa;
+    ch = fopen("status","ab+");
+
+    if(ch==NULL){
+        printf("Cannot open Entry file");
+        exit(0);
+    }
+
+    printf("  Enter the student ID number: ");
+    scanf("%s",c);
+    strcpy(st1.id,c);
+
+    if (check(c)==1){
+    while(fread(&st3,sizeof(struct myst3),1,ch))
+    {
+       if (strcmp(st3.id,st1.id)==0){
+             k=st3.checker;
+        }
+    }
+    fclose(ch);
+
+    if (k==1){
+    En = fopen("Entry","ab+");
+    ch = fopen("status","ab+");
+    while(fread(&st3,sizeof(struct myst3),1,ch))
+    {
+       if (strcmp(st3.id,st1.id)==0){
+             st3.checker=0;
+             fwrite(&st3,sizeof(struct myst3),1,ch);
+       }
+    }
+    st1.t = time(NULL);
+    fwrite(&st1,sizeof(struct myst2),1,En);
+    fclose(En);fclose(ch);
+    }
+
+    else {
+                 En = fopen("Entry","ab+");
+                 ch = fopen("status","ab+");
+                 printf("  Warning previous entry time not registered\n");
+                 printf("  Do you want to continue (Y/N)?: ");
+                 scanf("%s",b);
+                 if (strcmp(b,"Y") == 0)
+                 {
+                  wa = fopen("warnings","ab+");
+                  strcpy(st4.id,c);
+                  fwrite(&st4,sizeof(struct myst4),1,wa);
+                  fclose(wa);
+                  strcpy(st2.id,c);
+                  st2.t=time(NULL);
+                  if(En==NULL){
+                     printf("\tCannot open the Entry file\n");
+                     exit(0);
+                 }
+                while(fread(&st3,sizeof(struct myst3),1,ch))
+                {
+                   if (strcmp(st3.id,st1.id)==0){
+                       st3.checker=0;
+                       fwrite(&st3,sizeof(struct myst3),1,ch);
+                   }
+                }
+                fwrite(&st2, sizeof(struct myst2),1,En);
+                }
+                else if (strcmp(b,"N") == 0){
+                printf("  Entry time not registered\n");
+                }
+                else
+                {
+                      printf("  Unrecognised command\n");
+                } 
+    fclose(En);fclose(ch);
+   }
+}
+
+   else if (check(c)==0){
+       printf("  %s not registered\n",c);
+   }
+}

Entry.h

@@ -0,0 +1 @@
+void Entrytime(void);

Exit.c

@@ -0,0 +1,98 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<time.h>
+#include<string.h>
+#include"check.h"
+					//file to register the exit of a student
+struct myst2{
+char id[15];
+time_t t;
+}st1,st2;
+
+struct myst3{
+char id[15];
+int checker;
+}st3;
+
+struct myst4{
+char id[15];
+}st4;
+
+void Exittime(void){
+    int k=1;
+    char b[15];
+    char c[15];
+    FILE *Ex,*ch,*wa;
+    ch = fopen("status","ab+");
+    if(ch==NULL){
+        printf("Cannot open Exit file");
+        exit(0);
+    }
+
+    printf("  Enter the student ID number: ");
+    scanf("%s",c);
+    strcpy(st1.id,c);							//copy the entered roll number into the structure 	
+    if (check(c)==1){
+    while(fread(&st3,sizeof(struct myst3),1,ch))		
+    {
+       if (strcmp(st3.id,st1.id)==0){
+             k=st3.checker;
+       }
+    }
+    fclose(ch);
+
+    if (k==0){
+    Ex = fopen("Exit","ab+");
+    ch = fopen("status","ab+");
+    while(fread(&st3,sizeof(struct myst3),1,ch))			//register exit if student is in the database
+    {
+       if (strcmp(st3.id,st1.id)==0){
+             st3.checker=1;
+             fwrite(&st3,sizeof(struct myst3),1,ch);
+       }
+    }
+    st1.t = time(NULL);
+    fwrite(&st1,sizeof(struct myst2),1,Ex);
+    fclose(ch);fclose(Ex);
+    }
+    else {
+                 Ex = fopen("Exit","ab+");
+                 ch = fopen("status","ab+");
+                 printf("  Warning previous entry time not registered\n");		//warning if student did not make an entry before exit
+                 printf("  Do you want to continue (Y/N)? : ");				//by default all registered students are considered in the campus
+                 scanf("%s",b);
+                 if (strcmp(b,"Y")==0)
+                 {
+                  wa = fopen("warnings","ab+");
+                  strcpy(st4.id,c);
+                  fwrite(&st4,sizeof(struct myst4),1,wa);
+                  fclose(wa);
+                  strcpy(st2.id,c);
+                  st2.t=time(NULL);
+                  if(Ex==NULL){
+                     printf("\tCannot open the Entry file\n");
+                     exit(0);
+                 }
+                while(fread(&st3,sizeof(struct myst3),1,ch))
+                {
+                   if (strcmp(st3.id,st1.id)==0){
+                       st3.checker=1;
+                       fwrite(&st3,sizeof(struct myst3),1,ch);
+                   }
+                }
+                fwrite(&st2, sizeof(struct myst2),1,Ex);
+                }
+                else if (strcmp(b,"N")==0){
+                printf("  Exit time not registered\n");
+                }
+                else
+                {
+                      printf("  Unrecognised command\n");				//in case of unnecessary commands
+                } 
+    fclose(Ex);
+    fclose(ch);
+     }
+}
+     else if(check(c)==0){
+        printf("  student not registered\n");}
+}

Exit.h

@@ -0,0 +1 @@
+void Exittime(void);

Makefile

@@ -0,0 +1,28 @@
+#-*-Makefile-*
+
+main: main.o add_student.o Entry.o Exit.o Student_status.o stu_info.o Student_history.o Student_list.o check.o warnings.o display.o
+	gcc main.o add_student.o Entry.o Exit.o Student_status.o stu_info.o  Student_history.o Student_list.o check.o warnings.o display.o -o main
+main.o: main.c add_student.h Entry.h Exit.h Student_status.h stu_info.h Student_history.h Student_list.h check.h warnings.h display.h
+	gcc -c main.c
+add_student.o: add_student.c
+	gcc -c add_student.c
+Entry.o: Entry.c
+	gcc -c Entry.c
+Exit.o: Exit.c
+	gcc -c Exit.c
+Student_status.o: Student_status.c
+	gcc -c Student_status.c
+stu_info.o: stu_info.c
+	gcc -c stu_info.c
+Student_list.o: Student_list.c
+	gcc -c Student_list.c
+Student_history.o: Student_history.c
+	gcc -c Student_history.c
+check.o: check.c
+	gcc -c check.c
+warnings.o: warnings.c
+	gcc -c warnings.c
+display.o: display.c
+	gcc -c display.c
+clean:
+	rm *.o main

Student_history.c

@@ -0,0 +1,84 @@
+#include<stdio.h>
+#include<string.h>
+#include<time.h>
+#include<stdlib.h>
+
+struct myst1{
+char id[15];
+char name[15];
+}temp;
+
+struct myst2{
+char id[15];
+time_t t;
+}temp1,temp2;
+
+void studenthistory(void)
+{       char c[15];
+        struct tm *ptr;
+        FILE *p1,*p2,*p3;
+        int enh=0,enm=0,ens=0,exh=0,exm=0,exs=0,his=0;
+        printf("  Enter the roll number: ");
+        scanf("%s",c);
+        p1 = fopen("student","rb+");
+        if(p1==NULL){
+            printf("\tCannot open the student file\n");
+            exit(0);
+        }
+        p2 = fopen("Entry","ab+");
+        if(p2==NULL){
+            printf("\tCannot open the student file\n");
+        }
+        p3 = fopen("Exit","ab+");
+        if(p3==NULL){
+            printf("\tCannot open the student file\n");
+        }
+        while(fread(&temp,sizeof(struct myst1),1,p1)){
+            if(strcmp(temp.id,c)==0){
+                printf("  Student name : %s\n",temp.name);
+                break;}}
+                printf("  Entry time list\n");
+                his=0;
+
+        while(fread(&temp1,sizeof(struct myst2),1,p2)){  
+                    if(strcmp(c,temp1.id)==0){
+			his=1;
+                        ptr = localtime(&temp1.t);
+                        printf("     Entry Time is: ");					//print entry time 
+                        printf("%dHrs ", ptr->tm_hour);
+                        printf("%dMnts ", ptr->tm_min);
+                        printf("%dSecs \n", ptr->tm_sec);
+                        enh =  ptr->tm_hour;enm =  ptr->tm_min;ens = ptr->tm_sec;                  
+                     }
+                }
+
+        if (his == 0){
+                       printf("     No History Available\n");
+                }
+
+        else{
+              printf("  Latest entry time registered: %dHrs %dMnts %dSecs \n",enh,enm,ens);
+            }
+        printf("  Exit time list\n");
+        his=0;
+
+        while(fread(&temp2,sizeof(struct myst2),1,p3)){            
+                            if(strcmp(c,temp2.id)==0){
+				his=1;
+                                ptr = localtime(&temp2.t);
+                                printf("     Exit  Time is: ");
+                                printf("%dHrs ", ptr->tm_hour);
+                                printf("%dMnts ", ptr->tm_min);
+                                printf("%dSecs \n", ptr->tm_sec);
+                                exh =  ptr->tm_hour;exm= ptr->tm_min;exs= ptr->tm_sec;
+
+                    } 
+                }
+
+       if (his == 0){
+                 printf("     No History Available\n");
+        }
+       else{
+            printf("  Latest exit time registered: %dHrs %dMnts %dSecs \n",exh,exm,exs); }
+         fclose(p1);fclose(p2);fclose(p3);
+}

Student_history.h

@@ -0,0 +1 @@
+void studenthistory(void);

Student_list.c

@@ -0,0 +1,17 @@
+#include<stdio.h>
+#include<stdlib.h>
+struct myst1{
+char id[15];
+char name[15];
+}st1;
+void studentlist(void){
+     FILE *p1;
+     p1 = fopen("student","r");
+     if(p1==NULL){
+           printf("cannot open student file");
+           exit(0);
+     }
+														//prints the list of registered students from students database				
+     while(fread(&st1,sizeof(struct myst1),1,p1)) printf("  Student ID : %s Student name : %s\n",st1.id,st1.name);
+     fclose(p1);
+}   

Student_list.h

@@ -0,0 +1 @@
+void studentlist(void);

Student_status.c

@@ -0,0 +1,52 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<string.h>
+#include<time.h>
+#include"check.h"
+
+struct myst3{
+char id[15];
+int checker;
+}st3;
+
+struct myst1{
+char id[15];
+char name[15];
+}st1;
+
+void Student_status(void){
+      int k;
+      char c[15],b[15];
+      FILE *p1,*p2;
+      printf("  Enter the student ID number:");
+      scanf("%s",c);
+      if(check(c)==1){						//flag to check if student is registered or not 
+      p2 = fopen("student","r");
+      p1 = fopen("status","r");
+
+      while(fread(&st1,sizeof(struct myst1),1,p2)){		//look for the registered  name in registered student database 
+            if (strcmp(st1.id,c)==0){
+                strcpy(b,st1.name);break;}}
+      while(fread(&st3,sizeof(struct myst3),1,p1)){
+          if(strcmp(st3.id,c)==0){
+             k = st3.checker;
+          }
+      }
+
+      if (k==1)
+      {
+           printf("  %s is not in the campus\n",b);
+      }
+
+      else if(k==0)
+      {
+           printf("  %s is in the campus\n",b);
+      }
+
+      fclose(p1);fclose(p2);
+      }
+
+      else if (check(c)==0){
+          printf("  Student not registered\n");
+      }
+}

Student_status.h

@@ -0,0 +1 @@
+void Student_status(void);