Primitive operations on Sequential file in C language

Primitive operations on Sequential file in C language

 
 #include  
 #include  
 #include  
 typedef struct stud  
 {  
 int roll;  
 char name[20];  
 struct add  
 {  
 int hno;  
 char city[10];  
 }add;  
 char clas[4];  
 int mark;  
 }stud;  
 stud alloc(stud );  
 void insert(char [20]);  
 void create();  
 void display();  
 void searchnr(char [20]);  
 void searchcr(char [20]);  
 void modify();  
 void delet();  
 void main()  
 {  
 int ch,ch1;  
 char filename[20];  
 do  
 {  
 clrscr();  
 printf("\n\t\tFILE OPERATION\n\t\t1.CREATE\n\t\t2.INSERT\n\t\t3.DISPLAY\n\t\t4.SEARCH\n\t\t5.MODIFY\n\t\t6.DELETE\n\t\t7.EXIT");  
 printf("\n\t\tENTER UR CHOICE");  
 scanf("%d",&ch);  
 switch(ch)  
 {  
 case 1:  
 printf("\n\t\tCREATE");  
 create();  
 break;  
 case 2:  
 printf("\n\t\tINSERT");  
 printf("\nENTER FILENAME:");  
 flushall();  
 gets(filename);  
 insert(filename);  
 break;  
 case 3:  
 printf("\n\t\tDISPLAY");  
 display();  
 break;  
 case 4:  
 printf("\nENTER FILENAME:");  
 flushall();  
 gets(filename);  
 do  
 {  
 clrscr();  
 printf("\n\t\tSEARCH\n\t\t1.BY NAME N ROLL NO\n\t\t2.BY ROLL NO N CLASS\n\t\t3.EXIT");  
 printf("\n\t\tENTER UR CHOICE");  
 scanf("%d",&ch1);  
 switch(ch1)  
 {  
 case 1:  
 printf("SEARCH BY NAME N ROLL NO");  
 searchnr(filename);  
 break;  
 case 2:  
 printf("SEARCH BY CLASS N ROLL NO");  
 searchcr(filename);  
 break;  
 case 3:  
 break;  
 }  
 }while(ch1!=3);  
 break;  
 case 5:  
 printf("\n\t\tMODIFY");  
 modify();  
 break;  
 case 6:  
 printf("\n\t\tDELETE");  
 delet();  
 break;  
 case 7:  
 break;  
 }  
 }while(ch!=7);  
 }  
 void create()  
 {  
 FILE *fp;  
 char filename[20];  
 printf("\nENTER THE FILE NAME:");  
 flushall();  
 gets(filename);  
 fp=fopen(filename,"r");  
 if(fp==NULL)  
 {  
 fclose(fp);  
 fopen(filename,"r");  
 }  
 else  
 {  
 printf("\nFILE IS ALREADY PRESENT,DO U WANT TO OVERWRITE PRESS 'y'");  
 if(getche()=='y')  
 {  
 fclose(fp);  
 fopen(filename,"w");  
 }  
 else  
 {  
 fclose(fp);  
 fopen(filename,"a");  
 }  
 }  
 fclose(fp);  
 do  
 {  
 insert(filename);  
 printf("DO U WANT TO CONTINUE:y/n");  
 }while(getche()=='y');  
 }  
 void insert(char filename[20])  
 {  
 FILE *fp;  
 char cl[10];  
 int i=0,r;  
 stud st,st1;  
 fp=fopen(filename,"r");  
 while(1)  
 {  
 printf("\nENTER ROLL NO:");  
 scanf("%d",&st.roll);  
 if(st.roll<0&&st.roll>60)  
 printf("\nINVALID ROLL NO");  
 else  
 break;  
 }  
 while(1)  
 {  
 printf("\nENTER CLASS:fe/se/te/be only");  
 scanf("%s",st.clas);  
 if(strcmp(st.clas,"fe")!=0&&strcmp(st.clas,"se")!=0&&strcmp(st.clas,"te")!=0&&strcmp(st.clas,"be")!=0)  
 printf("\nINVALID CLASS");  
 else  
 break;  
 }  
 if(fp==NULL)  
 {  
 printf("\nTHIS IS FIRST ENTRY IN THIS FILE");  
 }  
 else  
 while(!feof(fp))  
 {  
 fscanf(fp,"%d%d%d%s%s%s",&st1.roll,&st1.mark,&st1.add.hno,st1.add.city,st1.name,st1.clas);  
 if(st.roll==st1.roll&&(strcmp(st.clas,st1.clas))==0)  
 {  
 printf("\nALREADY PRESENT");  
 getch();  
 i++;  
 break;  
 }  
 }  
 fclose(fp);  
 fp=fopen(filename,"a");  
 if(i==0)  
 {  
 st=alloc(st);  
 fprintf(fp,"\n%d\n%d\n%d\n%s\n%s\n%s",st.roll,st.mark,st.add.hno,st.add.city,st.name,st.clas);  
 }  
 fclose(fp);  
 }  
 void display()  
 {  
 FILE *fp;  
 char filename[20];  
 int i=0;  
 stud st;  
 printf("\nENTER FILENAME:");  
 flushall();  
 gets(filename);  
 fp=fopen(filename,"r");  
 clrscr();  
 if(fp==NULL)  
 printf("\nFILE NOT FOUND");  
 else  
 while(!feof(fp))  
 {  
 fscanf(fp,"%d%d%d%s%s%s",&st.roll,&st.mark,&st.add.hno,st.add.city,st.name,st.clas);  
 printf("\nROLL NO:%d",st.roll);  
 printf("\nMARKS:%d",st.mark);  
 printf("\nHOUSE NO:%d",st.add.hno);  
 printf("\nCITY:%s",st.add.city);  
 printf("\nNAME:%s",st.name);  
 printf("\nCLASS:%s",st.clas);  
 i++;  
 getch();  
 if(i%2==0)  
 clrscr();  
 }  
 fclose(fp);  
 }  
 void searchnr(char filename[])  
 {  
 FILE *fp;  
 char nam[10];  
 int r,i=0;  
 stud st;  
 fp=fopen(filename,"r");  
 if(fp==NULL)  
 printf("\nFILE NOT FOUND");  
 else  
 {  
 printf("\nENTER ROLL NO:");  
 scanf("%d",&r);  
 printf("\nENTER NAME:");  
 scanf("%s",nam);  
 while(!feof(fp))  
 {  
 fscanf(fp,"%d%d%d%s%s%s",&st.roll,&st.mark,&st.add.hno,st.add.city,st.name,st.clas);  
 if(st.roll==r&&strcmp(st.name,nam)==0)  
 {  
 i=1;  
 printf("\nROLL NO:%d",st.roll);  
 printf("\nMARKS:%d",st.mark);  
 printf("\nHOUSE NO:%d",st.add.hno);  
 printf("\nCITY:%s",st.add.city);  
 printf("\nNAME:%s",st.name);  
 printf("\nCLASS:%s",st.clas);  
 getch();  
 }  
 }  
 }  
 if(i==0)  
 printf("\nNOT FOUND");  
 fclose(fp);  
 getch();  
 }  
 void searchcr(char filename[20])  
 {  
 FILE *fp;  
 char cl[10];  
 int r,i=0;  
 stud st;  
 fp=fopen(filename,"r");  
 if(fp==NULL)  
 printf("\nFILE NOT FOUND");  
 else  
 {  
 printf("\nENTER ROLL NO:");  
 scanf("%d",&r);  
 printf("\nENTER CLASS:");  
 scanf("%s",cl);  
 while(!feof(fp))  
 {  
 fscanf(fp,"%d%d%d%s%s%s",&st.roll,&st.mark,&st.add.hno,st.add.city,st.name,st.clas);  
 if(st.roll==r&&strcmp(st.clas,cl)==0)  
 {  
 i=1;  
 printf("\nROLL NO:%d",st.roll);  
 printf("\nMARKS:%d",st.mark);  
 printf("\nHOUSE NO:%d",st.add.hno);  
 printf("\nCITY:%s",st.add.city);  
 printf("\nNAME:%s",st.name);  
 printf("\nCLASS:%s",st.name);  
 getch();  
 break;  
 }  
 }  
 }  
 if(i==0)  
 printf("\nNOT FOUND");  
 fclose(fp);  
 getch();  
 }  
 void modify()  
 {  
 FILE *fp,*fp1;  
 char filename[20],filename1[20],cl[10];  
 int r,i=0,rol,ch;  
 stud st;  
 printf("\nENTER FILENAME:");  
 flushall();  
 gets(filename);  
 fp=fopen(filename,"r");  
 strcpy(filename1,"t");  
 strcat(filename1,filename);  
 fp1=fopen(filename1,"w");  
 if(fp==NULL)  
 printf("\nFILE NOT FOUND");  
 else  
 {  
 printf("\nENTER ROLL NO:");  
 scanf("%d",&rol);  
 printf("\nCLASS:");  
 scanf("%s",cl);  
 while(!feof(fp))  
 {  
 fscanf(fp,"%d%d%d%s%s%s",&st.roll,&st.mark,&st.add.hno,st.add.city,st.name,st.clas);  
 if(st.roll==rol&&strcmp(st.clas,cl)==0)  
 {  
 printf("\nOLD DAT IS:\nROLL NO:%d",st.roll);  
 printf("\nMARKS:%d",st.mark);  
 printf("\nHOUSE NO:%d",st.add.hno);  
 printf("\nCITY:%s",st.add.city);  
 printf("\nNAME:%s",st.name);  
 printf("\nCLASS:%s",st.clas);  
 getch();  
 do  
 {  
 clrscr();  
 printf("\nWHICH ENTRY U WANT TO MODIFY\n\t\t1.MARKS\n\t\t2.HOUSE NO\n\t\t3.CITY\n\t\t4.NAME\n\t\t5.EXIT");  
 printf("\nENTER UR CHOICE");  
 scanf("%d",&ch);  
 switch(ch)  
 {  
 case 1:  
 while(1)  
 {  
 printf("\nENTER NEW MARKS:");  
 scanf("%d",&st.mark);  
 if(st.mark<0&&st.mark>100)  
 printf("\nINVALID MARKS");  
 else  
 break;  
 getch();  
 }  
 break;  
 case 2:  
 while(1)  
 {  
 printf("\nENTER NEW HNO:");  
 scanf("%d",&st.add.hno);  
 if(st.add.hno<0&&st.add.hno>32000)  
 printf("\nINVALID h.NO");  
 else  
 break;  
 getch();  
 }  
 break;  
 case 3:  
 printf("\nENTER CITY:");  
 scanf("%s",st.add.city);  
 break;  
 case 4:  
 printf("\nENTER NAME:");  
 scanf("%s",st.name);  
 break;  
 case 5:  
 break;  
 }  
 }while(ch!=5);  
 i=1;  
 fprintf(fp1,"\n%d\n%d\n%d\n%s\n%s\n%s",st.roll,st.mark,st.add.hno,st.add.city,st.name,st.clas);  
 break;  
 }  
 else  
 fprintf(fp1,"\n%d\n%d\n%d\n%s\n%s\n%s",st.roll,st.mark,st.add.hno,st.add.city,st.name,st.clas);  
 }  
 }  
 while(!feof(fp))  
 {  
 fscanf(fp,"%d%d%d%s%s%s",&st.roll,&st.mark,&st.add.hno,st.add.city,st.name,st.clas);  
 fprintf(fp1,"\n%d\n%d\n%d\n%s\n%s\n%s",st.roll,st.mark,st.add.hno,st.add.city,st.name,st.clas);  
 }  
 fclose(fp);  
 fclose(fp1);  
 if(i==0)  
 {  
 printf("\nNOT FOUND");  
 remove(filename1);  
 }  
 else  
 {  
 remove(filename);  
 rename(filename1,filename);  
 }  
 getch();  
 }  
 void delet()  
 {  
 FILE *fp,*fp1;  
 char filename[20],cl[10],filename1[20];  
 int r,i=0;  
 stud st;  
 printf("\nENTER FILENAME:");  
 flushall();  
 gets(filename);  
 fp=fopen(filename,"r");  
 strcpy(filename1,"t");  
 strcat(filename1,filename);  
 fp1=fopen(filename1,"w");  
 if(fp==NULL)  
 printf("\nFILE NOT FOUND");  
 else  
 {  
 printf("\nENTER ROLL NO:");  
 scanf("%d",&r);  
 printf("\nENTER CLASS:");  
 scanf("%s",cl);  
 while(!feof(fp))  
 {  
 fscanf(fp,"%d%d%d%s%s%s",&st.roll,&st.mark,&st.add.hno,st.add.city,st.name,st.clas);  
 if(st.roll==r&&strcmp(st.clas,cl)==0)  
 {  
 i=1;  
 break;  
 }  
 else  
 fprintf(fp1,"\n%d\n%d\n%d\n%s\n%s\n%s",st.roll,st.mark,st.add.hno,st.add.city,st.name,st.clas);  
 }  
 }  
 while(!feof(fp))  
 {  
 fscanf(fp,"%d%d%d%s%s%s",&st.roll,&st.mark,&st.add.hno,st.add.city,st.name,st.clas);  
 fprintf(fp1,"\n%d\n%d\n%d\n%s\n%s\n%s",st.roll,st.mark,st.add.hno,st.add.city,st.name,st.clas);  
 }  
 fclose(fp);  
 fclose(fp1);  
 if(i==0)  
 {  
 printf("\nNOT FOUND");  
 remove("filename1");  
 }  
 else  
 {  
 remove(filename);  
 rename(filename1,filename);  
 printf("DATA IS DELETED");  
 }  
 getch();  
 }  
 stud alloc(stud st)  
 {  
 while(1)  
 {  
 printf("\nENTER MARKS:");  
 scanf("%d",&st.mark);  
 if(st.mark<0&&st.mark>100)  
 printf("\nINVALID ROLL NO");  
 else  
 break;  
 }  
 while(1)  
 {  
 printf("\nENTER HNO:");  
 scanf("%d",&st.add.hno);  
 if(st.add.hno<0&&st.add.hno>32000)  
 printf("\nINVALID ROLL NO");  
 else  
 break;  
 }  
 printf("\nENTER CITY:");  
 scanf("%s",st.add.city);  
 printf("\nENTER NAME:");  
 scanf("%s",st.name);  
 getch();  
 return st;  
 }