So I'm supposed to do this:
"For a group of students there is a given Name, Personal Identification Number (ex. 9209153460),grades from physics,math,programming. Create a program that contains information in a file and let's you choose the following:
-create an empty file.
-add information about students
-change information about a student by PIN
-extract/save text file of student's PIN, name and faculty number which have to show up on makeup exam(when you repeat exam)"
So far this is where I am, but can't quite figure out what to do? (Using DevC++)
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
struct LICE { //Type of information at hand
char ime[31]; char EGN[11];
};
FILE *fl;
char imefl[30];
LICE lice;
//wut
void readLice(LICE *lc){
printf("%20sType the name of: ","");
gets(lc->ime);
printf("%20sType EGN: ","");
gets(lc->EGN);
}
//wut
void writeLice(LICE lc){
printf("Name: %-21s EGN: %s\n",
lc.ime,lc.EGN);
}
int exist(char *ime){
FILE *f = fopen(ime,"r");fclose(f);
return f!=NULL;
}
//wut
void szdPrz(){
char ch;
if (exist(imefl)) {
printf("File Exists ");
printf("Should I overwrite?");
ch=getchar();
if (ch == 'n') return;
}
fl=fopen(imefl,"w");
fclose(fl);
printf("\n File created.\n");
}
//wut
void dobaviane(){
char ch;
if (!exist(imefl)) {
printf("File not created!\n");return;
}
fl=fopen(imefl,"a+b");
do{
readLice(&lice);
fwrite(&lice,sizeof(lice),1,fl);
printf("Will you continue writting? ");
ch=getchar();getchar();
}while (ch != 'n');
fclose(fl);
}
void iztrivane(){
FILE *delFl; //wut
char EGN[11]; //wut
if (!exist(imefl)) {
printf("Nope, file not created!\n");return;
}
printf("Type EGN: ");gets(EGN);
fl=fopen(imefl,"rb");delFl=fopen("Del","wb");
fread(&lice,sizeof(lice),1,fl);
while (!feof(fl)){
if (strcmp(lice.EGN,EGN)!=0)
fwrite(&lice,sizeof(lice),1,delFl);
else printf("Info EGN %s Deleted.\n",EGN);
fread(&lice,sizeof(lice),1,fl);
}
fclose(fl); fclose(delFl);
remove(imefl); rename("Del",imefl);
}
void zamiana(){
char EGN[11];// wut
if (!exist(imefl))
{ printf("File not created!\n");return; }
printf("Type EGN: ");gets(EGN);
fl=fopen(imefl,"r+b");
fread(&lice,sizeof(lice),1,fl);
while (!feof(fl)){
if (strcmp(lice.EGN,EGN)==0){
readLice(&lice);
fseek(fl,-(long)sizeof(lice),SEEK_CUR);
fwrite(&lice,sizeof(lice),1,fl);
printf("Info for EGN %s Saved.\n",EGN);
break;
}
fread(&lice,sizeof(lice),1,fl);
}
fclose(fl); printf("\n");
}
void spisGod(){
int k,godTrs,godLice;
char gg[3];
if (!exist(imefl))
{ printf("File not created!\n");return; }
printf("Type the birth year: ");
scanf("%d",&godTrs);getchar();
fl=fopen(imefl,"rb"); k=0;
fread(&lice,sizeof(lice),1,fl);
while (!feof(fl)){
strncpy(gg,lice.EGN,2); gg[2]=0; godLice=atoi(gg);
if (lice.EGN[2]>'3') godLice+=2000;
else godLice+=1900;
if (godLice==godTrs) {k++;writeLice(lice);}
fread(&lice,sizeof(lice),1,fl);
}
if (k==0)
printf("Nobody born in %d ã.\n",godTrs);
fclose(fl);
}
void obSpis(){
int k;
if (!exist(imefl)) {
printf("File not created!\n");
return;
}
fl=fopen(imefl,"rb"); k=0;
fread(&lice,sizeof(lice),1,fl);
while (!feof(fl)){
k++; writeLice(lice);
fread(&lice,sizeof(lice),1,fl);
}
if (k==0) printf("File is empty\n");
fclose(fl);
}
int main()
{
int c;
printf("File name: ");gets(imefl);
do {
printf("%20sMENU FOR OPERATIONS:\n","");
printf("%26s1. create a new file\n","");
printf("%26s2. add components\n","");
printf("%26s3. del components\n","");
printf("%26s4. replace components\n","");
printf("%26s5. born in\n","");
printf("%26s6. list of all\n","");
printf("%20sSelect or 0 for end: ","");
scanf("%d",&c);getchar();
switch (c){
case 1:szdPrz();break;
case 2:dobaviane();break;
case 3:iztrivane();break;
case 4:zamiana();break;
case 5:spisGod();break;
case 6:obSpis();
}
}while (c!=0);
}
