I am quite stuck with a little problem. I have a variable actual_account_balance which I need to set as global so that it’s value can be shared and updated between functions, but I have no idea how to do that so that i wouldn’t have to change too many things in the code.
I try to set variable actual_account_balance as global
Here is my code:
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <string.h>
void addRecord();
void viewRecord();
void deleteRecord();
void clear();
void delay(int);
void printTitle(bool clearContent, int titleType);
void printError(int errorType);
void printChoices();
void login();
struct diary
{
char date[15];
char time[10];
char place[25];
char msg[500];
//int actual_account_balance;
char spent_today[15];
} d1;
int actual_account_number ;
int main()
{
int actual_account_balance=1000000;
login();
int choice;
bool run = true;
while(run){
printTitle(true, 2);
printChoices();
printf("\n\t\t P R E S S Y O U R C H O I C E K E Y\n\t\t\n");
scanf("%d",&choice);
getchar();
switch (choice)
{
case 1:
addRecord();
break;
case 2:
viewRecord();
break;
case 3:
deleteRecord();
break;
case 4:
printf("\n\nClosing the system...\n");
delay(2);
clear();
run = false;
break;
default:
printTitle(true, 2);
printf("\n\n\t\t\t\t [X]:Invalid Input :(\n\n\t\t");
delay(1);
printf("\n\t\t P R E S S Y O U R C H O I C E K E Y\n\t\t");
delay(1);
printf("\n");
delay(7);
break;
}
}
}
void delay(int a)
{
sleep(a);
}
void addRecord()
{
FILE *fp;
fp = fopen("diary.txt", "a");
if (fp == NULL)
{
printError(1);
exit(1);
}
char *spent_today;
int actual_account_balance = 10000 ;
printTitle(true, 2);
printf("\n\t # Enter_Date(dd/mm/yyyy) : ");
fgets(d1.date, 15, stdin);
printf("\n\t # Enter_Time(hh:mm am/pm) : ");
fgets(d1.time, 10, stdin);
printf("\n\t # Enter_Location(place name) : ");
fgets(d1.place, 25, stdin);
printf("\n\t # Enter_Message : ");
fgets(d1.msg, 500, stdin);
printf("\n\t # Spent_today : ");
fgets(d1.spent_today, 15, stdin);
int spent_today_int = atoi(d1.spent_today);
actual_account_balance -= (spent_today_int);
printf("\n\t # Actual_Account_Balance :%d ", actual_account_balance);
//fgets(d1.msg,500,stdin);
printf("\n\nSaving...\n");
fwrite(&d1, sizeof(d1), 1, fp);
delay(2);
fclose(fp);
}
void viewRecord()
{
int actual_account_balance;
FILE *fp;
int ch, j = 1;
fp = fopen("diary.txt", "rb");
if (fp == NULL)
{
printError(1);
exit(1);
}
clear();
printTitle(true, 2);
for (int i = 1; fread(&d1, sizeof(d1), 1, fp) != 0; i++)
{
printf("\n\t # Record %d) : %s \t %s \t %s \t %s \t", i, d1.date, d1.time, d1.place, d1.spent_today);
}
fclose(fp);
printf("\n\n\t Which record you want to see from above?\n\t Enter record number : ");
scanf("%d", &ch);
getchar();
fp = fopen("diary.txt", "rb");
if (fp == NULL)
{
printError(1);
exit(1);
}
printTitle(true, 2);
for (j; fread(&d1, sizeof(d1), 1, fp) != 0; j++)
{
if (j == ch)
{
printf("\n\t\t Date : %s", d1.date);
printf("\n\t\t Time : %s", d1.time);
printf("\n\t\t Location : %s", d1.place);
printf("\n# Record,\n %s", d1.msg);
printf("\n\t\t Spent today : %s", d1.spent_today);
printf("\n\t\t Account balance : %d", actual_account_balance);
break;
}
}
fclose(fp);
if (j != ch)
{
printf("\n\t The record is not match, please check and try again.");
}
printf("\n\n\t\t\t\tPress any key..!");
getchar();
}
void deleteRecord()
{
int flage = 0, ch;
FILE *fp, *tptr;
fp = fopen("diary.txt", "rb");
if (fp == NULL)
{
printError(1);
exit(1);
}
printTitle(true,1);
for (int i = 1; fread(&d1, sizeof(d1), 1, fp) != 0; i++)
{
printf("\n\t\t# Record %d) : %s %s %s", i, d1.date, d1.time, d1.place);
}
printf("\n\n\t Which record you want to delete from above?\n\t Enter record number : ");
scanf("%d", &ch);
fclose(fp);
fp = fopen("diary.txt", "rb");
if (fp == NULL)
{
printf("\nFile is not found");
exit(1);
}
tptr = fopen("temp.dat", "ab");
for (int i = 1; fread(&d1, sizeof(d1), 1, fp) != 0; i++)
{
if (ch != i)
{
fwrite(&d1, sizeof(d1), 1, tptr);
}
else
{
flage = 1;
}
}
fclose(fp);
fclose(tptr);
remove("diary.txt");
rename("temp.dat", "diary.txt");
if (flage == 0)
{
printf("\n\n\t\tRecord is not found..!");
}
else
{
printf("\n\t *Record deleted successfully, press any key...");
}
getchar();
}
void clear(){
system("clear");
}
void printTitle(bool clearContent, int titleType){
if(clearContent){
clear();
}
switch (titleType) {
case 1:
printf("\n\n\t\n\t P E R S O N A L D I A R Y M A N A G E M E N T S Y S T E M :)\n");
break;
case 2:
printf("\n\n\n\t\t\n\t\t P E R S O N A L D I A R Y M A N A G E M E N T S Y S T E M\n\t\t");
break;
}
}
void printError(int errorType){
switch (errorType) {
case 1:
printf("\nFile is not found");
break;
}
}
void printChoices(){
printf("\n\t\t\t\t PRESS[1]:Add Record");
printf("\n\t\t\t\t PRESS[2]:View Record");
printf("\n\t\t\t\t PRESS[3]:Delete Record");
printf("\n\t\t\t\t PRESS[4]:Exit\n\t\t");
}
void login() {
char username[20], *password;
while (1) {
clear();
printf("\n\t\t P E R S O N A L D I A R Y M A N A G E M E N T S Y S T E M\n\t\t");
for (int i = 0; i < 62; i++)
{
printf("%c", 22);
}
printf("\n\n\t\t\tUsername: ");
scanf("%s", username);
// vyprázdnění bufferu stdin
int c;
while ((c = getchar()) != '\n' && c != EOF);
password = getpass("\n\t\t\tPassword: ");
if (strcmp(username, "user") == 0 && strcmp(password, "123") == 0){
printf("\n\n\t\t\tWelcome. Login Success!\n");
break;
} else {
printf("\n\n\t\t\tInvalid username or password. Try again.\n");
sleep(3);
}
}
}```
ps I run it in ubuntu console
>Solution :
I have a variable actual_account_balance which I need to set as global so that it’s value can be shared and updated between functions
You can do that by moving the declaration OUT of main:
int actual_account_balance=1000000;
and also removing all declaration of that variables that you are having in every other functions.