Calculating Monthly Money Expenditure From a Txt File in C - c

Question

How to make monthly and yearly calculations from a txt file in C language? I'm trying to make a C language read and write program, but I'm confused about how to perform operations from it. I'm confused, please help me
This is an example of a txt file that was written
Jaka 2022 12 10 50000
Juki 2020 10 12 750000
Jaka 12 10 10 4000
And here's the code that I made, it's still limited to calculating all total expenses, I can't calculate monthly and yearly.
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
void input();
void count();
void monthly_expenditure();
int main()
{
int choice;
do
{
printf("====================================MENU====================================\n");
printf("1. Input Data\n");
printf("2. count expenditure\n");
printf("3. monthly expenditure\n");
printf("4. exit\n");
printf("choice : ");
scanf("%d", &choice);
switch (choice)
{
case 1:
input();
getchar();
break;
case 2:
count();
getchar();
break;
case 3:
monthly_expenditure();
getchar();
break;
case 4:
printf("thank you\n");
getchar();
break;
default:
printf("error\n");
break;
}
} while (choice != 4);
return 0;
}
void input()
{
FILE *fp;
char name[100], year[100], month[100], date[100], money[100];
fp = fopen("data.txt", "a");
printf("Input name : ");
scanf("%s", name);
printf("Input year : ");
scanf("%s", year);
printf("Input month : ");
scanf("%s", month);
printf("Input date : ");
scanf("%s", date);
printf("Input money : ");
scanf("%s", money);
fprintf(fp, "%s %s %s %s %s\n", name, year, month, date, money);
fclose(fp);
}
void count()
{
FILE *fp;
char name[100], year[100], month[100], date[100], money[100];
int total = 0;
fp = fopen("data.txt", "r");
while (fscanf(fp, "%s %s %s %s %s", name, year, month, date, money) != EOF)
{
total += atoi(money);
}
printf("Total expenditure : %d\n", total);
fclose(fp);
}
void monthly_expenditure(){
}
void year_expenditure(){
}

Answer 1

Create one function that passes in the desired year and month.
Use fgets() to read a line of input, then parse. This has far better error handling.
Do not test against EOF, one of the many return values from *scanf() that you do not want. Test against the return value you want.
Use int for year, month, day.
Use a width with %s to avoid buffer overflow.
Recommend a wider type for money.
Illustrative untested code:
// Filter per year. Use 0 for all years, all months
// Return error code.
int count_filter(int year, int month) {
FILE *fp = fopen("data.txt", "r");
if (fp == NULL) {
return 1;
}
long total = 0;
char buf[200];// Some large buffer
while (fgets(buf, sizeof buf, fp)) {
char name[100];
int y, m, d;
long money;
if (sscanf(buf, "%99s %d %d %d %ld",
name, &y, &m, &d, &money) != 5) {
// Incorrect format
fclose(fp);
return 3;
}
if ((year == 0 || year == y) && (month == 0 || month == m)) {
total += money;
}
}
fclose(fp);
printf("Total expenditure: %ld\n", total);
return 0;
}
Now call as needed:
count_filter(0,0); All expenditures
count_filter(2022,12); Just this month
count_filter(2021,0); Last year
count_filter(0,12); All Decembers