Parsing file into an array [duplicate] - c

Question

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what's the preferred library for CSV parsing/writing in C++? [closed]
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Good day. Don't know whether this question has been asked before. Any who, I have a text file with contents like below
AP0003;Football;13.50;90
AP0004;Skateboard;49.90;30
It is basically,
Item Code;Item Name;Price per unit;Quantity
I am trying to put the contents of the text file into an array but I've had no luck so far. And, I can't find anything similar on Stack Overflow (or maybe my search parameters is not accurate). Would appreciate any help I can get. Am new to C Programming.

Answer 1

Firstly open the file using fopen:
FILE* fp = fopen("NAME_OF_FILE.txt", "r"); // "r" stands for reading
Now, check if it opened
if(fp == NULL) //If fopen failed
{
printf("fopen failed to open the file\n");
exit(-1); //Exit program
}
Suppose that these are your arrays to store the line and each data are:
char line[2048]; //To store the each line
char itemCode[50];
char item[50];
double price;
int quantity; //Variables to store data
Read the file using fgets. It consumes line by line. Put it in a loop which terminates when fgets returns NULL to scan the whole file line by line. Then extract data from the scanned line using sscanf. It, in this case, will return 4 if successful:
while(fgets(line, sizeof(line), fp) != NULL) //while fgets does not fail to scan a line
{
if(sscanf(line, "%[^;];%[^;];%lf;%d", itemCode, item, price, quantity) != 4) //If sscanf failed to scan everything from the scanned line
//%[^;] scans everything until a ';'
//%lf scans a double
//%d scans an int
//Better to use `"%49[^;];%49[^;];%lf;%d"` to prevent buffer overflows
{
printf("Bad line detected\n");
exit(-1); //Exit the program
}
printf("ItemCode=%s\n", itemCode);
printf("Item=%s\n", item);
printf("price=%f\n", price);
printf("Quantity=%d\n\n", quantity); //Print scanned items
}
Finally, close the file using fclose:
fclose(fp);

Answer 2

You can try this code :
#include <stdio.h>
#include <stdlib.h>
int main()
{
char str1[1000],ch;
int i=0;
FILE *fp;
fp = fopen ("file.txt", "r"); //name of the file is file.txt
while(1)
{
fscanf(fp,"%c",&ch);
if(ch==EOF) break; //end of file
else str[i++]=ch; //put it in an array
}
fclose(fp);
return(0);
}
This will put your entire file into an array str including '\n' and other special characters.If you dont want the special characters put neccessary conditions in the while loop.