Question

C program Read file problem:

For example, I have an input.txt file like this:
q 1 tq 4 p1 10 p2 5 p3 7 p4 20 p5 17 p6 9 p7 3 p8 11 p9 15 p10 1

I want the num of q is in one array, tq is in one array, the order of process(ie,p1,p2) is in one array, and process time is in one array(process time is the number after like p1,p2). There may many q,tq,p so it may be like this
q 1 tq 4 p1 30 p2 10 p3 24 p4 20 p5 17 p6 4 p7 7 p8 11 p9 8 p10 9 p11 5 p12 6 p13 3 p14 2 p15 1

q 2 tq 5 p1 1 p2 2 p3 2 p4 9 p5 8 p6 5 p7 12 p8 11 p9 15 p10 1 p11 4 p12 8 p13 22 p14 21 p15 30

q 3 tq 30 p1 30 p2 10 p3 24 p4 20 p5 17 p6 4 p7 7 p8 11 p9 8 p10 9 p11 5 p12 6 p13 3 p14 2 p15 1

how can I get the array from input file? It must be C program.

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAXR 50
#define MAXC 1024

// Function to read dates from file and stores it in character matrix process
// Returns number of rows by using pointer
void readFile(char process[][MAXC], int *r)
{
// Creates a file pointer to open the file Process.txt in read mode
FILE *rFile = fopen("Process.txt", "r");

// Checks if file is unable to open then display error message
if (rFile == NULL)
{
// Display error message
puts("Error: Could not open files");
exit(0);
}// End of if
// To store the data read from file
char data [MAXC];

// Extracts data from file
while (!feof(rFile))
{
// Extracts data from file
fscanf(rFile, "%s,", data);

// Checks if data is "q"
if(strcmp(data, "q") == 0)
{
// Increase the row by one
*r = *r + 1;
// Concatenates data with space
strcat(data, " ");
// Copies data to process row index position
strcpy(process[*r], data);
}// End of if condition

// Otherwise
else
{
// Concatenates data with space
strcat(data, " ");
// Concatenates process r index position string with data
strcat(process[*r], data);
}// End of else
}// End of while loop
// Close the file
fclose(rFile);
}// End of function

// Function to display contents of matrix
void show(char process[][MAXC], int row)
{
// Loop variable
int r, c;

// Loops till number of rows
for(r = 0; r < row; r++)
{
// Displays each row data
printf("\n %s", process[r]);
// Displays new line
printf("\n");
}// End of for loop
}// End of function

// main function definition
int main()
{
// Creates a character matrix
char process[MAXR][MAXC];
// To store number of rows
int row = -1;
// Calls the function to read data
readFile(process, &row);
// Calls the function to display data
show(process, row+1);
return 0;
}// End of main function

Sample Output:

q 1 tq 4 p1 30 p2 10 p3 24 p4 20 p5 17 p6 4 p7 7 p8 11 p9 8 p10 9 p11 5 p12 6 p13 3 p14 2 p15 1

q 2 tq 5 p1 1 p2 2 p3 2 p4 9 p5 8 p6 5 p7 12 p8 11 p9 15 p10 1 p11 4 p12 8 p13 22 p14 21 p15 30

q 3 tq 30 p1 30 p2 10 p3 24 p4 20 p5 17 p6 4 p7 7 p8 11 p9 8 p10 9 p11 5 p12 6 p13 3 p14 2 p15 1

Process.txt file contents

q 1 tq 4 p1 30 p2 10 p3 24 p4 20 p5 17 p6 4 p7 7 p8 11 p9 8 p10 9 p11 5 p12 6 p13 3 p14 2 p15 1 q 2 tq 5 p1 1 p2 2 p3 2 p4 9 p5 8 p6 5 p7 12 p8 11 p9 15 p10 1 p11 4 p12 8 p13 22 p14 21 p15 30 q 3 tq 30 p1 30 p2 10 p3 24 p4 20 p5 17 p6 4 p7 7 p8 11 p9 8 p10 9 p11 5 p12 6 p13 3 p14 2 p15 1