Question

txt file iuput in C.

If there is a txt file which only contain one row like

1 2 3

How can I read these three integers individually as a special value to pass to a integer i and the size of a two dimensional array like:

int i = 1;

array a[ 2 ][ 3 ] = {};

Thanks

Answer 1

CODE:

#include <stdio.h>
#include <stdlib.h>
int main()
{
int i,m,n; //declaring three variable to read
FILE *fptr; //declaring file pointer
if ((fptr = fopen("input.txt", "r")) == NULL)
{ //checking file open status
printf("File not opend successfully!!");
exit(1);   
}
//reading i,array dimension from file
fscanf(fptr,"%d", &i); //reading 1st value i.e i
fscanf(fptr,"%d", &m); //reading second value i.e rows
fscanf(fptr,"%d", &n); //reading 3rd value i.e column
int arr[m][n]; //declaring array according to given dimensions
printf("Readed i , dimension values are: i=%d , m=%d , n=%d",i,m,n); //printing the readed inputs.
fclose(fptr);
  
return 0;
}

CODE IMAGE:

OUTPUT:

FILE: