Question

how can I Use fscanf() inside a loop to read each line in C language?

also how can I take the values from the file and add them together for example if the file contents are

2

4

6

I want to read the first line and add 2 then the second one and add 4 and then the third and 6 and finally return the total 12 and stop reading.

I do not want to store the values in an array so I want to be able to deal with the data while I am reading each line.

Answer 1

Program:

#include<stdio.h>
int main()
{
    FILE* ptr = fopen("abc.txt","r");
    if (ptr==NULL)
    {
        printf("\nno such file.\n");
        return 0;
    }

    int num, sum = 0;
  
    while (fscanf(ptr,"%d",&num)==1)
       sum += num;
  
   printf("\nSum of numbers is : %d\n\n",sum);
  
    return 0;
}

Screenshot: ( for reference )

Output:

Note: If you have any doubts please comment.

It will be great help If you like.