Question

Sorry for asking very simple question.I’m new to coding.
Input txt file

5,3
001
110
111
110
001

I need to print the output as

U1: 001
U2: 110
U3: 111
U4: 110
U5: 001

Upto now I was able to print the contents with this:

  #include <stdio.h>
  void main() {
    FILE *fopen(), *fp;
    int c;

    fp = fopen("read.txt","r");
    c = getc(fp) ;

    while (c!= EOF) {
      putchar(c);
      c = getc(fp);
    }

    fclose(fp);
  }

Can Anybody tell how should I proceed?

Answer 1

Most of your work is done inside the while loop.
But you’re not doing enough work …
a) you need to count lines
b) you need to print the "U#"

Suggestion: create a variable for the line counting business and rewrite your loop to consider it. Here’s a few snippets

int linecount = 0;

printf("U%d: ", linecount)

if (c == '\n') linecount += 1;

---

Oh! You really shouldn’t add the prototype for fopen yourself. It is already specified with #include <stdio.h>.

And well done for declaring c as int. Many people do the error of declaring it char which is incompatible with EOF and all the range of characters