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https://jennychen9827sbu.github.io/CAD281/filescan.html

Sample Questions with Source Code

Flight Schedule

ESE 124 Grader Filter

Edit 2D Character Array

Student Record Processor

Advanced Identifier Scanner

Token Analyzer

🧾 Reading Text Files in C – fscanf, fgets, fgetc

What are these?

Function Purpose Reads by...
fscanf() Reads formatted input (like scanf) words or numbers
fgets() Reads one full line as a string entire line
fgetc() Reads one character at a time character

1. fscanf – Read numbers or words

Sample File: numbers.txt

10 20 30
40 50

Code: read_fscanf.c

#include <stdio.h>

int main() {
    FILE* fp = fopen("numbers.txt", "r");
    int num;

    if (!fp) {
        printf("File not found.\n");
        return 1;
    }

    while (fscanf(fp, "%d", &num) != EOF) {
        printf("Number: %d\n", num);
    }

    fclose(fp);
    return 0;
}

2. fgets – Read full lines (good for strings)

Sample File: lines.txt

Hello, ESE 124!
C programming is fun.
File reading line by line.

Code: read_fgets.c