#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

// When reading files, it starts with the first byte and progresses.  After calling
// fgetc(…), the file position moves forward by one byte.  If we call fgetc(…) AFTER
// having read the last byte in the file, it returns a special value EOF (== -1) which
// indicates that you have read past the end of the file.  AFTER it has returned EOF,
// calling feof(stream) will return true.  The semantics here are important.

// Okay to copy/adapt this code if you understand it.  Correctness if your responsibility.

void cat(char const* path) {
    FILE* stream = fopen(path, "r");  // to open for reading, mode is "r"
                                      // for writing → "w", for appending → "a"

    for(char ch = fgetc(stream); ! feof(stream); ch = fgetc(stream)) {
        fputc(ch, stdout);       // write that character to stdout
    }

    // DO NOT USE EOF in your code!!!  Use the formulation above.

    fclose(stream);

    // Always call fclose(…) once for every time you call fopen(…).
}

int main(int argc, char* argv[]) {
    cat("animal.txt");
    return EXIT_SUCCESS;
}
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