Coding Exercise – Simple [nl] Implementation on Windows Platform using C++ (GCC)

root@uploadbeta:~# nl --help | head -2
Usage: nl [OPTION]... [FILE]...
Write each FILE to standard output, with line numbers added.

root@uploadbeta:~# nl
HelloACM.com
     1  HelloACM.com
Rocks!
     2  Rocks!
hello
     3  hello

root@uploadbeta:~# echo -e "test1\ntest2\ntest3" > test
root@uploadbeta:~# nl test test
     1  test1
     2  test2
     3  test3
     4  test1
     5  test2
     6  test3

root@uploadbeta:~# nl test test aa
     1  test1
     2  test2
     3  test3
     4  test1
     5  test2
     6  test3
nl: aa: No such file or directory

    if (argc == 1) {
        int num = 1;
        while (true) {
            string s;
            getline(std::cin, s);
            if (cin.eof()) break; // check for Ctrl + D
            cout << TAB << num << TAB << s << endl;
            num ++;
        }
        return 0;
    }

    if ((argc == 2) && (strcmp(argv[1], "--help") == 0)) {
        cout << "http://HelloACM.com" << endl;
        cout << "Usage: nl [FILE]..." << endl;
        cout << "Write each FILE to standard output, with line numbers added." ;
        return 0;
    }

    int num = 1;
    for (int i = 1; i < argc; i ++) {
        ifstream f(argv[i]); // open file
        if (f.good()) { // check if is a file and can be opened
            string s;
            while (getline(f, s)) {  // read a line
                cout << TAB << num << TAB << s << endl;
                num ++; 
            }
            f.close();
        } else {
            f.close();
            cout << "nl: " << argv[i] << " is not a file." << endl;
        }
    }

#include <iostream>
#include <fstream>
#include <string.h>

using namespace std;
const char TAB = 9;

int main(int argc, char *argv[]) {
    if (argc == 1) {
        int num = 1;
        while (true) {
            string s;
            getline(std::cin, s);
            if (cin.eof()) break; // check for Ctrl + D
            cout << TAB << num << TAB << s << endl;
            num ++;
        }
        return 0;
    }
    if ((argc == 2) && (strcmp(argv[1], "--help") == 0)) {
        cout << "http://HelloACM.com" << endl;
        cout << "Usage: nl [FILE]..." << endl;
        cout << "Write each FILE to standard output, with line numbers added." ;
        return 0;
    }
    int num = 1;
    for (int i = 1; i << argc; i ++) {
        ifstream f(argv[i]);
        if (f.good()) {
            string s;
            while (getline(f, s)) {
                cout << TAB << num << TAB << s << endl;
                num ++;
            }
            f.close();
        } else {
            f.close();
            cout << "nl: " << argv[i] << " is not a file." << endl;
        }
    }
    return 0;
}

root@uploadbeta:~# cat sqrt | nl
     1  #!/bin/bash
       
     2  if [ $# -ne 1 ]; then
     3    echo 'Usage: sqrt number'
     4    exit 1
     5  else
     6     echo -e "sqrt($1)\nquit\n" | bc -q -i | head -2 | tail -1
     7  fi
root@uploadbeta:~# 

#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <string.h>
#include <inttypes.h>
#define TAB '\t'
#define MAX_LINE_SIZE sizeof(char) * 65536
#define EOL "\r\n"
#define NLPRINT LineNumber++;printf("%c%d%c%s",TAB,LineNumber,TAB,Line)
int main(int argc, char **argv){
    uint32_t LineNumber = 0;
    char *Line = (char *)malloc(MAX_LINE_SIZE);
    memset(Line,0,MAX_LINE_SIZE);
    puts("Kevin Guanche Darias :: nl tool");
    // File not specified use  stdin
    if(argc == 1){
        while(1){
            fgets(Line,MAX_LINE_SIZE,stdin);
            if(feof(stdin)) break;
            NLPRINT;
        }
        return EXIT_SUCCESS;
    }else if(argc == 2 && (strcmp(argv[1],"--help") == 0)){ // Show help
        puts("Kevin Guanche Darias nl for Windows");
        printf("Usage: %s [File]..."EOL,argv[0]);
        puts("Writes each file to standard output, with line numbers added");
        return EXIT_SUCCESS;
    }
    FILE *FilePointer;
    int i;
    for(i = 1; i < argc;(i++)){
        FilePointer = fopen(argv[i],"r");
        if(FilePointer != NULL){
            while(!feof(FilePointer)){
                fgets(Line,MAX_LINE_SIZE,FilePointer);
                NLPRINT;
            }
        }else{ // File Error
            printf("%s: %s is not a file "EOL,argv[0],argv[i]);
        }
        fclose(FilePointer);
    }
    return EXIT_SUCCESS;
}