C++ File IO vs C File IO

// C++ File IO (what I need)

#include <cstdlib>
#include <iostream>
#include <fstream>
#include <string>

using namespace std;

/*
 * Main function.
 */
int main(int argc, char** argv) {
    std::string file_name = argv[1];
    std::ifstream inf(file_name);
    if (!inf) {
        std::cerr << "uhoh cannot read file!" << std::endl;
    }

    while (inf) {
        std::string text;
        std::getline(inf, text);
        std::cout << text << std::endl;
    }

    return 0;
}

// C File IO (what I need)
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>

/*
 * The main function.
 */
int main(int argc, char** argv) {

    if (argc == 2) {
        printf("\nArgument: %s\n", argv[1]);
        FILE *fp = fopen(argv[1], "r");
        if (fp != NULL) {
            char output[50] = "";
            char other_output[] = "Error!";
            puts("Going to print out the data");
            while (!feof(fp)) {
                fgets(output, 50, fp);
            }
            fclose(fp);
            printf("%s", output);
        }
    } else if (argc > 2) {
        printf("Too many commands supplied.\n");
    } else {
        printf("Not enough commands supplied.\n");
    }

    return (EXIT_SUCCESS);
}