luc096.c

Metadata

• Author — Amit Dutta
• Last updated — 08 Feb 2026
• License — MIT License (See the LICENSE file for details)

Problem Statement

Problem Statement

Write a program that can copy the contents of one file to another. The source and target filenames should be supplied as command-line arguments.

Source Code

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int main(int argc, char *argv[])
{
    FILE *fs, *ft;
    char ch;

    /* Check for correct number of arguments */
    if (argc != 3)
    {
        printf("Usage: %s <source_file> <target_file>\n", argv[0]);
        exit(1);
    }

    fs = fopen(argv[1], "r");
    if (fs == NULL)
    {
        printf("Error: Cannot open source file '%s'\n", argv[1]);
        exit(2);
    }

    ft = fopen(argv[2], "w");
    if (ft == NULL)
    {
        printf("Error: Cannot create target file '%s'\n", argv[2]);
        fclose(fs);
        exit(3);
    }

    /* Copy contents */
    while ((ch = fgetc(fs)) != EOF)
    {
        fputc(ch, ft);
    }

    printf("File copied successfully.\n");

    fclose(fs);
    fclose(ft);
    return 0;
}