Question

Write a simple C/C++ function, void copy_create(char * file), that would take one text file name as parameter and create a file named “duplicate.txt”, having the content of the file name sent as parameter.

Answer 1

#include <stdio.h>

void copy_create(char * file) {
    FILE *f = fopen(file, "r");
    if (f) {
        FILE *w = fopen("duplicate.txt", "w");
        char ch;
        while ((ch = (char)fgetc(f)) != EOF) {
            fputc(ch, w);
        }
        fclose(w);
        fclose(f);
    } else {
        printf("%s does not exists!\n", file);
    }
}

int main() {
    copy_create("input.txt");
    return 0;
}