Question

I am new in C program and linux, how can we compile and run this program?

I have tried gcc example.c then ./a.out but it gives an error like input file cannot be opened ( I have written this error in the read method)

// example.c
int main(int argc, char *argv[])
{
    char* input = argv[1];
    read(input);

    char* output = argv[2];
    write(output);

    return 0;
} 

Thanks.

Answer 1

Your program isn’t going to work very well – you’re not providing enough arguments to read and write, for example (assuming you mean to be calling POSIX read(2) and write(2), that is).

To answer your actual question, the problem appears to be that you’re not providing any arguments. You need to run it something like:

./a.out FILE1 FILE2

replacing FILE1 with the name of your input file and FILE2 with the name of your output file.