codice:
#include <stdio.h>

void open(char *);
void write(char *);

int main(int argc, char *argv[])
{
	if(argc != 3)
		printf("3");
	else{
		printf("\nInput %s\nOutput %s\n",argv[1], argv[2]);
                open(argv[1]);
		write(argv[2]);
	}
	return 0;
}

void open(char *op)
{
	FILE *in;
        if ((in=fopen(op, "r"))==NULL) {
            printf("no file found\n");
            return;
        }
	/*fai quello che devi fare*/
        fclose(in);
}

void write(char *wr)
{
	FILE *out;
        if ((out=fopen(wr, "w"))==NULL) {
            printf("no file found\n");
            return;
        }
	/*fai quello che devi fare*/
	fclose(out);
}