I am writing a code to open a command line, prompt for the name of a file to copy, prompt for a new file name, then it should copy the file (adding a header and line numbers plus adding .lis to the filename of the new file). I BELIEVE I have the code correct for the header and line numbers, but I am getting a runtime error. I am getting an error of: "Access violation writing location 0x00000000." Can anyone help me understand what I have done wrong in my code. I simply want it to be able to copy the file for now. Once it will copy a file, I can look at the new file to see what needs debugged in regards to the header and line numbers.
I appreciate any help you can give.
/* Program to take a command line argument that is the name of a text file and creat a new text file
* with a heading line and the contents of the original file with line numbers added. New file
* appends ".lis" to the new filename prior to the extension.
*/
#include <stdio.h>
#include <stdlib.h>
int
main(int argc, char *argv[])
{
FILE *inp, *outp,;
char ch;
int i = 0;
printf("Enter the name of the file you want to back up.>");
scanf("%s", argv[0]);
printf("Enter the name of the file to back up to.>");
scanf("%s", argv[1]);
if (argc == 2)
{
inp = fopen(argv[0], "r");
if (inp == NULL)
{
printf("\nCannot open file %s for input\n", argv[0]);
}
outp = fopen(argv[1], "a+");
if (outp == NULL)
{
printf("\nCannot open file %s for output\n", argv[1]);
}
fprintf(outp, "%s%s%s%s", "*****************", argv[1], ".lis", "*****************\n");
for (ch = getc(inp); ch != EOF; ch = getc(inp))
{if (ch == '\n')
{
fprintf(outp, "\n%d", i);
++i;
}
}
putc(ch, outp);
fclose(inp);
fclose(outp);
printf("\nCopied %s to %s.lis\n", argv[0], argv[1]);
}
else
printf("Invalid argument list: Include two file names\n");
return(0);
}
