Unix cat -n command implementation

Question

How do i include cat -n command in my program implementation This is the problem with my program and i cant get it to print a new line number after every line so any suggestions on what i could do to rectify this

if(argv[1] == "-n")
{
    fd = open(argv[i],O_RDONLY);
    printf("%d\t",line);
    while(n = read(fd,&s,1) > 0)
    {
        if(s == '00')
        {
            line++;
            printf("\n%d\t",line);
        }   
        printf("%c",s);
    }
}   

Answer 1

while (n = read(fd,&s,1) > 0)

missing parentheses. > has higher precedence than = .

if(s == '00')

This is not how you detect an end of line. An end of line is typically a '\\n' character in unix-like systems.