For example, if you had a batch file called stuff.bat and you typed stuff a b c d at the command prompt, the letters a, b, c, and d would be assigned to the variables %1, %2, %3, and %4, respectively.
Fiberglass shingles generally have a longer life expectancy than do asphalt shingles. Properly installed tiled roofs have a normal useful life of 20-30 years or longer, but individual pieces can become cracked or broken or the nails rust out.
The average shingle roof, properly installed, should last anywhere from 20 years (for asphalt or torchdown roof), 30-40 years (wood shingled roof), 50+ years (metal roofs) and 100+ years (clay tile shingles). Your home has layers to help protect it from the environment and to effectively insulate the home.