GCC stands for GNU C Compiler, it's a solid compiler that works well on the *nix kernels, there's a port of it on cygwin which is arguably slower but still works. Whether it's the best or not depends on what platform you are working on and with what you're trying to make on it.
Standard Postcard-a standard postcard mails First Class at current rate of 35Â¢. The smallest maiLabel size for ANY postcard is 3Â½â³ x 5.â³. The largest postcard size for mailing at the 35Â¢ rate is 4Â¼â³ x 6.â³. The paper thickness must be at least 0.007 â³ and not more than 0.016 â³ in thickness.
You can check the postal guide below for these requirements. Q: What are the postcard sizes that can be mailed in bulk and those that comply with the mailing regulations? A: All standard postcard sizes, from 4â x 6â up to 6â x 11â (flat or folded to size), can be mailed. Sizes should fit within the requirements of the United States Postal Service (USPS). Q: What are the postage rates that apply to mailed postcards? A: Rates will vary depending on the postcard size of your choice. For example, a 4â x 6â and 4.25â x 6â sized postcard can qualify for First Class Card rate. Meanwhile, 4.5â x 6â up to 6â x 11â postcards, whether flat or folded, qualify for either First Class Letter rate or Standard Bulk rate.