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for all language c is base so that c should study perfectly by getting book of local author so that you can understand easily also make use of w3school website that too helps lot and lot

TI-89 is good but price differs for place to place better to get an used one it would be better

Only way is to reset button or else you should go to service center to reset the chipset

its Waves or frequency that reflect against speakers it won't beeps unless you get call or searching for network

ya grounding also make this problem once i suffer but also check all the phones receiver are kept properly it too affect like this