[c++] 新手 求解一道题（最好带注释）

Calculate a + b

Input The input will consist of a series of pairs of integers a and b, separated by a space, one pair of integers per line.

Output For each pair of input integers a and b you should output the sum of a and b in one line, and with one line of output for each line in input.

Sample Input 1 2 3 4 5 6 Sample Output 3 7 11

Calculate A + B

Input and output are the same with problem 1001. But A and B are big non-negative integers. The biggest integer is less than 10^500.

Sample Input

1234567890987654321 9876543210123456789 123456789123456789 321654987321654987 9081321110693270343633073697474256143563558458718976746753830538032062222085722974121768604305613921745580037409259811952655310075487163797179490457039169594160088430571674960498834085812920457916453747019461644031395307920624947349951053530086146486307198155590763466429392673709525428510973272600608981219760099374675982933766845473509473676470788342281338779191792495900393751209539300628363443012 6538005862664913074813656220643842443844131905754565672075358391135537108795991638155474452610874309742867231360502542308382199053675592825240788613991898567277116881793749340807728335795394301261629479870548736450984003401594705923178314906195914825136973281314862289454100745237769034410057080703111299605127114594552921209928891515242515620324828055912854227507525717981351447473570262981491527798 Sample Output

11111111101111111110 445111776445111776 15619326973358183418446729918118098587407690364473542418829188929167599330881714612277243056916488231488447268769762354261037509129162756622420279071031068161437205312365424301306562421608314759178083226890010380482379311322219653273129368436282061311444171436905625755883493418947294462921030353303720280824887213969228904143695736988751989296795616398194193006699318213881745198683109563609854970810