Reg 42: Fill & Download for Free

In the C language, why can't we take the address of a variable declared register?Partly to aid in optimization, partly for historical reasons.Originally, defining a variable with the register keyword meant that the compiler would allocate a CPU register to store the variable, rather than storing it in memory. Access to registers is typically much faster than access to memory — and on most CPUs (there have been exceptions), CPU registers don’t have addresses. An address refers to a location in memory.In more modern versions of C, the semantics of register are defined more vaguely. The C standard says nothing about CPU registers (not all CPUs even have accessible registers). Instead, the current C standard says:A declaration of an identifier for an object with storage-class specifier register suggests that access to the object be as fast as possible. The extent to which such suggestions are effective is implementation-defined.It says nothing about how this “fast as possible” access is to be achieved. A variable declared register might not be stored in a register, and a variable not declared register might be stored in a register, or might be optimized away entirely if the compiler can determine that nothing depends on its value.And the standard still says that a register variable cannot have its address taken. Letting the compiler know that an object’s address is never taken lets generate better code in some cases. For example, it doesn’t have to worry that a pointer might point to the variable:register int reg = 42; int *ptr = /* … */; /* ... */ *ptr = 0; printf(“reg = %d\n”, reg); The compiler can know that the assignment cannot change the value of reg, because ptr cannot point to reg, so the printf call might be optimized to puts("reg = 42").On the other hand, since register can only apply to local (block scope) objects, the compiler probably knows this already by examining the code.In older and small compilers register could be an effective way to let the compiler know which variables are used heavily and need to be optimized. A modern optimizing compiler can probably figure that out better than the programmer can, and can adjust that determination every time the code is modified and recompiled.

Of course I can.I’m Hari Ashwath Ramachandran, Reg no. 1580148946.I got 62 in Prelims, and in Mains I secured 117.88.Overall Score was 50.31. Yes, I screwed up in the interview when I was suddenly quizzed about Karnataka State Schemes and Current Affairs related to recent programmes launched by the state government. I got 8.4/20 (equivalent to 42/100).Cheers!

Because for most of us, it would be a significant downgrade in lifestyle. Salaries might be slightly higher and taxes might be a little less (not much in either direction though), but we’d get massively less value for the money we pay in taxes and we’d have to make up that shortfall through massively increased personal spending.Healthcare is the main example of that. Healthcare in the US is simply nuts and anyone from any other developed country would be paying significantly more for at best equivalent healthcare and probably worse care than in their home country. Even including the extra taxes to pay for universal healthcare back home, we’d come out behind in the US.Little to no holiday time. No point earning more money if you never have the time to spend it. In most EU countries including (for now) the UK, 24 days a year is the norm not including bank holidays and other national days. When I worked in France, I had 42 days a year - and national caricatures aside, the average productivity of a French worker is actually higher than their American counterpart,Fewer employment rights and employee protections. You’ve had 50 years of big business telling you that unions don’t work - despite the very visible and significant contributions that they have made to work safety and workers rights. As a result, there are no checks and balances to corporate greed and unfettered capitalism. Economic mobility (the chance to improve your situation through hard work and application - aka the ‘American Dream’) - is actually much lower in the US than in almost any other developed nation, and is far below the ‘socialist’ nations of Europe.A much less tolerant and far more polarised national discourse. The ‘left-wing’ Democratic party would be a solidly pro-business centre-right party anywhere outside of the US. About 40% of the country has the other 60% hostage to an immoral, unChristian, hateful and economically illiterate ideology. I have spent a lot of time in the US and I am a Nordic-looking white dude. Attitudes I encountered towards others made me severely uncomfortable. I have no desire to live in a country where a hate-filled minority continue to subjugate a majority through disenfranchisement, systemic harrassment and open bigotry.Everything is commercialised. Everything. Anything that can have an advertisement attached to it does so. One of the most famous tourist attractions in New York City, is a square where you can go to see a bewildering display of corporate advertising. Having somebody try to sell you something on every surface you can see is mentally exhausting and spiritually bankrupt.Guns. This is kind of a big one. In no other developed country in the world would I even think to consider what I’d do if an armed intruder crashed through my door, or if a random mugger on the way home held me up at gunpoint. The toxic obsession with murdertoys weakens your nation and makes it objectively less safe. Likewise, due to the Balkanised police system in the US, many officers are extremely poorly trained and should not be trusted with anything more dangerous than a radio. The way that many officers consider their gun to be the first rather than the last resort is why you currently have a problem with law-abiding citizens getting shot on the reg. Routine police use of firearms simply does not happen in other countries.Jingoism and false exceptionalism. The US cult of the military is deeply creepy (and I say that as a former service member myself). The idea that it is not possible to criticise the government’s foreign and domestic activities or protest symbols of the nation because of ‘disrespect for the troops’ is straight up Orwellian. Likewise, the often held ‘wisdom’ that common sense and practical solutions from other countries just wouldn’t work in the US is endemic in everything from healthcare to mass transit.I have had a number of great experiences in the US. There are a lot of breathtaking landscapes, wonderful cuisines, many warm and generous people, and a huge variety of world-class culture to enjoy. You could not pay me enough to live there however.