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Therefore, if you want to run the above program yourself, make sure you’re using a release build configuration (see lesson 0.9 - Configuring your compiler: Build configurations for a reminder on how to do that). This will not happen when using a release build configuration. Some compilers, such as Visual Studio, will initialize the contents of memory to some preset value when you’re using a debug build configuration. Feel free to compile and run the program yourself (your computer won’t explode). When the author ran this program in Visual Studio, std::cout printed the value 7177728 one time, and 5277592 the next. But what value will it print? The answer is “who knows!”, and the answer may (or may not) change every time you run the program. It will then send the value residing in that memory location to std::cout, which will print the value (interpreted as an integer). In this case, the computer will assign some unused memory to x. Std::cout << x // who knows what we'll get, because x is uninitialized Int x // this variable is uninitialized because we haven't given it a value Consider the following short program: #include Using the values of uninitialized variables can lead to unexpected results. But this should always be done selectively and intentionally.
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Once you are more comfortable with the language, there may be certain cases where you omit the initialization for optimization purposes. If C++ initialized all of those variables with default values upon creation, this would result in 100,000 initializations (which would be slow), and for little benefit (since you’re overwriting those values anyway).įor now, you should always initialize your variables because the cost of doing so is miniscule compared to the benefit. In such case, you might create 100,000 variables, then fill them with data from the file. Imagine a case where you were going to read in 100,000 values from a file. This lack of initialization is a performance optimization inherited from C, back when computers were slow.