for arrays (which is what you want) or for single elements. But it’s more simple to use vector, or use smartpointers, then you don’t have to worry about memory management. L.data() gives you access to the int[] array buffer and you can L.resize() the vector later. L.get() gives you a pointer to the int[] array.
I am new in C++ , i just want to output my point number up to 2 digits. just like if number is 3.444, then the output should be 3.44 or if number is 99999.4234 then output should be 99999.42, How can i do that. the value is dynamic. Here is my code. but its … Read more
gcc and g++ are compiler-drivers of the GNU Compiler Collection (which was once upon a time just the GNU C Compiler). Even though they automatically determine which backends (cc1 cc1plus …) to call depending on the file-type, unless overridden with -x language, they have some differences. The probably most important difference in their defaults is … Read more
The reason why has to do with the type system. C/C++ doesn’t really support strings as a type. It does support the idea of a constant char array but it doesn’t really fully understand the notion of a string. In order to generate the code for a switch statement the compiler must understand what it … Read more
I’m not exactly sure what the problem is, as your example code has several errors and doesn’t really make it clear what you’re trying to do. But here’s how you add to a specific row of a 2D vector: Does this answer your question? If not, could you try to be more specific as to … Read more
There might be a best way (like using the portable cin.get()), but a good way doesn’t exist. A program that has done its job should quit and give its resources back to the computer. And yes, any usage of system() leads to unportable code, as the parameter is passed to the shell that owns your process. Having pausing-code in your source … Read more
t’s frowned upon because it’s a platform-specific hack that has nothing to do with actually learning programming, but instead to get around a feature of the IDE/OS – the console window launched from Visual Studio closes when the program has finished execution, and so the new user doesn’t get to see the output of his … Read more
There might be a best way (like using the portable cin.get()), but a good way doesn’t exist. A program that has done its job should quit and give its resources back to the computer. And yes, any usage of system() leads to unportable code, as the parameter is passed to the shell that owns your process. Having pausing-code in your source … Read more
It’s frowned upon because it’s a platform-specific hack that has nothing to do with actually learning programming, but instead to get around a feature of the IDE/OS – the console window launched from Visual Studio closes when the program has finished execution, and so the new user doesn’t get to see the output of his … Read more
std::string has a constructor for this: Note that this construct deep copies the character list at s and s should not be nullptr, or else behavior is undefined.