Converting string to ASCII
cin >> plainText reads from the input up to, but excluding, the first whitespace character. You probably want std::getline(cin, plainText) instead. References: std::getline istream& operator>> (istream& is, string& str)
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Stack around the variable ‘ ‘ was corrupted
location is an array of a single char.There is no location[1].ShareImprove this answer Follow answered Feb 27 ’11 at 21:00 SLaks 825k171171 gold badges18511851 silver badges19261926 bronze badges Add a comment 7 You are prompting the memory address of location array to your user. You should ask location indices separately: Notice int location[2]; since an … Read more
Including .cpp files
What include does is copying all the contents from the file (which is the argument inside the <> or the “” ), so when the preproccesor finishes its work main.cpp will look like: So foo will be defined in main.cpp, but a definition also exists in foop.cpp, so the compiler “gets confused” because of the function duplication.
Converting from Radians to Degrees
You want to calculate radians=tan(y/x) first. Then you can convert it to degrees: See the reference here for atan: On a side note, you also have to take into account what quadrant you are in to get the correct answer (since -y/x is the same number as y/-x)
stoi function gives error: std::invalid_argument at memory location 0x0035E8D8. c++
As from the reference documentation, std::stoi() must be expected to throw these exceptions: Exceptions std::invalid_argument if no conversion could be performed std::out_of_range if the converted value would fall out of the range of the result type or if the underlying function (std::strtol or std::strtoll) sets errno to ERANGE. Thus this exception depends on your actual input, which you’re currently not disclosing from your question (unfortunately).
How to memset char array with null terminating character?
Options one and two are just wrong. The first one uses the size of a pointer instead of the size of the array, so it probably won’t write to the whole array. The second uses sizeof(char*) instead of sizeof(char) so it will write past the end of the array. Option 3 is okay. You could also use this but sizeof(char) is … Read more
How to change string into QString?
If by string you mean std::string you can do it with this method: QString QString::fromStdString(const std::string & str) If by string you mean Ascii encoded const char * then you can use this method: QString QString::fromAscii(const char * str, int size = -1) If you have const char * encoded with system encoding that can be read with QTextCodec::codecForLocale() then you should use … Read more
In c++ what does a tilde “~” before a function name signify?
It’s the destructor, it destroys the instance, frees up memory, etc. etc. Here’s a description from ibm.com: Destructors are usually used to deallocate memory and do other cleanup for a class object and its class members when the object is destroyed. A destructor is called for a class object when that object passes out of … Read more
When is it safe to call this-> in constructor and destructor
Within any non-static member function, this points to the object that the function was called on. It’s safe to use as long as that’s a valid object. Within the body of a constructor or destructor, there is a valid object of the class currently being constructed. However, if this is the base sub-object of some … Read more
how to convert from int to char*?
In C++17, use std::to_chars as: std::array<char, 10> str; std::to_chars(str.data(), str.data() + str.size(), 42); In C++11, use std::to_string as: std::string s = std::to_string(number); char const *pchar = s.c_str(); //use char const* as target type And in C++03, what you’re doing is just fine, except use const as: char const* pchar = temp_str.c_str(); //dont use cast