The sane way to approach it would be to develop a 3rd party library and make it available over the internet through open source, Github etc. The GNU C dialect is one such example, which is a collection of non-standard compiler extensions used by the GCC compiler. One could join the GCC open source group … Read more
You have a member function: void func_A(int a, T initvalue = T()) {} that can be called like this: mc.func_A(1); Then you have an overloaded member function: void func_A(int a) {} that can also be called like this: mc.func_A(1); How could the compiler know which function you intend to call by that line? Answer: It … Read more
I think you should be comparing the string WITHIN the struct. Username[i].usernameadmin == username This would compare string username with string usernameadmin. The == operator can be used to compare strings in C++, thanks to overloading. You can still use .compare as well. Username[i].usernameadmin.compare(username) 10 solved How to compare a string with a struct (which … Read more
Ad 1. You’ve been bitten by the most vexing parse. Basically, C++ grammar causes ambiguities between statements and declarations in certain cases. In such cases, the input is interpreted as a declaration. Since int i() can be interpreted as an integer variable definition, or a function declaration, it is interpreted as a declaration of parameterless … Read more
Defining a constructor that takes a const char* as parameter and a copy constructor should do it. Having a copy constructor there also means you’d need a copy assignment operator and a destructor. You should also decide whether your objects assume ownership of the strings. In your example – a.value = “Hello, “; – just … Read more
In string literals, the “\” slash is the escape character. In order for your string literal to work properly you need to escape each “\” with the “\”. In other words, replace each “\” with two slashes like so: inFile.open(“C:\\Users\\Muhammad Shaeel\\Desktop\\CC\\Lexical Analyser Code\\Lexical Analyser Code\\program.txt”); solved Program fails to open file
You don’t have to add (Double) there, why indeed. You are converting 50.2 to int wich evaluates to 50, then you are converting 50 back to double wich stays at 50 If you print it. The only reason i can think to do this is If it’s inside some function with a return double value … Read more
I am not sure what you are asking, But the following program meets your conditions, 1. there is array of pointers 2. there is malloc 3. there is no character array #include <stdio.h> #include <stdlib.h> #define STR_MAX_SIZE 256 int main() { char *str; char *pos[2]; char c; if((str = malloc(STR_MAX_SIZE)) ==NULL) { return -1; } … Read more
The body of an if-statement can be either a compound statement, which is a list of statements surrounded by {}, or it is the single statement following the if‘s condition. That means that this code: if(n>=2) cout<<“number of times the function called: “<<endl; return n*factorial(n-1); is completely equivalent to: if(n>=2){ cout<<“number of times the function … Read more
If you’ll do it often, define a stream operator for your struct, then loop over them (see it live on Coliru): #include <iostream> struct PlayerState { char name[20]; int level; int year; double health; int experience; }; std::ostream& operator<< ( std::ostream& os, const PlayerState& state ) { os << state.name << “: ” << state.level … Read more
The underlying problem here is that you don’t know in advance how many integers are going to come in, so you can’t use that for loop — there’s no sensible value for numbers. Instead, keep reading values until the end of the input: while (std::cin >> i) sum += i; When the attempted read eventually … Read more
Why not the getpid() method defined in unistd.h? #include <unistd.h> int main(){ int pid = getpid(); int parentsPID = getppid(); return 0; } 1 solved How to find the PID of a C code during compilation time? [closed]
I think just you need to check the value of your textbox first cause you can`t convert null value to Double if (textBox1.Text!=””) { m = kilometer * Convert.ToDouble(textBox1.Text);//here is the problem textBox2.Text = m.ToString(); } or give textBox1 initial value before start calculation, Note: If you use number Regex for TextBox1 this will be … Read more
this part: cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); cmd.Dispose(); cmd = null; db.Close(); db.Open(); SqlDataReader DR; DR = cmd.ExecuteReader(); why do you execute a non query, which is a query (select * from …)? why do you dispose the SqlCommand object cmd and why do you reuse it after disposing? why do you close and open the line below? … Read more
This code works fine for a right angled triangle – * ** *** But I guess you want a triangle like this – * *** ***** Try this – #include <iostream> using namespace std; int main() { int i, j, k, n; cout << “Please enter number of rows you want to see: \n”; cin … Read more