C++ Articles - Page 532 of 586

The main() function in C and C++ is anentry point of a program from where the execution begins. And there are two common ways available to define the main function; int main() and void main(). In this following article we will learn the differences between these two in detail. The main() function is the same like other functions, which takes arguments and returns some value. A point to keep in mind is that the execution of a program always begins from the main() function. When a program runs, the operating system calls the main() and the value returned from it ... Read More

Let us see how to generate different random numbers using C++. Here we are generating random numbers in range 0 to some value. (In this program the max value is 100).To perform this operation we are using the srand() function. This is in the C++ library. The function void srand(unsigned int seed) seeds the random number generator used by the function rand.The declaration of srand() is like below −void srand(unsigned int seed)It takes a parameter called seed. This is an integer value to be used as seed by the pseudo-random number generator algorithm. This function returns nothing.To get the number ... Read More

In this article we will check whether a double or floating point number is NaN (Not a Number) in C++. Checking if a Double or Floating Point Number is NaN To check, we can utilise the isnan() method. The isnan() function is available in the cmath library. This function was introduced in C++ version 11. So From C++11 next, we can use this function. The isnan() function is used to determine whether a double or floating point number is not-a-number (NaN) value. Return true if num is NaN, false otherwise. C++ Program to Check Double or Float Number is NaN ... Read More

In this article, we will see how to generate the assembler output from C or C++ code using GCC. What is GCC The GCC, which stands for GNU Compiler Collection, is a set of compilers and development tools available for various operating systems such as Linux, Windows, and a wide variety of other OSs (operating systems). It supports mostly C and C++, but also Objective-C, Ada, Go, Fortran, and D. The Free Software Foundation (FSF) created GCC and distributed it as totally free (as in libre) software. How to Get Assembler Output The GCC has a great feature that allows ... Read More

In C++, when we pass multiple arguments to a function, a common question arises, in what order are these arguments evaluated? Is it from left to right, right to left, or does it depend on the compiler? In this article, we will learn how function parameter evaluation works in C++, why the order of evaluation is important, and how it can vary across different compilers. Is the Order of Evaluation Defined in C++? The C++ standard does not guarantee a fixed order of evaluation for function arguments. This means compilers are free to evaluate arguments from left to ... Read More

It is possible to pass some values from the command line to your C++ programs when they are executed. These values are called command line arguments and many times they are important for your program especially when you want to control your program from outside instead of hard-coding those values inside the code.The command line arguments are handled using main() function arguments where argc refers to the number of arguments passed, and argv[] is a pointer array which points to each argument passed to the program. Following is a simple example which checks if there is any argument supplied from ... Read More

In C/C++, the expression c = a++ + b indicates that the current value of a is added to b, and the result is assigned to c. After this assignment, a is incremented by 1 (post-increment), which means the increment of a happens after its value is used in the expression. Well, let a and b initialize with 2 and 5, respectively. This expression can be taken as two different types. c = (a++) + b c = a + (++b) The above two expressions contain both post and pre-increment ... Read More

The effective result of i++ and ++i are same. The only difference is that the i++ increases the value of i after assigning it, and for ++i, it increases the value first, then assigns its value. We can see the difference in the following code.Example Code#include using namespace std; int main() {    int x = 3, y, z;    y = x++;    z = ++x;    cout

Let us see how to generate random numbers using C++. Here we are generating a random number in range 0 to some value. (In this program the max value is 100).To perform this operation we are using the srand() function. This is in the C library. The function void srand(unsigned int seed) seeds the random number generator used by the function rand.The declaration of srand() is like below:void srand(unsigned int seed)It takes a parameter called seed. This is an integer value to be used as seed by the pseudo-random number generator algorithm. This function returns nothing.To get the number we ... Read More

The Pi is a special mathematical value, approximately 3.14159, that is often used in calculations related to circles and geometry. In C++, we need to understand how to access and use this constant in our programs. In this article, we will show how to use the PI constant in a C++ program. The PI constant is available in the cmath header file. We will explain how to use PI to calculate values like the area or circumference of a circle. How to Use Pi in C++ There are multiple ways to use the Pi constant in C++. ... Read More