cpp-puzzle

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Why "using namespace std" is considered bad practice

Last Updated: 31 August 2021

The statement using namespace std is generally considered bad practice. The alternative to this statement is to specify the namespace to which the identifier belongs using ...read more

cpp-namespaces

cpp-puzzle

C++

Print system time in C++ (3 different ways)

Last Updated: 10 December 2018

First MethodPrinting current date and time using time()Second Method[sourcecode language="CPP"]// CPP program to print current date and time// using time and ctime.#includ ...read more

cpp-puzzle

C++

date-time-program

Measure execution time of a function in C++

Last Updated: 03 May 2023

We can find out the time taken by different parts of a program by using the std::chrono library introduced in C++ 11. We have discussed at How to measure time taken by a p ...read more

CPP-Library

cpp-puzzle

C++

C/C++ Tricky Programs

Last Updated: 18 April 2023

We may come across various tricky programs in our day-to-day life. Maybe in technical interviews, coding tests, or C/C++ classrooms.Here is a list of such programs:-Print ...read more

Execute both if and else statements in C/C++ simultaneously

Last Updated: 13 September 2023

Write a C/C++ program that executes both if-else block statements simultaneously.Syntax of if-else statement in C/C++ language is:if (Boolean expression){ // Statement ...read more

How to check whether a number is in the range[low, high] using one comparison ?

Last Updated: 22 June 2022

This is simple, but interesting programming puzzle. Given three integers, low, high and x such that high = low. How to check if x lies in range [low, high] or not using si ...read more

cpp-puzzle

C Language

C++

Write a C program that won't compile in C++

Last Updated: 22 November 2021

Although C++ is designed to have backward compatibility with C, there can be many C programs that would produce compiler errors when compiled with a C++ compiler. Followin ...read more

cpp-puzzle

C Language

C++

Write a C program that does not terminate when Ctrl+C is pressed

Last Updated: 21 June 2022

Write a C program that doesn't terminate when Ctrl+C is pressed. It prints a message "Cannot be terminated using Ctrl+c" and continues execution. We can use signal handlin ...read more

How to measure time taken by a function in C?

Last Updated: 21 June 2022

To calculate time taken by a process, we can use clock() function which is available time.h. We can call the clock function at the beginning and end of the code for which ...read more

cpp-puzzle

C Language

C++

What happens when a function is called before its declaration in C?

Last Updated: 24 December 2021

In C, if a function is called before its declaration, the compiler assumes the return type of the function as int.For example, the following program fails in the compilati ...read more

cpp-puzzle

C Language

C-Functions

Program for Sum of the digits of a given number

Last Updated: 05 December 2022

Given a number, find the sum of its digits.Examples :Input: n = 687Output: 21Input: n = 12Output: 3Recommended PracticeSum Of DigitsTry It!Follow the below steps to solve ...read more

How will you print numbers from 1 to 100 without using a loop?

Last Updated: 11 September 2023

If we take a look at this problem carefully, we can see that the idea of "loop" is to track some counter value, e.g., "i = 0" till "i = 100". So, if we aren't allowed to u ...read more

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