Basics and data types¶

Here is the basic structure for a C++ application. If you're developing locally, you'll start with just a main function, but this step is unnecesary in a notebook environment.

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#include <iostream>
#include <string>

int main(){
    double x = static_cast<int>(5.5);
    std::string y = "Hello world";

    std::cout << x << std::endl;
    std::cout << y << std::endl;
}

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main();

Here's how to print a variable¶

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int v = 5000;
std::cout << v << std::endl;

You can use variables defined in earlier cells:

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std::cout << x << std::endl;

Working with strings¶

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#include <stdio.h>

char name[30];
scanf("%29s", name);
printf("Hello %s", name);

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#include <string>
#include <iostream>

std::string name = "Caleb";
std::cout << name.size() << std::endl;

name += " Curry";

std::cout << name << std::endl;

char you[] = "Subscriber";
std::cout << you << " is " << strlen(you) << " characters long" << std::endl;

//you += " forever"; //NOPE

std::string copy1 = name;

std::cout << copy1 << std::endl;

char copy2[11];
strcpy(copy2, you);

std::cout << copy2 << std::endl;

std::cin >> name;
std::cout << name;

5
Caleb Curry
Subscriber is 10 characters long
Caleb Curry
Subscriber

Tacos