Slide 2.9

Introduction to QtCreator. Can show creating a new project, advertise
Qt as a cross platform frame- work (with many extension to c++),
mobile android/ios... games+applications.

/*
* hello.cpp
* This program prints a welcome message
* to the user.
*/
#include<iostream>
int main()
{
	std::cout << "Hello, world!" << std::endl;
	return 0;
}
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Slide 2.11:

Show the effect of return value (from terminal with $?)


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Slide 2.14:

Size of fundamental types on this machine. 
     
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Slide 2.16:

/*
 * main.cpp
 * This program introduces pointers and references.
 */
#include<iostream>

int main()
{
    int a[100];
    int* p= a;
    a[0]=12;
    std::cout << a[0] << " " << p[0] << std::endl;
       
    return 0;
}

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Slide 2.16:

Do some pointer arithmetic with p (set some more value in a);
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Slide 2.17:

show the similitude between “ int* const” and “int&”.

// int b = 10;
// int& r;
// int& r=b;

// std::cout << "r= " << r << ", b=" << b << ", p=" << p << std::endl;
// b = 12;
// std::cout << "r= " << r << ", b=" << b << ", p=" << p << std::endl;
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Slide 1.36:

show “using namespace std;”.

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Slide 2.31:

Show returning more than two values
void minmax (int a, int b, int& min, int& max)
{
...
}

Large object

struct t
{
	int a[100];
};

void this_does_copy(t v)
{
	std::cout << v.a << std::endl;
}

void this_does_not_copy(t& v)
{
	std::cout << v.a << std::endl;
}

intmain(int argc, char ∗∗argv)
{
 tt1;

 std::cout << t1.a << std::endl;

 this_does_copy(t1);

this_does_not_copy(t1);
}

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Slide 1.43:

Show the compilation error

void grow (const int& age) {
     age = age + 1 ;
}

int main ( ) {
    int age = 20 ;
    grow(age) ;
    return 0 ;
}
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Slide2.35
Show some string comparisons:

strings1= ”apa”;
strings2= ”apa”;

std::cout << (s1 > s2) << std::endl;

s1= ”apaw”;
s2= ”apa”;

std::cout << (s1 > s2) << std::endl;

s1 = ”apaw”;
s2 = ”apb”;
std::cout << (s1 > s2) << std::endl;
std::cout << (”apaw” > ”apa”) << std::endl;

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Slide2.35

const char* cstring= ”apa”;
std::string cppstring= cstring;
const char* othercstring= cppstring.cstr();

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Slide2.37
void printDouble(strings){
     cout << s*2 << endl;
}

voidappendFour(intn){
    cout << n+”4” << endl;
}

int main(){
    appendFour(2);
}

Then in appendFour replace “4” by “1234”

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Slide2.41

string name;
cout << ”Typeyourname:”;
cin >> name;
cout << ”Hello,” << name << endl;

Replace cin with “getline(cin,name);”