[SOLVED] What's happened with my cout<< ?

[cout Eureka]

Hello Qt World !

Is there somebody can explane at me why the display is different ? It's very strange !
@#include <iostream>

int add(int & a)
{
a += 1;
return a;
}

void enUneLigne();
void enPlusieursLignes();

int main()
{
std::cout << "en une ligne:" << std::endl;
enUneLigne();
std::cout << std::endl << std::endl << "en plusieurs lignes:" << std::endl;
enPlusieursLignes();
return 0;
}

void enUneLigne()
{
int a(0);

std::cout <<
"1: " << add(a) << std::endl <<
"2: " << add(a) << std::endl <<
"3: " << add(a) << std::endl <<
"4: " << add(a) << std::endl;

}
void enPlusieursLignes()
{
int a(0);

std::cout << "1: " << add(a) << std::endl;
std::cout << "2: " << add(a) << std::endl;
std::cout << "3: " << add(a) << std::endl;
std::cout << "4: " << add(a) << std::endl;

}
@

the display :

@Démarrage de \QT Projects_Essai4\debug_Essai4.exe...en une ligne:
1: 4
2: 3
3: 2
4: 1

en plusieurs lignes:
1: 1
2: 2
3: 3
4: 4
\QT Projects_Essai4\debug_Essai4.exe a quitté avec le code 0@

[VRonin]

This has nothing to do with Qt. the fact is just that C and C++ execute commands "from right to left" so the first function that is called in the enUneLigne() function is the one related to the fourth line of the text

[cout Eureka]

thank you for your response !

Have a nice evening.