How many times will “Hello World” be printed?

by

Well you can introduce a counter to be sure

int counter = 0;
for (int i = 0; i < n; i++)
    for(int j = 0; j < i; j++)
    {
        printf("Hello World");
        counter  ++;
    }

Or take a pen :

i = 1  j = 0  Hello World
i = 2  j = 0  Hello World
       j = 1  Hello World
i = 3  j = 0  Hello World
       j = 1  Hello World
       j = 2  Hello World
i = 4  j = 0  Hello World
       j = 1  Hello World
       j = 2  Hello World
       j = 3  Hello World
[...]

And you can see a pattern… 1 + 2 + 3 + … ?

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