3.3. For Loops

Even though the while type of construct is very useful in a wide variety of situations, another iterative structure, the for statement, can be used to iterate across a range of values easily. A for statement allows us to write a loop that is executed a specific number of times.

#include <iostream> using namespace std; int main() { for (int i = 0; i < 10; i++){ cout << i << "hello world" << endl; } }

In the example above, the hello world statement is executed 10 times.

A common use of the for construct is to implement certain repetition over a range of values.

#include <iostream> using namespace std; // squares the numebers in range 5 // ex. 0*0, 1*1, 2*2 ... int main() { for (int i=0; i<5; i++) { cout << i*i << " "; } return 0; }

The code will use cout five times. The value of the variable i will start at 0 and go through the full sequence of values 0,1,2,3,4. This value is then squared and printed.

3.4. Check yourself

#include <iostream>
using namespace std;

int main() {

    for (int counter=0; counter<4; counter++) {
        cout << counter * 2 << " ";
    }

    return 0;
}

Q-3: Using the code above please select the answer that should appear?

• 0 2 4 6
• Good Job!
• 0 0 0 0
• Not quite, take another look at the operation happening in the cout line
• Runtime error
• Not quite, take another look at the for loop
• 0 1 2 3
• Not quite, take another look at the operation happening in the cout line
• all of the above

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