Activity 3.4.
-
Try it out by clicking on the “Run” button in the above window and verify that the same line is indeed printed 5-times.
-
Now modify the code so that it prints
Hello, World!10-times.
Section 3.4 Repetition: A Simple for-Loop
Suppose you wanted to print the same line of text five times. Here is one way to do so:
But imagine how many times you’d have to type the same line if you wanted to print it 100 times! Or imagine wanting to make a change to all of those lines, for example wanting two exclamation marks at the end of each output line. Here is a more elegant solution: a so-called loop:
Try it out right now by hitting that “Run” button!
C actually supports multiple types of loops. This one is called a
for-loop; we’ll learn about the other types of loops later. We will also soon learn more about the use of the rather mysterious-looking “i” and the line “int i;”. For now, just think of i as something that can hold different values. In this particular example, i takes on values between 1 and 5, and for each value of i between 1 and 5 this loop prints out Hello, World!. That is, Hello, World! is printed exactly 5-times.
You can place multiple statements into your loops:
