What a loop does is loops through the same piece of code over and over until it has gone through the code a certain number of times.
FOR loops
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#include <iostream.h> int main() { for (int i = 0; i <= 5; i++) { cout << i << endl; } return 0; } |
This will print 0 to 5 on the screen. It does this because it keeps
going over cout << i << endl; until
i = 5
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5 |
for (int i = 0; i <= 5; i++) |
First of all, the first time it is run it will set i to 0, then it will go to the next part after the semi-colon (i <=5) and this is saying keep looping through while i is less than or equal to 5 and the next part (i++) will add 1 to i every time it loops through so that i doesn’t stay the same the whole time.
Another example: WHILE loops
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#include <iostream.h> int main() { int x = 0; while (x <= 5) { cout << x << endl; x++; } return 0; } |
This example will do the same thing as for, but can be used for different things
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6 |
while (x <= 5) |
This is saying loop the code while x is less
than or equal to 5
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9 |
x++; |
This just adds one to x every time it goes
through.