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# Lec7 - Lecture 7 do while loops for loops an example...

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Lecture 7 do while and for loops 1 Lecture 7 do - while loops for loops an example – greenhouse gas We will use the unary operator += frequently in this lecture. If you don’t remember what it is, go back to Lecture 4, Slide 7. Review: a+=b is the same as a=a+b

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Lecture 7 do while and for loops 2 do - while loops do - while loops always execute once while loops do not have to execute once Syntax do { statements; statements; update criteria; }while(criteria check); Simple example Sum a series of numbers Initial term in series is 0.0 Increment is 0.25 Final term in series is 3.0 0 . 3 ... 75 . 0 50 . 0 25 . 0 + + + + = y
Lecture 7 do while and for loops 3 #include<iostream.h> void main() { double dx, xmax, x, y; dx = 0.25; xmax = 3.0; y = 0.0; x=0.0; Notice that I have put more than one statement on a line. cout << "\n \n x = "<<x; cout << "\n \n y = "<<y; cout << endl; } do { y += x; x += dx; }while (x<=xmax); The do statements are done once before the while check is done. Note that I still have to update my loop criteria (in this case the value of x) What will the value of x be when exiting the loop?

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• Spring '07
• x
• CO2 emissions, Examples Page

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