Loops (1)
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The document discusses different types of loops in programming including while, do-while, and for loops. A while loop repeatedly executes a block of code as long as a given condition is true. A do-while loop is similar but checks the condition after executing the code block. A for loop allows initialization of a counter variable, a condition to test each iteration, and an update to the counter variable between iterations. Examples are provided of each type of loop to illustrate their usage.
![Console.Write("n = ");
int n = int.Parse(Console.ReadLine());
Console.Write("m = ");
int m = int.Parse(Console.ReadLine());
int num = n;
long product = 1;
do
{
product *= num;
num++;
} while (num <= m);
Console.WriteLine("product[n...m] = " + product);](https://image.slidesharecdn.com/loops1-191118182121/85/Loops-1-9-320.jpg)
![n = 2
m = 6
product[n...m] = 720](https://image.slidesharecdn.com/loops1-191118182121/85/Loops-1-10-320.jpg)
Loops (1)
- 1. ENG : BASMA ROSHDY
- 2. In programming often requires repeated execution of a sequence of operations. A loop is a basic programming construct that allows repeated execution of a fragment of source code. Depending on the type of the loop, the code in it is repeated a fixed number of times or repeats until a given condition is true (exists).
- 3. One of the simplest and most commonly used loops is while. while (condition) } loop body; }
- 4. // Initialize the counter int counter = 0; // Execute the loop body while the loop condition holds while (counter <= 9) { // Print the counter value Console.WriteLine("Number : " + counter); // Increment the counter counter++; }
- 5. Number : 0 Number : 1 Number : 2 Number : 3 Number : 4 Number : 5 Number : 6 Number : 7 Number : 8 Number : 9
- 6. Console.Write("n = "); int n = int.Parse(Console.ReadLine()); int num = 1; int sum = 1; Console.Write("The sum 1"); while (num < n) { num++; sum += num; Console.Write(" + " + num); } Console.WriteLine(" = " + sum);
- 7. N = 17 The sum 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 = 153
- 8. The do-while loop is similar to the while loop, but it checks the condition after each execution of its loop body. This type of loops is called loops with condition at the end (post-test loop). A do-while loop looks like do { executable code; } while (condition);
- 9. Console.Write("n = "); int n = int.Parse(Console.ReadLine()); Console.Write("m = "); int m = int.Parse(Console.ReadLine()); int num = n; long product = 1; do { product *= num; num++; } while (num <= m); Console.WriteLine("product[n...m] = " + product);
- 10. n = 2 m = 6 product[n...m] = 720
- 11. Console.Write("n = "); int n = int.Parse(Console.ReadLine()); decimal factorial = 1; do { factorial *= n; n--; } while (n > 0); Console.WriteLine("n! = " + factorial);
- 12. For-loops are a slightly more complicated than while and do-while loops but on the other hand they can solve more complicated tasks with less code. Here is the scheme describing for-loops: for(int i=0;i<10;i++) { /*loopbody*/ }
- 13. for (initialization; condition; update) } loop's body; {
- 14. for (int num = 0; num < 10; num++) } // Loop body }
- 15. for (int i = 0; i <= 10; i++) } Console.Write(i + " "); { The result of its execution is the following: 0 1 2 3 4 5 6 7 8 9 10