C# Control Statements, For loop, Do While.ppt
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The document provides an overview of control statements in C#, including selection structures like if and switch, as well as repetition structures like while loops. It explains various programming techniques such as controlled entry and exit from modules, avoiding goto statements, and using nested ifs for conditional logic. Additionally, it covers type conversion, particularly in arithmetic operations, and offers examples for implementing these concepts in C#.
![Nested control statements
See example of a multiplication table generation
class MultiplicationTable{
static void Main(string[] args){
int i=2, j, k;
while (i <= 12){
for (j = 1; j <= 10; j++){
Console.WriteLine(i + " x " + j + " = " + i * j );
}
Console.WriteLine("n");
i++;
}
}
}
}](https://image.slidesharecdn.com/ccontrolstatements-240419035014-caedf438/85/C-Control-Statements-For-loop-Do-While-ppt-11-320.jpg)
C# Control Statements, For loop, Do While.ppt
- 2. Control statements Linear (sequential) program execution Selection structure and repetition structure Structured programming ◦ Controlled entry and exit out of a module. ◦ Avoid goto statements
- 3. Selection structures in C# if single selection statement if…else double selection statement switch multiple – selection statement
- 4. Examples: if (grade >= 60) Console.writeline(“Passed!”); If (grade >=0) Console.writeline(“Passed!”); else Console.writeline(“Failed!”); Conditional Operator Console.writeline(grade >= 60 ?“Passed!” : “Failed!”);
- 5. Nested if (grade >=90) Console.writeline(“A”); else if (grade >=80) Console.writeline(“B!”); … else Console.writeline(“F!”);
- 6. Repetiton Structure - while While (condition){ statement 1; statement 2; statement 3; … }
- 7. Example length = Convert.ToInt16(Console.ReadLine()); while (length > 0) { Console.Write("Enter Height of the Wall: "); height = Convert.ToInt16(Console.ReadLine()); PaintAWall thisWall = new PaintAWall(length, height, pricePerGal); thisWall.CalculateCost(ref paintCost,ref laborCost,ref galPaint, ref sqFt); Console.Write("Enter Length and Height for Wall # : “ + Convert.ToString(numWalls+1)); Console.Write("nEnter Length of the Wall (0 to quit): "); length = Convert.ToInt16(Console.ReadLine()); }
- 8. Counter controlled vs Sentinel controlled A while loop, use LCV as a counter Counter =1 While (counter <=10) { … Counter ++ }//does it 10 times Sentinel controlled is good when one does not know exact number of times to execute a loop
- 9. Explicitly and Implicitly converting between simple types Integer and integer division yields integer result. Suppose average is a floating point number: Average = total/num. Average will only get an integer if total and num are integers. int sum = 200, num = 3; float average; average = sum / num; Console.WriteLine(average); Will print 66
- 10. Unary Cast Operator int sum = 200, num = 3; float av; av = (float) sum / num; Console.WriteLine(av); Will print 66.6666 Float/float or float/int or int/float will yield a float. C# implicitly promotes the one int to float.
- 11. Nested control statements See example of a multiplication table generation class MultiplicationTable{ static void Main(string[] args){ int i=2, j, k; while (i <= 12){ for (j = 1; j <= 10; j++){ Console.WriteLine(i + " x " + j + " = " + i * j ); } Console.WriteLine("n"); i++; } } } }
- 12. Switch Statements Switch (expression) { case value1: //Statements break; case value 2: //Statements break; case value 3: //Statements case value n: //Statements break; default: //Statements }