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Some Variations on the for Loop
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The for is one of the most versatile statements in the C# language because it allows a wide range of variations They are examined here
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Using Multiple Loop Control Variables
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The for loop allows you to use two or more variables to control the loop When using multiple loop control variables, the initialization and increment statements for each variable are separated by commas Here is an example:
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// Use commas in a for statement using System; class Comma { static void Main() { int i, j;
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Program Control Statements
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for(i=0, j=10; i < j; i++, j--) ConsoleWriteLine("i and j: " + i + " " + j); }
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PART I
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The output from the program is shown here:
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i i i i i and and and and and j: j: j: j: j: 0 1 2 3 4 10 9 8 7 6
Here, commas separate the two initialization statements and the two iteration expressions When the loop begins, both i and j are initialized Each time the loop repeats, i is incremented and j is decremented Multiple loop control variables are often convenient and can simplify certain algorithms You can have any number of initialization and iteration statements, but in practice, more than two make the for loop unwieldy Here is a practical use of multiple loop control variables in a for statement This program uses two loop control variables within a single for loop to find the largest and smallest factor of a number, in this case 100 Pay special attention to the termination condition It relies on both loop control variables
// Use commas in a for statement to find the largest and // smallest factor of a number using System; class Comma { static void Main() { int i, j; int smallest, largest; int num; num = 100; smallest = largest = 1; for(i=2, j=num/2; (i <= num/2) & (j >= 2); i++, j--) { if((smallest == 1) & ((num % i) == 0)) smallest = i; if((largest == 1) & ((num % j) == 0)) largest = j; } ConsoleWriteLine("Largest factor: " + largest); ConsoleWriteLine("Smallest factor: " + smallest); } }
Part I:
The C# Language
Here is the output from the program:
Largest factor: 50 Smallest factor: 2
Through the use of two loop control variables, a single for loop can find both the smallest and the largest factor of a number The control variable i is used to search for the smallest factor It is initially set to 2 and incremented until its value exceeds one half of num The control variable j is used to search for the largest factor Its value is initially set to one half the num and decremented until it is less than 2 The loop runs until both i and j are at their termination values When the loop ends, both factors will have been found
The Conditional Expression
The conditional expression controlling a for loop can be any valid expression that produces a bool result It does not need to involve the loop control variable For example, in the next program, the for loop is controlled by the value of done
// Loop condition can be any bool expression using System; class forDemo { static void Main() { int i, j; bool done = false; for(i=0, j=100; !done; i++, j--) { if(i*i >= j) done = true; ConsoleWriteLine("i, j: " + i + " " + j); } } }
The output is shown here:
i, i, i, i, i, i, i, i, i, i, i, j: j: j: j: j: j: j: j: j: j: j: 0 100 1 99 2 98 3 97 4 96 5 95 6 94 7 93 8 92 9 91 10 90
In this example, the for loop iterates until the bool variable done is true This variable is set to true inside the loop when i squared is greater than or equal to j
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