The while Loop in Visual Studio .NET

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The while Loop
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The second loop available in C/C++ is the while loop Its general form is while(condition) statement; where statement is either an empty statement, a single statement, or a block of statements The condition may be any expression, and true is any nonzero value The loop iterates while the condition is true When the condition becomes false, program control passes to the line of code immediately following the loop The following example shows a keyboard input routine that simply loops until the user types A:
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char wait_for_char(void) { char ch; ch = '\0'; /* initialize ch */ while(ch != 'A') ch = getchar(); return ch; }
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First, ch is initialized to null As a local variable, its value is not known when wait_for_char( ) is executed The while loop then checks to see if ch is not equal to A Because ch was initialized to null, the test is true and the loop begins Each time you press a key, the condition is tested again Once you enter an A, the condition becomes false because ch equals A, and the loop terminates Like for loops, while loops check the test condition at the top of the loop, which means that the body of the loop will not execute if the condition is false to begin with This feature may eliminate the need to perform a separate conditional test before the loop The pad( ) function provides a good illustration of this It adds spaces to the end of a string to fill the string to a predefined length If the string is already at the desired length, no spaces are added
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#include <stdioh> #include <stringh> void pad(char *s, int length); int main(void) { char str[80]; strcpy(str, "this is a test"); pad(str, 40); printf("%d", strlen(str)); return 0; } /* Add spaces to the end of a string */ void pad(char *s, int length) { int l; l = strlen(s); /* find out how long it is */ while(l<length) { s[l] = ' '; /* insert a space */ l++; } s[l]= '\0'; /* strings need to be terminated in a null */ }
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The two arguments of pad( ) are s, a pointer to the string to lengthen, and length, the number of characters that s should have If the length of string s is already equal to or greater than length, the code inside the while loop does not execute If s is shorter than length, pad( ) adds the required number of spaces The strlen( ) function, part of the standard library, returns the length of the string If several separate conditions need to terminate a while loop, a single variable commonly forms the conditional expression The value of this variable is set at various points throughout the loop In this example,
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void func1(void) { int working; working = 1; /* ie, true */ while(working) { working = process1(); if(working) working = process2(); if(working) working = process3(); } }
any of the three routines may return false and cause the loop to exit There need not be any statements in the body of the while loop For example,
while((ch=getchar()) != 'A') ;
will simply loop until the user types A If you feel uncomfortable putting the assignment inside the while conditional expression, remember that the equal sign is just an operator that evaluates to the value of the right-hand operand
The do-while Loop
Unlike for and while loops, which test the loop condition at the top of the loop, the do-while loop checks its condition at the bottom of the loop This means that a do-while loop always executes at least once The general form of the do-while loop is do { statement; } while(condition);
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