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As you can see, this loop has no body and no need for one either Time delay loops are sometimes useful The following code shows how to create one by using for:
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for(t=0; t < SOME_VALUE; t++) ;
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The second iteration statement 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 loops until A is pressed:
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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 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 at all 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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/* 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 */
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l++; THE FOUNDATION OF C++ } s[l] = }
'\0';
/* strings need to be terminated in a null */
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 In cases in which any one of several separate conditions can terminate a while loop, often a single loop-control variable forms the conditional expression In this example
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
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do-while
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 sequence } while(condition); Although the curly braces are not necessary when only one statement is present, they are usually used to improve readability and avoid confusion (to you, not the compiler) with the while This do-while loop will read numbers from the keyboard until it finds a number less than or equal to 100:
do { scanf("%d", &num); } while(num > 100);
Perhaps the most common use of the do-while is in a menu selection function When the user enters a valid response, it is returned as the value of the function Invalid responses cause a reprompt The following code shows an improved version of the spelling-checker menu shown earlier in this chapter:
void menu(void) { char ch; printf("1 Check Spelling\n"); printf("2 Correct Spelling Errors\n"); printf("3 Display Spelling Errors\n"); printf(" Enter your choice: "); do { ch = getche(); /* read the selection from the keyboard */ switch(ch) { case '1': check_spelling(); break; case '2': correct_errors();
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