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ITERATION AND FLOATING TYPES
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Notice that the initialization part of the for loop min = max = n is the equivalent of two assignments, and the update part is empty. Also notice the use of the in-line comment that spans three lines. It describes a loop invariant, a condition on the variables that should be true on every iteration of the loop.
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A sentinel is a special value of an input variable that is used to terminate the input loop. In the example above, the value 0 is used as a sentinel.
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EXAMPLE 3.7 More than One Control Variable
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This program shows how a for loop may use more than one control variable:
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main0 { for (int m = 1, n = 8; m < n; m++, n--) tout -CC "m = 'I << m << ', n = ' << n -CC endl;
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m =. 2, n = 8 ,.
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m=Z,n=7
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m=3,n=5
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. ..,._ ., m = 4, 32 ="5 The initialization part of the for loop declares the two control variables m and n, initializing m to 1 and n to 8. The update part uses the comma operator to include two update expressions: m+ + and n- -. The loop continues as long as m < n. (Note that the comma in the initialization part of the for loop is not the comma operator; it is used there as part of an initialization list.)
3.4 THE b r e a k STATEMENT
We have already seen the break statement used in the switch statement. It is also used in loops. When it executes, it terminates the loop, breaking out of the iteration at that point.
EXAMPLE 3.8 Breaking Out of an Infinite Loop
This whi le loop is equivalent to the one in Example 3.2..
while (1) { if (i > n) break; sum += i*i;
1++;
// loop stops here when i > n
As long as (i <= n ) , the loop will continue, just as in Example 3.2. But as soon as break statement executes, immediately terminating the loop.
(i > n ) , t h e
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EXAMPLE 3.9 Controlling Input with a Sentinel
This program reads a sequence of positive integers, terminated by 0, and prints their average:
main0 int n, count = 0, sum = 0; Terminate input with O:\n"; tout << "Enter positive integers. for ( ; ; > -I tout << " \Y << count + 1 << ': '; tin >> n; if (n == 0) break; ++count; sum += n; tout << "The average of the ' << count << ' numbers is ' << float(sum')/count << endl;
When 0 is input, the break executes, which immediately terminating the for loop and causes the final output statement to execute. Without the use of the break here, the + + count statement would have to be put in a conditional or count would have to be decremented outside the loop or initialized to -1.
Notice that all three control parts of this for loop are empty: for ( ; ; ) . This construct is pronounced forever. Without the presence of the break, this would be an infinite loop.
3.5 THE continue STATEMENT
The break statement jumps over all the rest of the statements in the loop s block and goes to the next statement after the loop. The continue statement does the same thing except that, instead of terminating the loop, it goes back to the beginning of the loop s block to begin the next iteration.
CHAP. 31
ITERATION AND FLOATING TYPES
EXAMPLE3.10 Using continue and break Stzitements -----
This little program illustrates the continue and break statements:
main0 int n; for (;;I{ tin >> n; tout <-=+ "Enter int: 'I; if (n%2 == 0) continue; if (n%3 == 0) break; tout -c-c "\tBottom of loop.\n"; 1 "\tOutside of loop.\n";
J tout <<
Enter int: 7 Bottam of zoop. Enter int: 4
Enter int: 9 Outside of -Loop,
When n has the value 7, both of the if conditions fail and control reaches the bottom of the loop. When n has the value 4, the first if condition is true (4 is a multiple of 2), so control skips over the rest of the statements in the loop and jumps immediately to the top of the loop again to continue with the next iteration. When n has the value 9, the first if condition is false (9 is not a multiple of 2) but the second i f condition is true (9 is a multiple of 3), so control breaks out of the loop and jumps immediately to the first statement that follows the loop.
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