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If you have the choice between a for loop and a while or do..while loop, you should probably use the for loop. As the next example illustrates, a for loop is usually easier to understand. Example 3.3 The Factorial Function Again Compare this program with the one in Ex. 3.2: void main() { int n, f=1; cout <<"Enter a positive integer: "; cin >>n; for (int i=2; i <= n; i++) f *= i; cout <<n <<" factorial is "<<f <<endl; } This computes the factorial by multiplying 1 by the factors 2, 3,..., n-i, n. It won't run any faster than the version done with the while loop, but the code is more succinct. It is customary to localize the declaration of the control ratable in the initialization pan of a for loop. For example, the control ratable i in the program above is declared to be an int within the initialization part int i=l. This is a nice feature of C++. However, once the control ratable is declared this way, it should not be redeclared in a later for loop. For example, for (int i=0; i<100; i++) sum += i*i; for (int i=0; i<100; i++) cout <<i; // ERROR The same control variable can be used again; it just cannot be redeclared in the same block. Example 3.4 The Extreme Values in a Sequence This program reads a sequence of positive integers, terminated by a 0. It then prints the smallest and largest numbers in the sequence. void main( ) { int n, min, max; cout <<"Enter >0 ints.\nTerminate with 0\n"; cin >>n; for (min=max=n; n>0; ) { if (n<min) min=n; //min-max are smallest else if (n>max) max=n; //& largest of the n cin >>n; // read so far } cout <<"min = " <<min <<"\nmax = " <<max <<endl; }
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Enter >0 ints. Terminate with 0 55 22 88 66 0 min = 22 max = 88
Notice that the initialization part of the for loop min=max=n is the equivalent of two assignments, and the update part is empty. 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. Example 3.5 More than One Control Variable This shows how a for loop may use more than one control variable: void main() { for (int m=l, n=8; m<n; m++, n-) cout <<"m = " <<m <<", n = " <<n <<endl; } 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. The break Statement We have already seen the break statement used in the switch statement. It is also used to terminate a loop. Example 3.6 Breaking Out of an Infinite Loop This while loop is equivalent to the one in Ex. 3.2: while (1) { if (i>n) break; sum += i*i; i++; } // loop stops here when i>n
As long as (i<=n), the loop will continue. As soon as (i>n), the break statement executes, immediately terminating the loop. Example 3.7 Controlling Input with a Sentinel This program reads a sequence of positive integers, terminated by 0, and prints their average:
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void main() { int n, count=0, sum=0; cout <<"Enter >0 ints.\nTerminate with 0\n"; for (; ; ) { cout <<"\t" <<count + 1 <<": "; cin >>n; if (n==O) break; ++count; sum += n; } cout <<"Average is " <<float(sum)/count <<endl; } Enter >0 ints. Terminate with 0 1:7 2:4 3:5 4:2 5:0 Average is 4.5
When 0 is input, the break executes and terminates the for loop causing 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. The continue Statement The break statement skips the rest of the statements in the loop and goes to the 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 to begin the next iteration.
Example 3.8 Using continue and break Statements This program fragment illustrates the continue and break statements:
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