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for (;;) { cout <<"Enter int: "; cin >>n; if (n%2==0) continue; else if (n%3==0) break; cout <<" Loop Bottom.\n"; } cout <<" Outside Loop.\n";
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Enter int: 7 Loop Bottom Enter int: 4 Enter int: 9 Outside loop
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When n is 7, both of the if conditions fail and control reaches the bottom of the loop. When n is 4, the first if condition is true, so control skips over the rest of the statements in the loop and jumps to the top of the loop to continue with the next iteration. When n is 9, the first if condition is false but the second is true, so control breaks out of the loop and jumps to the first statement that follows the loop. The goto Statement The break statement, the continue statement, and the switch statement cause the control of the program to branch to a location other than where it normally would go. The destination of the branch is determined by the context: break goes to the next statement outside the loop, continue goes to the loop's continue condition, and switch goes to the correct case constant. All three of these statements are called jump statements because they cause the control of the program to "jump over" other statements. The goto statement is another kind of jump statement. Its destination is specified by a label within the statement. A label is simply an identifier followed by a colon, placed before a statement. Labels work like the case statements inside a switch statement: they specify the destination of the jump. Example 3.9 Breaking Out of Nested Loops This fragment illustrates the correct way to break out of nested loops. for (int i=0; i<a; i++) { for (int j=0; j<b; j++) for (int k=0; k<c; k++)
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if (i*j*k>100) goto esc; else cout <<i*j*k <<" "; esc: cout <<endl; }
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When the goto is reached inside the innermost loop, program control jumps out to the output statement at the bottom of the outermost loop. Another way to break out is to use a ''done flag'' within the continue conditions of the for loops like this: int done=0; for (int i=0; i<a && !done; i++) { for (int j=0; j<b && !done; j++) for (int k=0; k<c && !done; k++) if (i*j*k>100) done=1; else cout <<i*j*k << " " } This avoids the use of a goto but is a bit artificial and cumbersome.
Caution! The overuse of goto statements often produces unstructured spaghetti code that is difficult to debug, so limit your use of the goto statements to terminating deeply nested loops.
Constants, Variables, and Objects An object is a contiguous region of memory that has an address, a size, a type, and a value. The address of an object is the memory address of its first byte. The size of an object is simply the number of bytes that it occupies. The value of an object is determined by the actual bits stored in its memory location and by the object's type that prescribes how those bits are to be interpreted. The type of an object is determined by the programmer. The value of an object may be determined by the programmer at compile time or at run-time. An object's size is determined by the compiler and its address is determined by the computer's operating system at run-time.
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Some objects do not have names. We will see examples of such anonymous objects later. A variable is an object that has a name. The word "variable" is used to suggest that the object's value can be changed. An object whose value cannot be changed is called a constant. Constants are declared by preceding the type specifier with the keyword const. Constants must be initialized when they are declared. The following program fragment illustrates constant definitions: const char BEEP='\b'; const int MAXINT=2147483647; int n=MAXINT/2; const double PI=3.14159265358979323846; Constants are usually defined for values that will be used more than once in a program but not changed. It is customary to use all capital letters in constant identifiers to distinguish them from other kinds of identifiers. A good compiler will replace each constant symbol with its numeric value.
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