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3.6 THE goto
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STATEMENT
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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 got0 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, either at the beginning of a statement. Labels work like the case statements inside a switch statement: they specify the destination of the jump.
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ITERATION AND FLOATING TYPES
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EXAMPLE 3.11 Breaking Out of Nested Loops
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This program illustrates the correct way to break out of nested loops.
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main0 int a, b, c; tin >> a >> b >> c; for (int i = 0; i c a; i++) { for (int j = 0; j < b; j++> for (int k = 0; k c c; k++) if (i*j*k > 100) goto esc; else tout CC i*j*k CC ' "; esc: tout -CC endl; 1 1
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When the goto is reached inside the innermost loop 9 program control j umps out to the output statement at the bottom of the outermost loop There are other ways to achieve this nested loop exit. One way would be to reset the loop ables by replacing the i f statement inside the k-loop with
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if (i*j*k > 100) j = k = b + else tout CC i*j*k << ' ";
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This will cause both the j -loop and the k-loop to terminate because their continue conditions, j < b and k < c, will be false. This is a hacker s method because it artificially sets the values of the control variables j and k to achieve the desired outcome as a side eflect.
Another approach 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; if (i*j*k > 100) done = 1; else tout C-C i*j*k CC ' "; 1
k++)
But this too is somewhat artificial and cumbersome. The go to is really the best way to terminate nested loops.
It is easy to overuse the got0 statement, as the next example illustrates.
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ITERATION AND FLOATING TYPES
EXAMPLE 3.12 Overusing got o Statements This nonsense program shows how the use of got o statements can lead to spaghetti code :
main0 1 int n; tout << "Enter n: "; tin >> n; sl: tout c-c Now at step - -w if (n c 2) return 0; s2: tout cc "Now at step if (n < 7) got0 s4; s3: tout cc "Now at step if (n % 2 == 0) got0 s4: tout << "Now at step n -= 2; if (n > 4) got0 sl; else got0 s3;
1 with n = ' CC n cc endl;
2 with n = ' cc n cc endl; 3 with n = ' CC n cc endl; sl; 4 with n = ' c-c n -c-c endl;
A s n decreases from 9 to 2, the go to statements send program control back and forth among the four output statements labelled s 1, s 2, s 3, and s 4:
The imprudent use of go tos leads to unstructured spaghetti code which is difficult to debug.
ITERATION
FLOATING
TYPES
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3.7 REAL NUMBER TYPES C++ supports three real number types: float, double, and long double. On most systems, double uses twice as many bytes as float. Typically, float uses 4 bytes, double uses 8 bytes, and long double uses 8, 10, 12, or 16 bytes. Types that are used for real numbers are called floating-point types because of the way they are stored internally in the computer. On most systems, a number like 123.45 is first converted to binary form: 123.45 = 1111011.01110011~ Then the point is floated so that all the bits are on its right. In this example, the floating-point form is obtained by floating the point 7 bits to the left, producing a mantissa 27 times smaller. So the original number is
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