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Enter coefficients of quadratic equation: 2 1 -6 The equation is: 2x^2 + 1x + -6 = 0 The solutions are: 1.5, -2 Enter coefficients of quadratic equation: 1 4 5 The equation is: 1x^2 + 4x + 5 = 0 This equation has no real solutions: d < 0 Enter coefficients of quadratic equation: 0 4 5 This is not a quadratic equation: a == 0 Note how we use the return statement inside the selection statements to terminate the program if either a is zero or d is negative. The alternative would have been to use an else clause in each if statement. This program prints the sum of the digits of the given integer: int main() { int n, sum; cout << "Enter a six-digit integer: "; cin >> n; sum = n%10 + n/10%10 + n/100%10 + n/1000%10 + n/10000%10 + n/100000; cout << "The sum of the digits of " << n << " is " << sum <<endl; } Enter a six-digit integer: 876543 The sum of the digits of 876543 is 33 A corrected version of Example 3.17 on page 47: int main() { // reports the user's grade for a given test score: int score; cout << "Enter your test score: "; cin >> score; if (score > 100 || score < 0) cout << "Error: that score is out of range.\n"; else switch (score/10) { case 10: case 9: cout << "Your grade is an A.\n"; break; case 8: cout << "Your grade is a B.\n"; break; case 7: cout << "Your grade is a C.\n"; break; case 6: cout << "Your grade is a D.\n"; break; default: cout << "Your grade is an F.\n"; break; } cout << "Goodbye." << endl; } Enter your test score: 103 Error: that score is out of range. Goodbye. Enter your test score: 93 Your grade is an A. Goodbye. Enter your test score: -3 Error: that score is out of range. Goodbye.
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Iteration is the repetition of a statement or block of statements in a program. C++ has three iteration statements: the while statement, the do..while statement, and the for statement. Iteration statements are also called loops because of their cyclic nature. 4.1 THE while STATEMENT The syntax for the while statement is
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where condition is an integral expression and statement is any executable statement. If the value of the expression is zero (meaning false ) then the statement is ignored and program execution immediately jumps to the next statement that follows the while statement. If the value of the expression is nonzero (meaning true ) then the statement is executed repeatedly until the expression evaluates to zero. Note that the condition must be enclosed by parentheses. EXAMPLE 4.1 Using a while Loop to Compute a Sum of Consecutive Integers
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This program computes the sum 1 + 2 + 3 + + n, for an input integer n: int main() { int n, i=1; cout << "Enter a positive integer: "; cin >> n; long sum=0; while (i <= n) sum += i++; cout << "The sum of the first " << n << " integers is " << sum; } i sum This program uses three local variables: n, i, and sum. Each time the while loop 0 0 iterates, i is incremented and then added to sum. The loop stops when i = n, so n is the last 1 1 2 3 value added to sum. The trace at right shows the values of i and sum on each iteration after 3 6 the user input 8 for n. The output for this run is 4 10 Enter a positive integer: 8 5 15 The sum of the first 8 integers is 36 6 21 The program computed 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 = 36. 7 28 8 36 On the second run the user inputs 100 for n, so the while loop iterated 100 times to compute the sum 1 + 2 + 3 + + 98 + 99 + 100 = 5050: Enter a positive integer: 100 The sum of the first 100 integers is 5050
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Note that the statement inside the loop is indented. This convention makes the program s logic easier to follow, especially in large programs. 60
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