C++ Without Fear, 3rd Edition

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• Author:Brian Overland
• Isbn:0134314301
• Year:2015
• Pages:619
• Language:English
• File size:23.39 MB
• File format:PDF
• Category:C & C++
• Book Description:
• Learning C++ Doesn’t Have to Be Difficult!
  

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关键词：without Edition editio dition withou 3rd Ed Without Fear

zhaosl 发表于 2016-10-3 10:50

Author:Brian Overland

Isbn:0134314301

Year:2015

谢谢分享

thanks for sharing。。。。

1. Example 4.1. Printing 1 to N with “for”
   
2. 
   
3. Now we’ll apply the for statement in a complete program. This example does the same thing as Example 2.2 on page 43: It prints all the numbers from 1 to n. But this version is more compact.
   
4. count2.cpp
   
5. Click here to view code image
   
6. 
   
7. #include <iostream>
   
8. using namespace std;
   
9. 
   
10. int main()
    
11. {
    
12.     int  n = 0;
    
13.     int  i = 0;   // Loop counter in "for" statement.
    
14. 
    
15.     // Get num from the keyboard and initialize i.
    
16. 
    
17.     cout << "Enter a number and press ENTER: ";
    
18.     cin >> n;
    
19.     for (i = 1; i <= n; ++i){   // For i = 1 to n
    
20.         cout << i << " ";       //    Print i.
    
21.     }
    
22.     return 0;
    
23. }

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1. #include <iostream>
   
2. #include <cmath>
   
3. 
   
4. using namespace std;
   
5. 
   
6. int main()
   
7. {
   
8.     int  n = 0;   // Number to test for prime-ness
   
9.     bool is_prime = true; // Boolean flag; assume true
   
10.                           //   until proven otherwise
    
11. 
    
12.     // Get a number from the keyboard.
    
13. 
    
14.     cout << "Enter a number and press ENTER: ";
    
15.     cin >> n;
    
16. 
    
17.     // Test for prime by checking for divisibility
    
18.     //  by all whole numbers from 2 to sqrt(n).
    
19. 
    
20.     for (int i = 2; i <= sqrt(n); ++i) {
    
21.         if (n % i == 0) {
    
22.             is_prime = false;
    
23.         }
    
24.     }
    
25. 
    
26.     // Print results
    
27. 
    
28.     if (is_prime) {
    
29.         cout << "Number is prime." << endl;
    
30.     } else {
    
31.         cout << "Number is not prime." << endl;
    
32.     }
    
33.     return 0;
    
34. }

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Example 4.2. Prime-Number Test with “for”

1. #include <iostream>
   
2. #include <cmath>
   
3. 
   
4. using namespace std;
   
5. 
   
6. int main()
   
7. {
   
8.     int  n = 0;   // Number to test for prime-ness
   
9.     bool is_prime = true; // Boolean flag; assume true
   
10.                           //   until proven otherwise
    
11. 
    
12.     // Get a number from the keyboard.
    
13. 
    
14.     cout << "Enter a number and press ENTER: ";
    
15.     cin >> n;
    
16. 
    
17.     // Test for prime by checking for divisibility
    
18.     //  by all whole numbers from 2 to sqrt(n).
    
19. 
    
20.     for (int i = 2; i <= sqrt(n); ++i) {
    
21.         if (n % i == 0) {
    
22.             is_prime = false;
    
23.         }
    
24.     }
    
25. 
    
26.     // Print results
    
27. 
    
28.     if (is_prime) {
    
29.         cout << "Number is prime." << endl;
    
30.     } else {
    
31.         cout << "Number is not prime." << endl;
    
32.     }
    
33.     return 0;
    
34. }

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1. Example 6.1. Print Out Elements
   
2. 
   
3. Let’s start by looking at one of the simplest programs possible that uses an array. The rest of the chapter gets into more interesting programming challenges.
   
4. print_arr.cpp
   
5. Click here to view code image
   
6. 
   
7. #include <iostream>
   
8. using namespace std;
   
9. 
   
10. int main()
    
11. {
    
12.     double scores[5] = {0.5, 1.5, 2.5, 3.5, 4.5};
    
13. 
    
14.     for(int i = 0; i < 5; ++i) {
    
15.         cout << scores[i] << "  ";
    
16.     }
    
17.     return 0;
    
18. }

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1. #include <iostream>
   
2. #include <cstdlib>
   
3. #include <ctime>
   
4. 
   
5. using namespace std;
   
6. 
   
7. int rand_0toN1(int n);
   
8. int hits[10];
   
9. 
   
10. int main()
    
11. {
    
12.     int n = 0;  // Number of trials; prompt from user
    
13.     int r = 0;  // Holds a random value
    
14. 
    
15.     srand(time(nullptr));   // Set seed for randomizing.
    
16. 
    
17.     cout << "Enter how many trials and press ENTER: ";
    
18.     cin >> n;
    
19. 
    
20.     // Run n trials. For each trial, get a num 0 to 9
    
21.     //  and then increment the corresponding element
    
22.     //  in the hits array.
    
23. 
    
24.     for (int i = 0; i < n; ++i) {
    
25.         r = rand_0toN1(10);
    
26.         ++hits[r];
    
27.     }
    
28. 
    
29.     // Print all elements in the hits array, along
    
30.     //  with ratio of hits to EXPECTED hits (n / 10).
    
31. 
    
32.     for (int i = 0; i < 10; ++i) {
    
33.        cout << i << ": " << hits[i] << " Accuracy: ";
    
34.        double results = hits[i];
    
35.        cout << results / (n / 10.0) << endl;
    
36.     }
    
37.     return 0;
    
38. }
    
39. 
    
40. // Random 0-to-N1 Function.
    
41. // Generate a random integer from 0 to N-1.
    
42. //
    
43. int rand_0toN1(int n) {
    
44.     return rand() % n;
    
45. }

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