Chapter 2: Problem 34

Write a complete \(\mathrm{C}_{+}+\) program that outputs the numbers 1 to 20 , one per line. The program does nothing else.

Short Answer

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### Short Answer To create a simple C++ program that outputs the numbers 1 to 20, one per line, a loop that iterates 20 times and an output statement are needed. The loop must be implemented using a "for" loop to set an initialization statement, a condition, and an update statement. The iostream library should be included, and the main function should be defined. Inside the main function, the "for" loop should be created with a variable that iterates from 1 to 20. Then, the program should output the current value of the variable followed by a newline character using "cout." The final code should look like this: ```cpp #include using namespace std; int main() { for (int i = 1; i <= 20; ++i) { cout << i << endl; } return 0; } ```

Step by step solution

Include necessary headers

To start with, we need to include the standard input-output library, i.e., "iostream," which provides us with the necessary functions for printing output. Moreover, we need to use the "std" namespace to avoid writing "std::" before every standard library function or class. To include the necessary headers: ```cpp #include using namespace std; ```

Define the main function

Now, we need to define the main function, which is the entry point of any C++ program. Here's how to define the main function: ```cpp int main() { } ```

Implement the loop that prints numbers 1 to 20

Inside the main function, we'll implement a loop that iterates 20 times. For this, we can use the "for" loop, which takes three arguments: an initialization statement, a condition, and an update statement. We'll initialize a variable "i" with the value 1, set the condition for continuation as "i <= 20," and update the variable by incrementing it in each iteration. Within the loop, we'll print the current value of "i" followed by a newline character to achieve the desired output. Here's how to implement this: ```cpp for (int i = 1; i <= 20; ++i) { cout << i << endl; } ```

Complete the program

Finally, put all the code snippets together to create the complete C++ program. This is how the final program should look: ```cpp #include using namespace std; int main() { for (int i = 1; i <= 20; ++i) { cout << i << endl; } return 0; } ``` This program will output the numbers 1 to 20, one per line, as required by the exercise.

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Write a complete \(\mathrm{C}_{+}+\) program that outputs the numbers 1 to 20 , one per line. The program does nothing else.

Short Answer

Step by step solution

Include necessary headers

Define the main function

Implement the loop that prints numbers 1 to 20

Complete the program

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