Chapter 5: Problem 61

include using namespace std; int main () \\{ int count $=1,$ total; while $(\operatorname{count} < =1… # // This program displays the sum of the numbers $1-100$ # include using namespace std; int main () \\{ int count $=1,$ total; while $(\operatorname{count} < =100)$ total $+=$ count cout $ < < $ "The sum of the numbers $1-100$ is "; cout $ < < $ total $ < < $ endl return 0; \\}

Short Answer

Expert verified

Question: Explain the given C++ program that calculates the sum of numbers from 1 to 100, discussing the purpose of each section of the code. Answer: The given C++ program comprises four main sections: 1. Header files and the main function: The program includes the header to perform input and output operations and has the main function where the program execution starts. The 'using namespace std' directive allows the use of 'cout' and 'endl' without specifying 'std::' as a prefix. 2. Variable Initialization: Two integer variables, 'count' and 'total', are declared. 'count' is initialized with the value 1, while 'total' remains uninitialized. 3. while loop: A while loop is used to iterate through numbers from 1 to 100, incrementing 'count' at each step. Inside the loop, 'total' accumulates the sum of the numbers. 4. Output and program termination: The program outputs the result of the sum using 'cout' and 'endl' for readability. The program ends with 'return 0', indicating a successful execution.

Step by step solution

Understand the program's goal

The program's goal is to calculate the sum of numbers from 1 to 100 and display the result.

Analyze the code structure

The given code comprises of the following sections: 1. Header files and the main function: The program includes the header, which is necessary to perform input and output operations. The main function is where the program execution starts. 2. Variable Initialization: The variable 'count' is initialized to 1, and 'total' remains uninitialized. 3. while loop: This section uses a while loop to iterate through numbers 1 to 100, incrementing 'count' at each iteration. Inside the loop, 'total' accumulates the sum of the numbers. 4. Output and program termination: Finally, the program outputs the result of the sum and ends with 'return 0'.

Explanation of the code

Let's break down and explain each part of the code. 1. Header files and the main function ```cpp #include using namespace std; int main() ``` The code starts by including the library to perform input and output operations. 'using namespace std' enables the use of 'cout' and 'endl' without having to specify 'std::' as a prefix. The main function is where the code execution starts. 2. Variable Initialization ```cpp int count =1, total; ``` Here, two variables 'count' and 'total' are declared as integers. 'count' is initialized with the value 1, while 'total' has not been initialized. 3. while loop ```cpp while (count <= 100) { total += count; count++; } ``` The while loop will run as long as the 'count' is less than or equal to 100. Inside the loop, 'total' will be updated by adding the value of 'count' to it. Then, 'count' will be incremented by 1. This process continues until 'count' becomes greater than 100. 4. Output and program termination ```cpp cout << "The sum of the numbers 1-100 is "; cout << total << endl; return 0; ``` The result ('total') is displayed on the screen using 'cout'. 'endl' is used to insert a newline character, making the output more readable. The program ends with 'return 0', which indicates that the execution was successful.

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Short Answer

Step by step solution

Understand the program's goal

Analyze the code structure

Explanation of the code

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