Class Warm‑Up#

For today’s class warm up, you will be applying concepts learned about C++ yesterday and comparing code and behavior to Python. Write your answers on the class Google Presentation

  1. What is the difference between a C++ executable and a Python script? Define what each is and how they are created. What is the difference in the way you run each?

  1. Consider the two code blocks below. First, try to predict what will happen in each. After you make a prediction, try running each one to observe the behavior. Write your observations in the class Google presentation. Are there any differences?

name = "Dr. Nash"

for i in range(3):
    name = "Dr. Pritchard"
    print("Inside loop:", name)
print("Outside loop:", name)

#include <iostream>
#include <string>

int main() {

    std::string name = "Dr. Nash";

    for (int i = 0; i < 3; i++) {
        std::string name = "Dr. Pritchard";
        std::cout << "Inside loop: " << name << std::endl;
    }
    std::cout << "Outside loop: " << name << std::endl; 
    return 0;
}

  1. Consider the two code blocks below. First, try to predict what will happen in each. After you make a prediction, try running each one to observe the behavior. Write your observations in the class Google presentation. Are there any differences?

for i in range(3):
    name = "Dr. Pritchard"
    print("Inside loop:", name)
print("Outside loop:", name)

#include <iostream>
#include <string>

int main() {
    for (int i = 0; i < 3; i++) {
        std::string name = "Dr. Pritchard";
        std::cout << "Inside loop: " << name << std::endl;
    }
    std::cout << "Outside loop: " << name << std::endl; 
    return 0;
}

  1. Each code block below has an error on the last line. Try running each code block and observe how long it takes for an error to occur. If you observe a difference, give a reason based on the difference between how Python and C++ run.

s = 0
for i in range(100000000):  # long loop
    s += i

print(result)  # intentional error: NameError (result is undefined)

#include <iostream>

int main() {

    long long s = 0; //this is an integer data type for large numbers.
    for (long long i = 0; i < 100000000; ++i) {
        s += i;
    }

    std::cout << s << std::endl // <-- intentional error: missing semicolon

    return 0;
}

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