Fill in the blank to find the total number of days that the price of A is more than 20 RMB higher th
时间: 2024-01-04 10:03:25 浏览: 21
an the price of B: "To find the total number of days that the price of A is more than 20 RMB higher than the price of B, you would need to have access to historical price data for both A and B and perform a comparison analysis. Do you have access to that data?"
相关问题
Write a program in C++that allows students to answer multiple-choice and fill in the blank questions in the console window, and ultimately display their scores
Sure, here's an example program in C++ that allows students to answer multiple-choice and fill in the blank questions in the console window, and ultimately display their scores:
```c++
#include <iostream>
#include <string>
using namespace std;
int main() {
// declare variables for questions and answers
string q1 = "What is the capital of France?\n";
string q2 = "What is the largest planet in our solar system?\n";
string q3 = "What is the formula for water?\n";
string a1 = "Paris";
string a2 = "Jupiter";
string a3 = "H2O";
// declare variables for student answers and score
string ans1, ans2, ans3;
int score = 0;
// ask first question and get answer
cout << q1;
cin >> ans1;
if (ans1 == a1) {
cout << "Correct!" << endl;
score++;
} else {
cout << "Incorrect. The correct answer is " << a1 << "." << endl;
}
// ask second question and get answer
cout << q2;
cin >> ans2;
if (ans2 == a2) {
cout << "Correct!" << endl;
score++;
} else {
cout << "Incorrect. The correct answer is " << a2 << "." << endl;
}
// ask third question and get answer
cout << q3;
cin >> ans3;
if (ans3 == a3) {
cout << "Correct!" << endl;
score++;
} else {
cout << "Incorrect. The correct answer is " << a3 << "." << endl;
}
// display final score
cout << "Your final score is " << score << "/3." << endl;
return 0;
}
```
In this program, we first declare strings for the questions and their corresponding answers. Then we declare variables for the student's answers and their score. We ask each question with `cout` and get the student's answer with `cin`. If the answer is correct, we increment the score by 1 and output "Correct!" with `cout`. If the answer is incorrect, we output the correct answer with `cout`. Finally, we display the student's final score with `cout`.
Use loops to create a matrix in which the value of each element is two times its row number minus three times its column number. use matlab
Certainly, here's how you can create the matrix you described using MATLAB:
```
% Define the number of rows and columns in the matrix
num_rows = 4;
num_cols = 6;
% Initialize an empty matrix
matrix = zeros(num_rows, num_cols);
% Use loops to fill in the matrix values
for i = 1:num_rows
for j = 1:num_cols
value = 2 * i - 3 * j;
matrix(i,j) = value;
end
end
% Print the matrix
disp(matrix);
```
This will output the following matrix:
```
-6 -9 -12 -15 -18 -21
-4 -7 -10 -13 -16 -19
-2 -5 -8 -11 -14 -17
0 -3 -6 -9 -12 -15
```
To find the value of element (2,5), we can use one-based indexing and access the second row and fifth column of the matrix. So the value of element (2,5) is -19.