write a c program that reads a positive
时间: 2023-10-20 20:06:23 浏览: 39
integer n from the user and calculates the sum of all the positive integers from 1 to n.
#include <stdio.h>
int main() {
int n, sum = 0;
printf("Enter a positive integer: ");
scanf("%d", &n);
for (int i = 1; i <= n; i++) {
sum += i;
}
printf("The sum of all positive integers from 1 to %d is %d\n", n, sum);
return 0;
}
相关问题
Each hospital should have the same number of masks and gowns. Write a C++ program that reads all the data from the file and displays each hospital with the number of items that are needed to make the two numbers the same.
Here's an example program that reads the data from the "equipment.txt" file and displays each hospital with the number of items needed to make the number of masks and gowns the same:
```c++
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
using namespace std;
int main() {
ifstream file("equipment.txt");
string line;
// Read each line of the file
while (getline(file, line)) {
stringstream ss(line);
string hospital;
int masks, gowns;
// Parse the line into hospital name, number of masks, and number of gowns
getline(ss, hospital, ';');
ss >> masks;
ss.ignore();
ss >> gowns;
// Calculate the number of items needed to make masks and gowns the same
int diff = abs(masks - gowns);
int total = masks + gowns;
int needed = total / 2 - min(masks, gowns);
// Display the results
cout << hospital << ": Needs " << needed << " more of ";
if (masks < gowns) {
cout << "masks\n";
} else {
cout << "gowns\n";
}
}
// Close the file
file.close();
return 0;
}
```
In this program, we first create an object of the `ifstream` class named "file" and pass the name of the file we want to read from as an argument to the constructor.
Then, we read each line of the file using the `getline()` function and parse it into the hospital name, number of masks, and number of gowns using a `stringstream`.
Next, we calculate the number of items needed to make masks and gowns the same by finding the absolute difference between the two and dividing the total by 2, then subtracting the lower number of masks or gowns.
Finally, we display the results by printing the hospital name and the number of items needed to make the two numbers the same, along with whether more masks or gowns are needed.
Note that we use the `abs()` function to ensure that the difference between masks and gowns is always positive, regardless of which number is greater.
Write a program that reads an expression in a line as input and prints out the result. Only integers and operators below are allowed in the expression:
Sure, I can help you with that! Here is a Python code snippet that can evaluate simple arithmetic expressions containing only integers and the operators +, -, *, and /:
```python
expression = input("Enter an arithmetic expression: ")
result = eval(expression)
print("Result:", result)
```
You can copy and paste this code into a Python IDE or a Jupyter notebook and execute it. When prompted, enter an arithmetic expression like "2+3*4" and press Enter. The program will then evaluate the expression and print out the result, which in this case should be 14.
Note that the `eval()` function is used to evaluate the expression entered by the user as a Python expression. This means that the user can potentially enter any valid Python expression, so you should be careful when using this function in a production environment.