user to enter the student’s marks on four exams (use double and one exam is over 20). The Write a program that asks the program should display the four exam’s marks, the sum and the average.(Use also the header file iomanip)
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To write a program that asks the user to enter the student's marks on four exams, calculates the sum and average, and displays the results, you can follow these steps:
1. Include the necessary header files to use doubles and iomanip:
```cpp
#include <iostream>
#include <iomanip>
```
2. Declare the variables for the four exam's marks, sum, and average:
```cpp
double exam1, exam2, exam3, exam4, sum, average;
```
3. Ask the user to input the marks for each exam:
```cpp
std::cout << "Enter the marks for Exam 1: ";
std::cin >> exam1;
std::cout << "Enter the marks for Exam 2: ";
std::cin >> exam2;
std::cout << "Enter the marks for Exam 3: ";
std::cin >> exam3;
std::cout << "Enter the marks for Exam 4: ";
std::cin >> exam4;
```
4. Calculate the sum of the exam marks:
```cpp
sum = exam1 + exam2 + exam3 + exam4;
```
5. Calculate the average of the exam marks:
```cpp
average = sum / 4;
```
6. Display the exam marks, sum, and average using iomanip to format the output:
```cpp
std::cout << "Exam 1: " << std::fixed << std::setprecision(2) << exam1 << std::endl;
std::cout << "Exam 2: " << std::fixed << std::setprecision(2) << exam2 << std::endl;
std::cout << "Exam 3: " << std::fixed << std::setprecision(2) << exam3 << std::endl;
std::cout << "Exam 4: " << std::fixed << std::setprecision(2) << exam4 << std::endl;
std::cout << "Sum: " << std::fixed << std::setprecision(2) << sum << std::endl;
std::cout << "Average: " << std::fixed << std::setprecision(2) << average << std::endl;
```
Putting it all together, the complete program looks like this:
```cpp
#include <iostream>
#include <iomanip>
int main() {
double exam1, exam2, exam3, exam4, sum, average;
std::cout << "Enter the marks for Exam 1: ";
std::cin >> exam1;
std::cout << "Enter the marks for Exam 2: ";
std::cin >> exam2;
std::cout << "Enter the marks for Exam 3: ";
std::cin >> exam3;
std::cout << "Enter the marks for Exam 4: ";
std::cin >> exam4;
sum = exam1 + exam2 + exam3 + exam4;
average = sum / 4;
std::cout << "Exam 1: " << std::fixed << std::setprecision(2) << exam1 << std::endl;
std::cout << "Exam 2: " << std::fixed << std::setprecision(2) << exam2 << std::endl;
std::cout << "Exam 3: " << std::fixed << std::setprecision(2) << exam3 << std::endl;
std::cout << "Exam 4: " << std::fixed << std::setprecision(2) << exam4 << std::endl;
std::cout << "Sum: " << std::fixed << std::setprecision(2) << sum << std::endl;
std::cout << "Average: " << std::fixed << std::setprecision(2) << average << std::endl;
return 0;
}
```
This program prompts the user to enter marks for each exam, calculates the sum and average, and then displays them using formatting provided by the iomanip header.