1. (30 points) Grading system 90 and above, display \"A\" 80 to 89, display \"B\

Question

1. (30 points) Grading system 90 and above, display "A" 80 to 89, display "B" 70 to 79, display "C 60 to 69, display "D" 59 and below, display , 2. (30 points) Write a program using while(cin>x to get several integer numbers, calculate the average and display the result on the screen. 3. (40 points) Write a program using while (cin>>x) to get several float numbers, calculate the average and display the result on the screen. Use setprecision to display two digits after decimal point. (Hint: std:cout

Explanation / Answer

#include <iostream>

using namespace std;

int main()
{
int grade;
cout<<"Enter the grade: "<<endl;
cin >> grade;
if(grade >= 90) {
cout<<"A"<<endl;
} else if(grade >=80 && grade < 90) {
cout<<"B"<<endl;
} else if(grade >=70 && grade < 80) {
cout<<"C"<<endl;
} else if(grade >=60 && grade < 70) {
cout<<"D"<<endl;
} else {
cout<<"F"<<endl;
}
return 0;
}

Output:

#include <iostream>

using namespace std;

int main()
{
int x, sum = 0, count = 0;
cout<<"Enter the numbers (- 1 to quit): "<<endl;
cin >> x;
while(x!= -1) {
count++;
sum+=x;
cin >> x;
}
cout<<"Sum: "<<sum<<endl;
cout<<"Average: "<<(sum/(double)count)<<endl;
return 0;
}

Output:

#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
float x, sum = 0;
int count = 0;
cout<<"Enter the numbers (- 1 to quit): "<<endl;
cin >> x;
while(x!= -1) {
count++;
sum+=x;
cin >> x;
}
cout<<fixed<<setprecision(2)<<"Sum: "<<sum<<endl;
cout<<fixed<<setprecision(2)<<"Average: "<<(sum/count)<<endl;
return 0;
}

Output:

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