Rounding and converting to integer.. gahh

[justinc978]

Ok so I'm in a programming 1 class working with c++. I have the following assignment:

Write a C++ program that:
asks for and accepts the Percentage earned with as a double (i.e. 75.45)
rounds it to an integer (>= .5 rounds up, <.5 rounds down.)
prints the original Percentage and the corresponding Grade and Points exactly as shown below.
prints an error message for any input that is less than 0 or greater than 100.

For example, if user enters 89.4, the program prints out:
Percentage: 89.4% Grade: B Points: 3.00
You must use an if-else statement to do this in your program.
Use fixed and precision output manipulators (see Ch. 3) to display the values with the exact precision shown above.

IMPORTANT:
Each if statement condition should contain only one comparison! read this again
This means code that is similar to this is NOT okay:  if (Percentage >= 80.00 && Percentage <90.00)
This code is not acceptable because the if statement condition above has two comparisons.
(Hint: If you order your if-else chain statements correctly, you will only need one comparison in each.)

I have the program working, but I'm pretty sure I'm not rounding how my professor would like it to. This is my code:

#include <iostream>
#include <cmath>
#include <iomanip>

using namespace std;

int main()
{
	double percentage;
//	char grade;
	
	
	cout <<setiosflags(ios::fixed)<<setprecision(2)<< "What is the percentage of your grade?\n";
	cin>> percentage;

	
	
if (percentage <= 60){

cout << "Your grade is:F\t"<<"Your percentage is:"<<fixed<<percentage<<"\t"<<"Points: 0";
}
else if (percentage <= 69){

cout << "Your grade is: D\t"<<"Your percentage is:"<<fixed<<percentage<<"\t"<<"Points:1.00";
}
else if (percentage <=79){

cout << "Your grade is: C\t"<<"Your percentage is:"<<fixed<<percentage<<"\t"<<"Points:2.00";
}
else if (percentage <= 89){

cout << "Your grade is: B\t"<<"Your percentage is:"<<fixed<<percentage<<"\t"<<"Points:3.00";
}
else if(percentage >=90){

cout << "Your grade is:A\t"<<"Your percentage is:"<<fixed<<percentage<<"\t"<<"Points:4.00";
}
else{

cout<< "Invalid grade.";
}
}
	

So my issue here is the rounding, and then theres the converting the double percetnage to an integer. In my next assignment I have to write the program with a switch statement. And I'm struggling to figure out how to do this correctly. Any feedback will be much appreciated!

[MiiNiPaa]

So my issue here is the rounding, and then theres the converting the double percetnage to an integer.

#include <cmath>
//...
int perc = std::round(percentage);

[justinc978]

Hmm I get the error round is not a member of std. Because my professor is requiring it to be accepted percentage as a double, then convert it to an integer, I don't think an assignment expression will be acceptable.. gah I'm so confused on how to achieve this

cout <<setiosflags(ios::fixed)<<std::round(percentage)<< "What is the percentage of your grade?\n";

[justinc978]

Figured it out. So simple lol... Thanks for the input

int perc = round(percentage);