How to Show Highest and Lowest number

[tetsuuuu]

Hello, I was wondering how to print out the users highest grade and lowest grade after the loop ends. Also if you can please provide a description of how to do it please do so. I am a beginner and lots of these concepts are still very confusing to me, so any help is much appreciated.

#include<iostream>
using namespace std;
int main()
{int numGrades;
 double grade = 0, sum = 0, average;
 
 cout << "\nHow many grades do you have? ";
 cin >> numGrades;
 cout << "\nList your grades: " << endl;
 
 for(int i = 1; i <= numGrades; i++){
 cout << "Grade " << i << endl;
 cin >> grade;
 sum += grade;	
 }
 
 average = sum / numGrades;
 cout<< "\n Your average is = "<< average;
 




	
cout << "\n\n";
return 0;	
}

[Ganado]

pseudo code:

highest_grade = -1; // some initial low number

each loop:
    if the current grade is higher than the highest_grade,
        set the highest_grade to be the current grade

print highest_grade

[tetsuuuu]

Something like

Output:

"Your average is = "

"Your highest grade is = "

"Your lowest grade is = "

at the end

[Ganado]

Yes, so just as you have a variable for average, you're going to need to declare two more variables, one for highest grade, one for lowest grade.

[tetsuuuu]

I seemed to get the maximum working, but the minimum doesnt.

#include<iostream>
using namespace std;
int main()
{int numGrades, max = -1, min;
 double grade = 0, sum = 0, average;
 
 cout << "\nHow many grades do you have? ";
 cin >> numGrades;
 cout << "\nList your grades: " << endl;
 
 for(int i = 1; i <= numGrades; i++){
 cout << "Grade " << i << endl;
 cin >> grade;
 sum += grade;
 if( max < grade){
 	max = grade	;
 	}
 else if( grade < min){
 	min = grade ;
 	}
 }
 
 average = sum / numGrades;
 cout<< "\nYour average is = "<< average;
 cout<< "\nYour highest grade is = "<< max
 	 << "\nYour lowest grade is = "<< min;
 
 	
cout << "\n\n";
return 0;	
}

[Ganado]

You never initialized min to a proper value before comparing it.
Turn on compiler warnings (-Wall in GCC).

 In function 'int main()':
26:40: warning: 'min' may be used uninitialized in this function [-Wmaybe-uninitialized]

Normally you would set min to either initially be an invalid value, really big value, or if you want to be extra safe,

#include <limits>

// ...

int min = std::numeric_limits<int>::max();

[tetsuuuu]

Okay got it. How would I make sure the user inputs a number 100 or below? edit: or actually between 0 and 100 only

#include<iostream>
using namespace std;
int main()
{int numGrades, max = -1, min = 101;
 double grade = 0, sum = 0, average;
 
 cout << "\nHow many grades do you have? ";
 cin >> numGrades;
 cout << "\nList your grades: " << endl;
 
 for(int i = 1; i <= numGrades; i++){
 cout << "Grade " << i << endl;
 cin >> grade;
 sum += grade;
 if( max < grade){
 	max = grade	;
 	}
 else if( grade < min){
 	min = grade ;
 	}
 }
 
 average = sum / numGrades;
 cout<< "\nYour average is = "<< average;
 cout<< "\nYour highest grade is = "<< max
 	 << "\nYour lowest grade is = "<< min;
 
 	
cout << "\n\n";
return 0;	
}

[Ganado]

Simplest option would be to check that the conditions you want are true after line 8 (after input is received).

If it's not true, then either loop until it is true, or return early from the function.