C++ Programing - Student Program with if statement, loops and histogram

HI, Im a beginner in C++, I was wondering if anyone could help me in the assignment? I need to make a code which would do the following;
- get the marks from the user,
-add them into the categories ( 0-25, 30-39, 40-69, 70-100)
and i know that i need to make to a loop either a for or while.
- and finally display them into a histogram,

I have roughly made a pseudo code:

Read in the marks

get the first mark

WHILE mark <= 100

Add the mark to the category

if mark is between 0 and 29
Add 1 to category1 counter
if mark is between 30 and 39
Add 1 to category2 counter

Count the number of marks

Get the next mark

Count the number of marks

Display a histogram of all the categories

display the range “0-29 “
FOR each mark in category1
Display a ‘*’

Display the total number of students




I would be very grateful for the help I'll receive from your comment. Thank you

Given the things I read between the lines you need to start with a hello world. From there it's a small step to set up some kind of data structure to store the results. Further, let the user put in new results.

Keep us posted.

@uberfuzz this is my code so far, but it still does not work, can you help me out here ? thanks

Code:

---

#include <iostream>
using namespace std;
int _main ()


{
        int mark = 0;  // Marks
        int cat_1 = 0;
        int cat_2 = 0;
        int cat_3 = 0;
        int cat_4 = 0;


        cout << "Please enter the marks the student has achived" << endl;
        cin >> mark;


                int i;
                i = 0;
                while (i<=10) {
               
                                cout << i << endl;
                                i++;
                        cout << "works!!!" << endl;


        if ((mark >=0) && (mark <=25))
        cout << "cat_1";


else if ((mark >=30) && (mark <=39))
        cout << "cat_2";


else if ((mark >=40) && (mark <=69))
                cout << "cat_3";


else if ((mark >=70) && (mark <=100))
        cout << "cat_4";
}
                        return 0;
}

---

@uberfuzz this is my code so far, but it still does not work, can you help me out here ? thanks

Code:

---

---

Code:

---

#include <iostream>
using namespace std;
int _main ()


{
        int mark = 0;  // Marks
        int cat_1 = 0;
        int cat_2 = 0;
        int cat_3 = 0;
        int cat_4 = 0;


        cout << "Please enter the marks the student has achived" << endl;
        cin >> mark;


                int i;
                i = 0;
                while (i<=10) {
               
                                cout << i << endl;
                                i++;
                        cout << "works!!!" << endl;


        if ((mark >=0) && (mark <=25))
        cout << "cat_1";


else if ((mark >=30) && (mark <=39))
        cout << "cat_2";


else if ((mark >=40) && (mark <=69))
                cout << "cat_3";


else if ((mark >=70) && (mark <=100))
        cout << "cat_4";
}
                        return 0;
}

---

Maybe you want to increment the counters of the category inside the loop. Do not forget to use brackets.

Also every time you post do not forget to state why you are not happy with your code ;)

in your code, what happens to values of mark between 26 and 29?

Code:

---

if ((mark >=0) && (mark <=25))   
            cout << "cat_1";

---

This does nothing to update the integer variables, this only displays "cat_1" on the screen. Instead, increment the variables with:

Code:

---

if((mark>=0) && (mark<=25))
            cat_1 = cat_1 + 1;

---

OR

Code:

---

if((mark>=0) && (mark<=25))
            cat_1++;

---

I'm not sure what the question is asking exactly as I feel you may have left out a few details, but if you were asked to create it in such a way that allows the user to input an indefinite amount of marks, use a do while loop instead.

Code:

---


#include <iostream>
using namespace std;

int main ()   
{
    int mark = 0;  // Marks
    int cat_1 = 0;
    int cat_2 = 0;
    int cat_3 = 0;
    int cat_4 = 0;   
    int i = 0;

    cout << "Please enter the marks the student has achived"; // ask the user to enter the mark
    cin >> mark; // marks the student achived

    for (int i = 0, i<=10, i++)
    {
        if (mark >=0 && mark <=29)
        { cat_1 ++;

        cout << ("cat_1");  cat_1;
        }

        else if (mark >=30 && mark <=39);
        { cat_2 ++;

        cout << ("cat_2");  cat_2;
        }

        else if (mark >=40 && mark <=69)
        { cat_3 ++;

        cout << ("cat_3");  cat_3 ;
        }

        else if (mark >=70 && mark <=100)
        { cat_4 ++;

        cout << ("cat_4");  cat_1 ;
        }

            system ("pause");

            return 0 ;
        }

---

I've made some changes on my code so far but the for loop and the if statements still not seem to work, can someone help me out?

Replace this

Code:

---

cout << ("cat_1");  cat_1;

---

to this

Code:

---

cout << ("cat_1") << cat_1;

---

Same for the other.

The thing in your code is that cat_1; by it's own has no effect and only the "cat_1" is sent to cout ;)

You may also want to look at arrays (std::array).

How do i find the highest and lowest mark?
I think i've made the statement but not sure where i should place it.. Thanks in advance :)
Here is the statement:

Code:

---

{
              if (mark == cat_3 || mark == cat_4) {
                   
cout >> “pass”<< student_pass << endl;          }
              else if (mark == cat_1 || mark == cat_2){
                    cout >> “fail” << student_fail <<endl;          }
      }

---

here is my code :

Code:

---


#include <iostream>
using namespace std;
int main ()

{
    // name the variables of catergories

    int cat_1 = 0; // category 1
    int cat_2 = 0; //  category 2
    int cat_3 = 0; // category 3
    int cat_4 = 0;    // category 4

    int i = 0;
    int total_marks = 0; // total marks
    int counter = 0; // adding the amount of marks entered by user
    int average_mark = 0; // the average mark from all the marks put together
    int pass = 0;
        int fail = 0;
    //number of students passing
    //highest mark
    //lowest mark


    int mark = 0;  // Marks entered by user
    cout << "Please enter the marks the students has achived " << endl; // ask the user to enter the mark
    cin >> mark; // marks the student achived from the user

    for (i = 0; i<=9; i++) // loop
    {

        total_marks = total_marks + mark;
        counter++; //total marks

        if (mark >=0 && mark <=29){
            cat_1 ++;
        }

        else if (mark >=30 && mark <=39){
            cat_2 ++;
        }

        else if (mark >=40 && mark <=69){
            cat_3 ++;
        }

        else if (mark >=70 && mark <=100){
            cat_4 ++;
        }
        cin >> mark;
    }



    cout << "Number of students with marks 0-29|";
    for (i = 0; i<cat_1; i++) {
        cout << "*";
    }
    cout << endl;

    cout << "Number of students with marks 30-39|";
    for (i = 0; i<cat_2; i++) {
        cout << "*";
    }
    cout << endl;

    cout << "Number of students with marks 40-69|";
    for (i = 0; i<cat_3; i++) {
        cout << "*";
    }
    cout << endl;

    cout << "Number of students with marks 70-100|";
    for (i = 0; i<cat_4; i++)
    {
        cout << "*";
    }
    cout << endl;

    cout << "The total amount of student marks is|" << counter << endl; // the number of student whose marks had been entered


    for (i = 0; i<counter; i++) {
        average_mark = total_marks / counter;//average mark between all the makes entered
    }

    cout << "The average mark is|" << average_mark <<endl;





        system ("Pause");
        return 0;
    }

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