Hello there. I'm a "freshman" in programming :D and now I need a lil' help

[Ama_1]

// This program uses a switch-case statement to assign a
//letter grade (A, B, C, D, or F) to a number test score.
#include<iostream>
using namespace std;

int main()
{
    char grade;                int  testScore = 10;

    cout << "Enter your test score and I will tell you\n";
    cout << "the letter grade you earned: ";
    cin >> grade;
    switch (testScore)

    {
    case 10:
    case 5:
        testScore < 60.0;
        cout << "Your grade is f.\n";
        break;
    case 6:
        testScore >= 70.0;
        cout << "Your grade is D.\n";
        break;
    case 7:
        testScore >= 80.0;
        cout << "Your grade is C.\n";
        break;
    case 8:
        testScore >= 90.0;
        cout << "Yor grade is B.\n";
        break;
    case 9:
        testScore <= 100.0;
        cout << "Your grade is A.\n";
        break;
    default:
        cout << "That score isn't valid.\n";

        return 0;
    }
    }

[AssertNull]

Lines 10, 11, 12 : You ask the user to enter the test score and you will determine the grade from that, but line 12 takes input for grade, not testScore?

testScore < 60.0;

< is used to compare two values. It is not used all by itself in a line.

Switch statements are generally used when there are a handful of values that a variable can hold. They are normally NOT used when checking whether a value is inside a RANGE of values (ie 60 to 70).

Seems to me you should be using if-else if-else code rather than switch code here.

if(testScore < 60)
{
     grade = 'F';
}
else if(testScore < 70)
{
     grade = 'D';
}
else
{
    grade = 'A';
}

Add a few more else if blocks in there for grades 'C' and 'B'.