The first line gives the number of students n, and the second line gives n scores.
For each score print its grade on its own line: A for 90 or more, B for 80 or more, C for 70 or more, D for 60 or more, otherwise F.
4 95 80 61 59
A B D F
When you run, these lines are fed to input()/stdin in order (the program doesn't stop to ask).
$ Ready
Open this on a computer to write and run code. On mobile you can read the problem and the solutions.
Mixing up >= and > at the boundaries (90, 80, 70, 60) is the most common mistake.
Checking from the top down means earlier conditions already filter, so you never need 80 <= x < 90.
Iterating a list: Python for x in, Java for (int x : a), C# foreach, Craykon foreach (x in a).
n = int(input())for x in map(int, input().split()): if x >= 90: print("A") elif x >= 80: print("B") elif x >= 70: print("C") elif x >= 60: print("D") else: print("F")const [n, ...scores] = require("fs").readFileSync(0, "utf8").trim().split(/\s+/).map(Number);const grade = (x) => (x >= 90 ? "A" : x >= 80 ? "B" : x >= 70 ? "C" : x >= 60 ? "D" : "F");console.log(scores.map(grade).join("\n"));import { readFileSync } from "node:fs";const [n, ...scores]: number[] = readFileSync(0, "utf8").trim().split(/\s+/).map(Number);const grade = (x: number): string => (x >= 90 ? "A" : x >= 80 ? "B" : x >= 70 ? "C" : x >= 60 ? "D" : "F");console.log(scores.map(grade).join("\n"));import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); StringBuilder out = new StringBuilder(); for (int i = 0; i < n; i++) { int x = sc.nextInt(); if (x >= 90) out.append("A\n"); else if (x >= 80) out.append("B\n"); else if (x >= 70) out.append("C\n"); else if (x >= 60) out.append("D\n"); else out.append("F\n"); } System.out.print(out); }}using System; class Program{ static void Main() { Console.ReadLine(); foreach (string s in Console.ReadLine().Split(' ', StringSplitOptions.RemoveEmptyEntries)) { int x = int.Parse(s); Console.WriteLine(x >= 90 ? "A" : x >= 80 ? "B" : x >= 70 ? "C" : x >= 60 ? "D" : "F"); } }}#include <iostream> int main() { int n, x; std::cin >> n; for (int i = 0; i < n; i++) { std::cin >> x; if (x >= 90) std::cout << "A\n"; else if (x >= 80) std::cout << "B\n"; else if (x >= 70) std::cout << "C\n"; else if (x >= 60) std::cout << "D\n"; else std::cout << "F\n"; }}#include <stdio.h> int main(void) { int n, x; scanf("%d", &n); for (int i = 0; i < n; i++) { scanf("%d", &x); if (x >= 90) puts("A"); else if (x >= 80) puts("B"); else if (x >= 70) puts("C"); else if (x >= 60) puts("D"); else puts("F"); } return 0;}n = Console.ReadLine().ToNumber();scores = Console.ReadNumbers();foreach (x in scores){ if (x >= 90) { Console.WriteLine("A"); } else if (x >= 80) { Console.WriteLine("B"); } else if (x >= 70) { Console.WriteLine("C"); } else if (x >= 60) { Console.WriteLine("D"); } else { Console.WriteLine("F"); }}