[백준]단계 - for문

2739 - 구구단

let input = require('fs').readFileSync('/dev/stdin').toString();

let n = Number(input[0]);

for (let i = 1; i < 10; i++) {
    console.log(`${n} * ${i} = ${n*i}`);
}

10950 - A+B-3

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
});

const input = [];

rl.on('line', function (line) {
    input.push(line);
}).on('close', function () {

    const T = Number(input[0]); /*테스트 케이스의 개수 T = 5*/
    
    for(let i = 1; i <= T; i++) {
        let A = Number(input[i].split(' ')[0]);
        let B = Number(input[i].split(' ')[1]);
        console.log(A+B);
    }
    
    process.exit();
});

8393 - 합

const readline = require('readline');

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

rl.on('line', function (line) {
  let num = Number(line);
  let sum = 0;
    
  for(let i = 1; i <= num; i++) {
      sum += i;
  }

  console.log(sum);

}).on('close', function () {
  process.exit();
});