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ok really thank you for answering me. I am a real beginner in programming. the concern the will is there but not easy. So that's what I did.

import 'dart:io';
import 'dart:math';

main() {
  print(somme(1, 2));
  print(multiplication(1, 2));
  print(division(1, 2));
  print(soustraction(1, 2));
}

int somme(int a, int b) {
  int result = a + b;
  return result;
}

int multiplication(int a, int b) {
  int result = a * b;
  return result;
}

int division(int a, int b) {
  int result = a ~/ b;
  return result;
}

int soustraction(int a, int b) {
  int result = a - b;
  return result;
}

print(foo(1, 2, "+"));
print(foo(6, 3, "/"));

Really thank you for answering me. but my instructor had already given me this indication. but like I told you I really can't. if you can give me more details that would do me a lot of good. Thank you for answering me.

olivier Dakouri wrote:

...but like I told you I really can't.

hello I tried myself but I can not add the other calculations (multiplication, subtraction, division). like i said i am really a beginner. Really thank you for answering me.

void main() {
  print(calcul(12, 10));
}

int calcul(int a, int b) {
  return a + b;
}

int calculate(int param1, int param2, char operator)
{
    int result = 0;
    if (operator == '+')
        result = param1 + param2;
    else if (operator == '-')
    // etc

    return result
}

// then
int sum = calculate(10, 23, '+');

Really thank you for your help I didn't know where to start. If you have any documentation that can help me understand better I am willing to study it thank you again.

Good evening

Write a numberElementsPairs function that returns the number of even elements in a list of integers.

Example

var list = [1, 2, 3, 5, 7, 8]
var result = numberElementsPairs (list)

here is my solution

void main() {
  nombreElementsPairs(List) {
    var list = [1, 2, 3, 5, 7, 8];
    var nombreElementsPairs = 0;
    var a;
    var resultat = 0;
    for (a in (list)) {
      if (a % 2 == 0) {
        resultat = a % 2;
      }
    }
    return resultat;
  }

  print('le nombre pair est $nombreElementsPairs(List)');
}

but it does not pass

olivier Dakouri wrote:

...returns the number of...

olivier Dakouri wrote:

if (a % 2 == 0) {

olivier Dakouri wrote:

resultat = a % 2;