Compilation error in c++ program

Question

I'm having compilation problems. I can't see where my error came from. Can, someone help me? The goal of this code is to ingress a date and to check if it's right.

   #include<iostream>
   #include<math.h>
   #include<cmath>
   using namespace std;

int main(){

    int d, m, a;
    cout << "entrar dia"<<endl;
    cin>>d;
    cout << "entrar mes"<<endl;
    cin>>m;
    cout << "entrar ano"<<endl;
    cin>>a;
    if(d<1 || d>32|| m<1 || m>13 || a<1960 || a>2022) {
        cout<<"Fecha incorrecta"<<endl;
        else {

            if( (m==4 || m==6 || m==9 || m==11) && d>30){
                cout<<"Fecha incorrecta"<<endl;
            }
        }
        else {


            if((m == 2 && a % 4 = 0 && d > 28) || (m == 2 && a % 4 == 0 && d > 29)) {
                cout<< "Fecha incorrecta"<<endl;
            }
        }

        else {
                cout <<"Fecha correcta"<<endl;
        }

    }}

Thanks

Please read the guidelines before posting. "I have an error" is not helpful. Copy-paste the full error message. — Cris Luengo, Mar 19 '18 at 01:21
(There is an *awful* lot of guidelines - start with [How do I ask a good question?](https://stackoverflow.com/questions/how-to-ask).) — greybeard, Mar 19 '18 at 02:10

score 2 · Answer 1 · answered Mar 19 '18 at 01:25

You should really use nested if statements. This helps keep your conditional logic clean, unfortunately, you have else clause's out of their expected sequence. Also your final else if had an assignment operator = instead of the equality operator ==

#include<iostream>
#include<math.h>
#include<cmath>

using namespace std;

int main ()
{
  int d, m, a;
  cout << "entrar dia" << endl;
  cin >> d;
  cout << "entrar mes" << endl;
  cin >> m;
  cout << "entrar ano" << endl;
  cin >> a;
  if (d < 1 || d > 32 || m < 1 || m > 13 || a < 1960 || a > 2022)
  {
    cout << "Fecha incorrecta" << endl;
  }
  else if ((m == 4 || m == 6 || m == 9 || m == 11) && d > 30)
  {
    cout << "Fecha incorrecta" << endl;
  }
  else if ((m == 2 && a % 4 == 0 && d > 28)
      || (m == 2 && a % 4 == 0 && d > 29))
  {
      cout << "Fecha incorrecta" << endl;
  }
  else
  {
      cout << "Fecha correcta" << endl;
  }
}

Compilation error in c++ program

1 Answers1