Predict the output:

#include iostream
using namespace std;
int main() {
    int marks;
   cout"enter the marks"endl;
   cinmarks;
   if(marks=90)
     {
   cout"grade a"endl;
       }
   else if(marks=80)
     {
   cout"grade b";
     }
   else if(marks=60)
     {
   cout"grade c";
     }
   else if(marks=40)
     { 
   cout"grade d";
     }
   else{
     cout"fail"endl;
  
       }
   }