Can someone please help me I don't know how to fix this errors include definition is

[kim21249]

Hi,
so, I am making a program which will flash different lights every time a different note is played (trying to play happy birthday). I keep getting the same errors and I have no idea how to fix them. Please help me.
This is my code:

int piezo = 8;
int ledrood = 2;
int ledgeel = 4;
int ledgroen = 7;
int ledblauw = 12;
int ledwit = 13;
int tweekeerlied = 50;
char namen[] = {'A','B','C','D','E','F','G'};
int tonen[] = {440, 493, 262, 294, 330, 349, 392};
char noten[] = {"GGAGCBGGAGDCGGGECBAFFECDC"};
int ritme[] = {3,2,2,2,2,4,3,2,2,2,2,3,2,2,2,2,2,2,3,2,2,2,2,4}; 
 
int tempo = 100;
 
 
void setup() {
  pinMode(piezo,OUTPUT);
  pinMode(ledwit, OUTPUT);
  pinMode(ledblauw, OUTPUT);
  pinMode(ledgroen, OUTPUT);
  pinMode(ledgeel, OUTPUT);
  pinMode(ledrood, OUTPUT);
}
 
void loop() {
  int i, lengte;
  for (i=0; i < tweekeerlied; i++)
  {lengte = ritme[i] * tempo;
   {if (noten[i] = ' ')
  {delay = lengte;}
   else {
     tone(piezo, tonen(noten[i]), lengte);
       if((tonen(noten[i]) = 392) || (tonen(noten[i]) = 440))
       {digitalWrite(ledrood, HIGH);
        delay(lengte);}
     else if ((tonen(noten[i]) = 349) || (tonen(noten[i]) = 493))
              {digitalWrite(ledgeel, HIGH);
               delay(lengte);}
              else if (tonen(noten[i]) = 330)
              {digitalWrite(ledgroen, HIGH);
               delay(lengte);}
              else if ((tonen(noten[i]) = 294) || (tonen(noten[i]) = 440) || (tonen(noten[i]) = 493))
              {digitalWrite(ledblauw, HIGH);
               delay(lengte);}
     else if (tonen(noten[i]) = 262)
              {digitalWrite(ledwit, HIGH);
               delay(lengte);};
     }
   }
              digitalWrite(ledrood, LOW);
              digitalWrite(ledgeel, LOW);
              digitalWrite(ledgroen, LOW);
              digitalWrite(ledblauw, LOW);
              digitalWrite(ledwit, LOW);
              delay(tempo/2);
  }
  while(true)
              {noTone(piezo);
               digitalWrite(ledrood, LOW);
               digitalWrite(ledgeel, LOW);
               digitalWrite(ledgroen, LOW);
               digitalWrite(ledblauw, LOW);
               digitalWrite(ledwit, LOW);
}
 
{int ritme(char noten)
              {int i;
               int notenaantal = 7;
               for(i=0;i<notenaantal;i++)
               {if (namen[i] == noten)
               {return(ritme[i]);}
                else {return(0)}
               }
              }
}

And these are my errors:

In function 'void loop()':
 
29:12: error: assignment of function 'void delay(long unsigned int)'
 
   {delay = lengte;}
 
            ^~~~~~
 
29:12: error: cannot convert 'int' to 'void(long unsigned int)' in assignment
 
31:32: error: 'tonen' cannot be used as a function
 
      tone(piezo, tonen(noten[i]), lengte);
 
                                ^
 
32:26: error: 'tonen' cannot be used as a function
 
        if((tonen(noten[i]) = 392) || (tonen(noten[i]) = 440))
 
                          ^
 
32:53: error: 'tonen' cannot be used as a function
 
        if((tonen(noten[i]) = 392) || (tonen(noten[i]) = 440))
 
                                                     ^
 
35:30: error: 'tonen' cannot be used as a function
 
      else if ((tonen(noten[i]) = 349) || (tonen(noten[i]) = 493))
 
                              ^
 
35:57: error: 'tonen' cannot be used as a function
 
      else if ((tonen(noten[i]) = 349) || (tonen(noten[i]) = 493))
 
                                                         ^
 
38:38: error: 'tonen' cannot be used as a function
 
               else if (tonen(noten[i]) = 330)
 
                                      ^
 
41:39: error: 'tonen' cannot be used as a function
 
               else if ((tonen(noten[i]) = 294) || (tonen(noten[i]) = 440) || (tonen(noten[i]) = 493))
 
                                       ^
41:66: error: 'tonen' cannot be used as a function
 
               else if ((tonen(noten[i]) = 294) || (tonen(noten[i]) = 440) || (tonen(noten[i]) = 493))
 
                                                                  ^
41:93: error: 'tonen' cannot be used as a function
 
               else if ((tonen(noten[i]) = 294) || (tonen(noten[i]) = 440) || (tonen(noten[i]) = 493))
 
                                                                                             ^
 
44:29: error: 'tonen' cannot be used as a function
 
      else if (tonen(noten[i]) = 262)
 
                             ^
66:15: error: a function-definition is not allowed here before '{' token
 
               {int i;
 
               ^
 
74:1: error: expected '}' at end of input
 
 }
 
 ^
 
exit status 1
assignment of function 'void delay(long unsigned int)'

Please help me. I would really appreciate it

[dev7060]

29:12: error: assignment of function 'void delay(long unsigned int)'

Assigning something to a function?

29:12: error: cannot convert 'int' to 'void(long unsigned int)' in assignment

Comparison operator needs to be used instead of the assignment operator.

error: 'tonen' cannot be used as a function

"tonen" is an array.

66:15: error: a function-definition is not allowed here before '{' token

74:1: error: expected '}' at end of input

Watch out for the curly braces.