result of my quiz will always be 0

Hi,guys I almost follow exactly the same of the example ans,but no matter how many correct ans I type,the result will always come back 0correct I feel like maybe I lack the parseInt?not sure,but I think the questions are no numbers involved,so I don't need one? just like the example ans.

//quiz start var correct=0;

//question var visitor1=prompt('who lead goverment?'); if(visitor1.toUpperCase==='PRESIDENT'){ correct+=1; }

var visitor2=prompt('what thing can shoot bullets?'); if(visitor2.toUpperCase==='GUN'){ correct+=1; }

var visitor3=prompt('usually people pet a dog or?'); if(visitor3.toUpperCase==='CAT'){ correct+=1; }

var visitor4=prompt('what do asain usually eat?'); if(visitor4.toUpperCase==='RICE'){ correct+=1; }

var visitor5=prompt('which race is the most wealthy one?'); if(visitor5.toUpperCase==='WESTERN'){ correct+=1; }

//results document.write('<p>you have got '+correct+' answers right</p>');

//ranking the results if (correct===5){ document.write('<p>You have eanred a gold crown</p>'); }else if(correct >=3 ){ document.write('<p>You have eanred a sliver crown</p>'); }else if (correct >=1 ){ document.write('<p>You have eanred a bronze crown</p>'); }else { document.write('<p>You fkin idiot!</p>'); }