code gets stock in keypad function

Question

i am doing this project where i want to put a keypad and take in password from a user and then open the door or not. i used C but every time i call the keypad function in my code the code will not continue. pls help me

void keypad()
{
 int i,j;
 int x=0,k=0;
 delay(2000);
 while(k<4)
 { 
 for(i=0;i<4;i++)
 {
 digitalWrite(col[i], LOW);
 for(j=0;j<4;j++) 
 {
 if(digitalRead(row[j])==0)
 {
 setCursor(x,1);
 write(num[i][j]);
 buzzer();
 setCursor(x,1);
 write('*');
 x++;
 pass[k++]=num[i][j];
 while(digitalRead(row[j])==0); 
 } 
 }
 digitalWrite(col[i], HIGH);
 }
 }
 }

Answer 1

I am not going to try to debug code with an unknown requirements specification.

I will point out that the loop will not leave while k is less than 4. I would think about why k is not changing.