### LANGUAGE: JAVA

### CHALLENGE:

Both are 0, or

x-1 and y-1 are equal

Write a boolean-method named equals that recursively determines whether its two int parameters are equal and returns true if they are and false otherwise.

### SOLUTION:

boolean equals (int x, int y){ if( (x<0) || (y<0) ) return false; if( (x==0) && (y==0) ) return true; return equals(x-1, y-1); }