Given the following: public int mystery3(int x , int y) { if(x < 0) return-myste

Question

Given the following: public int mystery3(int x , int y) {    if(x < 0)       return-mystery3(-x,y);    else if(y < 0)       return-mystery3(x,-y);    else if(x == 0 && y ==0)       return 0;    else       return 100 *mystery3(x/10, y/10) + 10 * (x % 10) + y % 10; } What is returned by the method call: a)   mystery3(5, 7)__________ b)   mystery3(12, 9)__________ c)   mystery3(-7, 4)_________ d)   mystery3(13, 72)________ e)   mystery3(-23, -48)_________ f)   mystery3(128, 343)_________ Given the following: public int mystery3(int x , int y) {    if(x < 0)       return-mystery3(-x,y);    else if(y < 0)       return-mystery3(x,-y);    else if(x == 0 && y ==0)       return 0;    else       return 100 *mystery3(x/10, y/10) + 10 * (x % 10) + y % 10; } What is returned by the method call: a)   mystery3(5, 7)__________ b)   mystery3(12, 9)__________ c)   mystery3(-7, 4)_________ d)   mystery3(13, 72)________ e)   mystery3(-23, -48)_________ f)   mystery3(128, 343)_________

Explanation / Answer

[a] 57 [b] 1029 [c] -74 [d] 1732 [e] 2438 [e] 132483 //here is trace of each call         callingmystery3(5,7)         none of the case, socompute 100 * mystery3(x/10, y/10) + 10 * (x % 10)+ y%10            calling mystery3(0,0)            x==0 && y==0, so return 0            return 0         return 57 [a] 57         callingmystery3(12,9)         none of the case, socompute 100 * mystery3(x/10, y/10) + 10 * (x % 10)+ y%10            calling mystery3(1,0)            none of the case, so compute 100 * mystery3(x/10, y/10) + 10 * (x %10)+ y%10                calling mystery3(0,0)                x==0 && y==0, so return 0                return 0            return 10         return 1029 [b] 1029         callingmystery3(-7,4)         x

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