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ICSE Class 10 Computer Applications Question 42 of 43

User-Defined Methods — Question 42

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42
Question

Question 40

What is the output of the following program?

class AllStatic 
{ 
    static int m = 0 ; 
    static int n = 0 ;
    public static void main(String[ ] args)
    {
    int m = 10;
    int x = 20;
    {	    
        int n = 30 ;
        System.out.println("m + n =" + m + n) ; 
        check(5) ;
    }
    x = m + n; 
    System.out.println("x =" + x) ;
}
    public static void check int  k ;
    {	
        int m = 5 ;
        n = k;
        System.out.println("m is " + m) ; 
        System.out.println("n is " + n) ;
    }
}
Answer

The given code generates an error due to wrong method prototype — public static void check int k ;

The correct syntax of the method will be —

public static void check (int k)

Assuming the method prototype was correct, the following output will be generated:

m + n = 1030
m is 5
n is 5
x = 15
Explanation

Initially, m = 10 and n = 30.

The value 5 is passed by value to the function check(). The function check() declares a local variable m whose value is 5. The value of n is modified to 5. Both the values (m and n) are printed and then the control goes back to the statement following the method call.

The value of x becomes 15 (since m = 10 and n = 5). Inside the main(), the value of local variable m is 10 and n is 5.