'My code is giving me some weird message, but I don't know how to interpret it

When I try and compile this code, Eclipse gives these two errors:

  • for the maxmin function: illegal modifier for maxmin; only final is permitted

  • for Mn: Mn cannot be resolved to a variable

Why do these two errors appear?

I think this might have answered it, but I can't understand the jargon used in it.

Here's my code:

    public static int maxmin(int [][]B, int ver) {
        if (ver == 1) {            // Maximum operation
            int M = 0;
            for (int m = 1; m < 3; m++) {
                for (int n = 1;n < 3; n++) {
                    if (M < B[m][n]) {
                        M = B[m][n];
                    }
                }
            }
            return M;
        } else if (ver == 2) {     // Minimum operation
            int Mn = 10;
        }

        for (int m = 1; m < 3; m++) {
            for (int n = 1; n < 3; n++) {
                if (Mn > B[m][n]) {
                    Mn = B[m][n];
                }
            }
        }
    }
    return Mn;

}
javastaticmaxmin


Solution 1:[1]

The Mn variable is defined inside the else if block. Hence when you are accessing it inside the for loop, it does not find its declaration. Insetad you should move the declaration int Mn = 0 at the beginning the method and assign it to 10 inside the else if

Solution 2:[2]

public static int maxmin(int[][] B, int ver) {
    if (ver == 1) {// max operation
        int M = 0;
        for (int m = 1; m < 3; m++) {
            for (int n = 1; n < 3; n++) {
                if (M < B[m][n]) {
                    M = B[m][n];
                }
            }
        }
        return M;
    } else if (ver == 2) {// min operation
        int Mn = 10;

        for (int m = 1; m < 3; m++) {
            for (int n = 1; n < 3; n++) {
                if (Mn > B[m][n]) {
                    Mn = B[m][n];
                }
            }
        }
        return Mn;
    } else {
        throw new IllegalArgumentException("invalid ver, must be 1 or 2");
    }
}

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Ashish
Solution 2 salyh

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