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44 lines
892 B
44 lines
892 B
package class08;
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public class Code01_GetMax {
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public static int flip(int n) {
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return n ^ 1;
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}
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public static int sign(int n) {
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return flip((n >> 31) & 1);
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}
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public static int getMax1(int a, int b) {
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int c = a - b;
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int scA = sign(c);
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int scB = flip(scA);
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return a * scA + b * scB;
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}
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public static int getMax2(int a, int b) {
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int c = a - b;
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int sa = sign(a);
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int sb = sign(b);
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int sc = sign(c);
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int difSab = sa ^ sb;
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int sameSab = flip(difSab);
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int returnA = difSab * sa + sameSab * sc;
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int returnB = flip(returnA);
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return a * returnA + b * returnB;
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}
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public static void main(String[] args) {
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int a = -16;
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int b = -19;
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System.out.println(getMax1(a, b));
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System.out.println(getMax2(a, b));
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a = 2147483647;
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b = -2147480000;
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System.out.println(getMax1(a, b)); // wrong answer because of overflow
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System.out.println(getMax2(a, b));
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}
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}
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