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WorksheetsDay 8
Total questions: 20
Worksheet time: 10mins
String s = "java";
String t = "";
for (int i = s.length() - 1; i >= 0; i--) {
t = t + s.charAt(i);
}
System.out.println(s == t);
true
false
javaavaj
avaj
int x = 59;
int y = 71;
System.out.println(x ^ y);
122
123
124
125
int x = 2;
switch (x) {
case 1:
System.out.print("A");
case 2:
System.out.print("B");
case 3:
System.out.print("C");
break;
default:
System.out.print("D");
}
ABC
ERROR
BC
BCD
int[][] a = {
{1, 2, 3},
{4, 5, 6},
{7, 8, 9}
};
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
if (i + j == 2)
System.out.print(a[i][j] + " ");
}
}
1 5 9
3 5 7
7 5 3
2 4 6
int x = 50 ^ 30 ^ 5;
System.out.println(x);
30
40
31
41
int x = 4 | 3 & 2;
System.out.println(x);
2
4
6
8
String s = "Code";
s.concat("Java");
System.out.println(s);
Java
JavaCode
Code
error
class Test {
static void fun(String s, int i) {
if (i == s.length()) return;
fun(s, i + 1);
System.out.print(s.charAt(i));
}
public static void main(String[] args) {
fun("JAVA", 0);
}
}
AVAJ
JAVA
No output
JAVAAVAJ
int[][] a = {
{1, 2, 3},
{4, 5, 6},
{7, 8, 9}
};
for (int i = 0; i < 3; i++) {
for (int j = i; j < 3; j++) {
System.out.print(a[i][j] + " ");
}
}
1 2 3 5 6 9
1 2 3 4 5 6 7 8 9
1 5 9
3 6 9
int[][] a = {
{1, 2, 3},
{4, 5, 6},
{7, 8, 9}
};
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
if (i + j == 1)
System.out.print(a[i][j] + " ");
}
}
2 4
6 8
1 5 9
3 4 7
int[][] a = {
{1, 2, 3},
{4, 5, 6},
{7, 8, 9}
};
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
if (a[i][j] == 5)
break;
System.out.print(a[i][j] + " ");
}
}
1 2 3 4
1 2 3 4 5
1 2 3
1 2 3 4 7 8 9
int[] arr = {7, 3, 5};
int result = arr[0];
for (int i = 1; i < arr.length; i++) {
result = result & arr[i];
}
System.out.println(result);
3
1
5
7
int[] arr = {1, 2, 4};
for (int i = 0; i < arr.length; i++) {
System.out.print(arr[i] | i);
}
136
135
145
127
int[] arr = {3, 6, 9};
for (int i = 0; i < arr.length; i++) {
arr[i] = arr[i] & i;
}
System.out.println(arr[2]);
1
8
0
2
int[] arr = {12, 10, 9};
int count = 0;
for (int i = 0; i < arr.length; i++) {
if ((arr[i] & 1) == 0)
count++;
}
System.out.println(count);
0
1
2
3
int[] arr = {5, 1, 3, 5};
int res = 0;
for (int i = arr.length - 1; i >= 0; i--) {
res ^= (arr[i] << i);
}
System.out.println(res);
34
36
35
48
int[] arr = {2, 4, 8};
int x = arr[0];
for (int i = 1; i < arr.length; i++) {
x = (x | arr[i]) ^ i;
}
System.out.println(x);
13
14
15
16
int[] arr = {7, 3, 5};
for (int i = 0; i < arr.length; i++) {
for (int j = 0; j <= i; j++) {
arr[i] ^= arr[j];
}
}
System.out.println(arr[2]);
1
0
3
5
int[] arr = {4, 6, 4, 6, 8};
int x = 0;
for (int i = 0; i < arr.length; i++) {
x ^= (arr[i] & i);
}
System.out.println(x);
0
2
4
8
int[] arr = {5, 10};
arr[0] = arr[0] ^ arr[1];
arr[1] = arr[0] & arr[1];
arr[0] = arr[0] | arr[1];
System.out.println(arr[0] + " " + arr[1]);
15 10
10 5
10 15
5 10
