Topic 1 : Conversion operation from value of char type to int type
It is known that the value of the int type variable a is 100, and the value of the char type variable c is 'medium'. After adding a and c, assign the value to the int type variable x. Please use binary (base 2) unsigned according to the output format requirements Outputs the string representation of a in integer form, the string representation of c in hexadecimal (base 16) unsigned integer form, and the decimal integer value corresponding to c and x in string representation.
Output format requirements: For example, the value of a is 500, and the value of c is 'country', the output content is as follows:
Outputs the string representation of a as a binary (base 2) unsigned integer: 111110100
The string representation of c in hexadecimal (base 16) unsigned integer form is: 56fd
Output the decimal integer value corresponding to a in string representation: 500
Output the decimal integer value corresponding to c in string representation: 22269
Output the decimal integer value corresponding to x in string representation: 22769
package test1;
public class work_01 {
public static void main(String[] args) {
int a=500;
char c='国';
String s="国";
int x=a+c;
System.out.print("以二进制（基数 2）无符号整数形式输出a的字符串表示形式为:");
print(a);
System.out.println("以十六进制（基数 16）无符号整数形式c的字符串表示形式为:"+Integer.toHexString(c));
System.out.println("以字符串表示形式输出a对应的十进制整数值为:"+a);
System.out.println("以字符串表示形式输出c对应的十进制整数值为:"+(int)c);
System.out.println("以字符串表示形式输出x对应的十进制整数值为:"+x);
}
public static void print(int num) {
for(int i=31;i>=0;i--) {
System.out.print((num&(1<<i))==0?"0":"1");/*1左移某个位，再和num相与，最终得到的就是num在该位上的数值*/
}
System.out.println();
}
public static String toHexString(String s){
String str="";
for(int i=0;i<s.length();i++){
int ch=(int)s.charAt(i);
String s4=Integer.toHexString(ch);
str=str+4;
}
return "0x:"+str;
}
}
The resulting output is as follows :
以二进制（基数 2）无符号整数形式输出a的字符串表示形式为:00000000000000000000000111110100
以十六进制（基数 16）无符号整数形式c的字符串表示形式为:56fd
以字符串表示形式输出a对应的十进制整数值为:500
以字符串表示形式输出c对应的十进制整数值为:22269
以字符串表示形式输出x对应的十进制整数值为:22769
Process finished with exit code 0
Topic 2 : Use the for loop to output the elements in the array
Define an array of int type {320, 871, 33, 5895, 126, 10761, 20001, 83, 6262, 1287}, and use the for loop to output the elements in the array.
output:
320 871 33 5895 126 10761 20001 83 6262 1287
public class work_08 {
public static void main(String[] args) {
int[]arr={320, 871, 33, 5895, 126, 10761, 20001, 83, 6262, 1287};
for(int i=0;i<arr.length;i++)
{
System.out.print(arr[i]+" ");
}
}
}The resulting output is as follows :
320 871 33 5895 126 10761 20001 83 6262 1287
Process finished with exit code 0Topic three :
Using Two-Dimensional Array Programming to Output Nine-Nine Multiplication Table
output:
1*1=1
2*1=2 2*2=4
3*1=3 3*2=6 3*3=9
4*1=4 4*2=8 4*3=12 4*4=16
5*1=5 5*2=10 5*3=15 5*4=20 5*5=25
6*1=6 6*2=12 6*3=18 6*4=24 6*5=30 6*6=36
7*1=7 7*2=14 7*3=21 7*4=28 7*5=35 7*6=42 7*7=49
8*1=8 8*2=16 8*3=24 8*4=32 8*5=40 8*6=48 8*7=56 8*8=64
9*1=9 9*2=18 9*3=27 9*4=36 9*5=45 9*6=54 9*7=63 9*8=72 9*9=81
public class work_12 {
public static void main(String[] args) {
for(int i=1;i<10;i++){
for(int j=1;j<=i;j++) {
int p = i * j;
System.out.print(i +"*"+ j + "=" + p+" ");
}
System.out.println();
}
}
}The resulting output is as follows :
1*1=1
2*1=2 2*2=4
3*1=3 3*2=6 3*3=9
4*1=4 4*2=8 4*3=12 4*4=16
5*1=5 5*2=10 5*3=15 5*4=20 5*5=25
6*1=6 6*2=12 6*3=18 6*4=24 6*5=30 6*6=36
7*1=7 7*2=14 7*3=21 7*4=28 7*5=35 7*6=42 7*7=49
8*1=8 8*2=16 8*3=24 8*4=32 8*5=40 8*6=48 8*7=56 8*8=64
9*1=9 9*2=18 9*3=27 9*4=36 9*5=45 9*6=54 9*7=63 9*8=72 9*9=81
Process finished with exit code 0