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JavaArithmetic/src/basic/ArithmeticOne.java at master · git-jhy/JavaArithmetic · GitHub
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JavaArithmetic
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src
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basic
/
ArithmeticOne.java
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JavaArithmetic
/
src
/
basic
/
ArithmeticOne.java
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package
basic
;
/**
* Created by zxc on 2018/3/23.
*/
public
class
ArithmeticOne
{
public
static
void
main
(
String
[]
args
) {
//int num = countWord("Please follow the Wechat public number");
//isUgly(30);
//System.out.println("关注公众号：Java3y--->" + "Please follow the Wechat public number");
//Factorial(3);
Factorial
(
7
);
}
/**
* 判断一个数字是不是ugly number（分解出来的质因数只有2、3、5这3个数字）
*
* @param num
*/
public
static
void
isUgly
(
int
num
) {
if
(
num
<=
0
) {
System
.
out
.
println
(
"不是"
);
}
else
{
while
(
num
%
2
==
0
) {
num
=
num
/
2
;
}
while
(
num
%
3
==
0
) {
num
=
num
/
3
;
}
while
(
num
%
5
==
0
) {
num
=
num
/
5
;
}
if
(
num
==
1
) {
System
.
out
.
println
(
"是"
);
}
else
{
System
.
out
.
println
(
"是"
);
}
}
}
/**
* 判断是否是2的某次方
*/
public
static
void
isPowerOfTwo
() {
int
num
=
8
;
/*
if (num == 0) {
System.out.println("不是");
}
while (num % 2 == 0) {
num = num / 2;
}
if (num == 1) {
System.out.println("是");
} else {
System.out.println("不是");
}
*/
if
(
num
<=
0
) {
System
.
out
.
println
(
"不是"
);
}
else
if
(
num
==
1
) {
System
.
out
.
println
(
"是"
);
}
else
{
if
((
num
& (
num
-
1
)) ==
0
) {
System
.
out
.
println
(
"是"
);
}
else
{
System
.
out
.
println
(
"不是"
);
}
}
}
/**
* 给定两个字符串s和t，判断这两个字符串中的字母是不是完全一样（顺序可以不一样）
*/
public
static
void
isAnagram
() {
//分别存储字符串的字符
char
[]
array1
=
new
char
[
26
];
char
[]
array2
=
new
char
[
26
];
String
s1
=
"pleasefollowthewechatpublicnumber"
;
String
s2
=
"pleowcnumberthewechatpubliasefoll"
;
for
(
int
i
=
0
;
i
<
s1
.
length
();
i
++) {
char
value
=
s1
.
charAt
(
i
);
// 算出要存储的位置
int
index
=
value
-
'a'
;
array1
[
index
]++;
}
for
(
int
i
=
0
;
i
<
s2
.
length
();
i
++) {
char
value
=
s2
.
charAt
(
i
);
// 算出要存储的位置
int
index
=
value
-
'a'
;
array2
[
index
]++;
}
for
(
int
i
=
0
;
i
<
26
;
i
++) {
if
(
array1
[
i
] !=
array2
[
i
]) {
System
.
out
.
println
(
"不相同"
);
return
;
}
}
System
.
out
.
println
(
"相同"
);
}
/**
* 输入一段字符，计算出里面单词的个数
*
* @param str 一段文字
*/
public
static
int
countWord
(
String
str
) {
// 0 表示空格状态，1 表示非空格状态
int
flag
=
0
;
// 单词次数
int
num
=
0
;
for
(
int
i
=
0
;
i
<
str
.
length
();
i
++) {
if
(
String
.
valueOf
(
str
.
charAt
(
i
)).
equals
(
" "
)) {
flag
=
0
;
}
else
if
(
flag
==
0
) {
num
++;
flag
=
1
;
}
}
return
num
;
}
/**
* 猴子吃桃问题
*
* @param x 天数
*/
public
static
int
monkeyQue
(
int
x
) {
/*
//循环方式：
int x = 1;
for (int i = 1; i <= 9; i++) {
x = (x + 1) * 2;
}
*/
if
(
x
<=
0
) {
return
0
;
}
else
if
(
x
==
1
) {
return
1
;
}
else
{
return
2
*
monkeyQue
(
x
-
1
) +
2
;
}
}
/**
* 打印杨辉三角形
*/
public
static
void
PascalTriangle
() {
//打印十行的杨辉三角形
int
[][]
arrays
=
new
int
[
10
][];
//行数
for
(
int
i
=
0
;
i
<
arrays
.
length
;
i
++) {
//初始化第二层的大小
arrays
[
i
] =
new
int
[
i
+
1
];
//列数
for
(
int
j
=
0
;
j
<=
i
;
j
++) {
//是第一列并且行数等于列数，那么通通为1
if
(
i
==
0
||
j
==
0
||
j
==
i
) {
arrays
[
i
][
j
] =
1
;
}
else
{
//当前值等于头上的值+头上左边的值
arrays
[
i
][
j
] =
arrays
[
i
-
1
][
j
] +
arrays
[
i
-
1
][
j
-
1
];
}
}
}
System
.
out
.
println
(
"公众号：Java3y"
+
"-------------------------------"
);
for
(
int
[]
array
:
arrays
) {
for
(
int
value
:
array
) {
System
.
out
.
print
(
value
+
"
\t
"
);
}
System
.
out
.
println
();
}
System
.
out
.
println
(
"公众号：Java3y"
+
"-------------------------------"
);
}
/**
* 数组对角线之和
*/
public
static
void
arraySum
() {
int
[][]
arrays
= {
{
23
,
106
,
8
,
234
},
{
25
,
9
,
73
,
19
},
{
56
,
25
,
67
,
137
},
{
33
,
22
,
11
,
44
},
};
//和
int
sum
=
0
;
for
(
int
i
=
0
;
i
<
arrays
.
length
;
i
++) {
for
(
int
j
=
0
;
j
<
arrays
[
i
].
length
;
j
++) {
if
(
i
==
j
) {
sum
=
sum
+
arrays
[
i
][
j
];
}
}
}
System
.
out
.
println
(
"公众号：Java3y"
+
sum
);
}
/**
* 1-n的阶乘之和
*/
public
static
void
Factorial
(
int
n
) {
//总和
double
sum
=
0
;
//阶乘值，初始化为1
double
factorial
=
1
;
for
(
int
i
=
1
;
i
<=
n
;
i
++) {
factorial
=
factorial
*
i
;
sum
= (
int
) (
sum
+
factorial
);
}
System
.
out
.
println
(
"公众号：Java3y"
+
" "
+
sum
);
}
/**
* 求出二维数组每列的最小值
*/
public
static
void
minArray
() {
//二维数组
int
[][]
arrays
= {
{
23
,
106
,
8
,
234
},
{
25
,
9
,
73
,
19
},
{
56
,
25
,
67
,
137
}
};
//获取列数
int
maxColLength
=
arrays
[
0
].
length
;
//使用一个数组来装载每列最小的值
int
[]
minArray
=
new
int
[
maxColLength
];
//控制列数
for
(
int
i
=
0
;
i
<
maxColLength
;
i
++) {
//假设每列的第一个元素是最小的
int
min
=
arrays
[
0
][
i
];
//控制行数
for
(
int
j
=
1
;
j
<
arrays
.
length
;
j
++) {
//找到最小值
if
(
arrays
[
j
][
i
] <
min
) {
min
=
arrays
[
j
][
i
];
}
}
//赋值给装载每列最小的值的数组
minArray
[
i
] =
min
;
}
System
.
out
.
println
(
"公众号：Java3y"
+
" "
+
minArray
);
}
/**
* 求"1！+4！(2的平方)+9！(3的平方)+...+n的值
*/
public
static
void
calculate
() {
double
sum
=
0
;
for
(
int
i
=
1
;
i
<=
3
;
i
++) {
//得到平方数
int
square
=
i
*
i
;
//阶乘值，从1开始
double
factorial
=
1
;
//求阶乘
for
(
int
j
=
1
;
j
<=
square
;
j
++) {
factorial
=
factorial
*
j
;
}
sum
=
sum
+
factorial
;
}
System
.
out
.
println
(
"公众号：Java3y"
+
" "
+
sum
);
}
}
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