Julia简易教程——2_julia数学运算及其基本功能

# 加
julia > 1 + 2
3
julia > 1 + 2 + 3
6

# 减
julia > 2 - 1 
1
julia > 1 - 2
-1

# 乘
julia > 2 * 4
8
julia > 2 * 4 * 2
16

# 除
# 无论两元是否为浮点，结果为均为浮点
julia > 4 / 2
2.0

# 逆除
julia > 4 \ 2
0.5

# 次方
julia > 4 ^ 2
16

# 模
julia > 4 % 2
0
julia > 4 % 3
1

# 取反
julia > ~10
-11

# 按位与运算
julia > 123 & 234
106

# 按位或运算
julia > 123 & 234
251

# 异或xor
julia > xor(123 , 234)
145

# 逻辑右移
julia > 9 >>> 3
1

# 算术右移
julia > 9 >> 3
1

# 逻辑/算术左移
julia > 9 << 3
72

# 判断是否相等
julia > 1 == 1
true
julia > 1 == 2
false
julia > 1 == 1.0
true
julia > 1 != 2
true

# 小于
julia> 1 < 2
true
julia> 3 < -0.5
false

# 大于
julia> 1.0 > 3
false

# 大于等于
julia> 1 >= 1.0
true

# 小于等于
julia> -1 <= 1
true
julia> -1 <= -1
true
julia> -1 <= -2
false

julia > NaN == NaN
false

julia > NaN != NaN
true

julia > NaN < NaN
false

julia > NaN > NaN
false

# isequal(x, y)
julia > isequal(NaN, NaN)
true
julia > isequal([1 NaN], [1 NaN])
true
julia > isequal(NaN, NaN32)
true

# isfinite(x)
julia > isfinite(0)
true
julia > isfinite(NaN)
false

# isnan(x)
julia > isnan(0)
false
julia > isnan(NaN)
true

# round(x)
julia> round(2.4)
2.0
julia> round(2.5)
2.0
julia> round(2.6)
3.0
julia> round(-2.6)
-3.0
julia> round(-2.4)
-2.0
julia> round(-2.5)
-2.0

# floor(x)
julia> floor(2.4)
2.0
julia> floor(2.5)
2.0
julia> floor(2.6)
2.0
julia> floor(-2.6)
-3.0
julia> floor(-2.5)
-3.0
julia> floor(-2.4)
-3.0

# ceil(x)
julia> ceil(2.5)
3.0
julia> ceil(2.6)
3.0
julia> ceil(-2.6)
-2.0
julia> ceil(-2.5)
-2.0
julia> ceil(-2.4)
-2.0

# trunc(x)
julia> trunc(2.4)
2.0
julia> trunc(2.5)
2.0
julia> trunc(2.6)
2.0
julia> trunc(-2.6)
-2.0
julia> trunc(-2.5)
-2.0
julia> trunc(-2.4)
-2.0