arithmetic.yaml

name: "Arithmetic"
cases:
  - name: "Empty expression"
    stdin: |
      echo $(())

  - name: "Unquoted arithmetic"
    stdin: |
      echo $((1+1))

  - name: "Arithmetic literals"
    stdin: |
      echo "$((0))"
      echo "$((1))"
      echo "$((10))"
      echo "$((010))"
      echo "$((0010))"
      echo "$((0x10))"
      echo "$((0x010))"

  - name: "Arithmetic literals with explicit bases"
    stdin: |
      echo "$((2#1010))"
      echo "$((8#16))"
      echo "$((16#faf))"
      echo "$((36#vvv))"

  - name: "Arithmetic literals with base 64 encoding"
    known_failure: true # Not currently handled.
    stdin: |
      echo "$((64#zzz))"

  - name: "Parentheses"
    stdin: |
      echo "$(((10)))"
      echo "$((((10))))"
      echo "$(((((10)))))"

      echo "$(( (10) ))"
      echo "$(( (1+2) ))"
      echo "$(( (1 + 2) ))"

      echo "$(( ((1+2)) ))"
      echo "$(( ((1 + 2)) ))"

      echo "$(((1+2)*3))"
      echo "$(((1 + 2) * 3))"
      echo "$(( (1 + 2) * 3 ))"

      echo "$((((1+2)*3)))"
      echo "$(( ((1 + 2) * 3) ))"
      echo "$(( ( (1 + 2) * 3 ) ))"

  - name: "Basic quoted arithmetic"
    stdin: |
      echo " 1  + 1 == $((1+1))"
      echo " 2  * 3 == $((2*3))"
      echo " 9  / 3 == $((9/3))"
      echo "10  % 3 == $((10%3))"
      echo " 2 ** 3 == $((2**3))"
      echo " 2  | 4 == $((2|4))"
      echo " 2  & 4 == $((2&4))"
      echo " 2  ^ 3 == $((2^3))"
      echo " 1 && 1 == $((1&&1))"
      echo " 1 && 0 == $((1&&0))"
      echo " 1 || 0 == $((1||0))"
      echo " 0 || 1 == $((1||0))"
      echo " 1  , 2 == $((1,2))"

  - name: "Unary operators"
    stdin: |
      echo "     -1 == $((-1))"
      echo "     +1 == $((+1))"
      echo "    ~10 == $((~10))"
      echo "    !10 == $((!10))"

  - name: "Conditional operator"
    stdin: |
      echo "1 ? 2 : 3 == $((1?2:3))"
      echo "0 ? 2 : 3 == $((0?2:3))"

  - name: "Arithmetic with spacing"
    stdin: |
      echo $(( 75 + 68 ))

  - name: "Divide by zero"
    ignore_stderr: true
    stdin: |
      echo "1 / 0 == $((1/0))"
      echo "Result: $?"

      echo "1 % 0 == $((1%0))"
      echo "Result: $?"

  - name: "Shift arithmetic"
    stdin: |
      echo "32 >> 2 == $((32>>2))"
      echo " 1 << 4 == $((1<<4))"

  - name: "Variable references"
    stdin: |
      x=10
      echo "x => $((x))"
      echo "x + 1 => $((x+1))"

      y=
      echo "y => $((y))"
      echo "y + 1 => $((y+1))"

      z=notnumber
      echo "z => $((z))"
      echo "z + 1 => $((z+1))"

  - name: "Complex variable references"
    stdin: |
      x=10
      y=20
      z=x+y
      a=z+z

      echo "z => $((z))"
      echo "a => $((a))"

  - name: "Nested expressions"
    stdin: |
      echo "1: $(($(echo -n 1; echo 2) + 37))"

      op="+"
      echo "2: $((10 ${op} 20))"

      expr="13 * 7"
      echo "3: $(($expr))"

  - name: "Assignment arithmetic"
    stdin: |
      x=0

      echo "x = 1 => $((x = 1))"
      echo "x is now $x"

      echo "x += 1 => $((x += 1))"
      echo "x is now $x"

      echo "x -= 1 => $((x -= 1))"
      echo "x is now $x"

      echo "x *= 2 => $((x *= 2))"
      echo "x is now $x"

      echo "x++ == $((x++))"
      echo "x is now $x"

      echo "++x == $((++x))"
      echo "x is now $x"

      echo "x-- == $((x--))"
      echo "x is now $x"

      echo "--x == $((--x))"
      echo "x is now $x"

  - name: "Assignment with references"
    stdin: |
      x=10+3
      echo "y = x => $((y = x))"
      echo "y is now $y"

  - name: "Assignments in logical boolean expressions"
    known_failure: false
    stdin: |
      x=0
      echo "0 && x+=1 => $(( 0 && (x+=1) ))"
      echo "x: $x"

      x=0
      echo "1 && x+=1 => $(( 1 && (x+=1) ))"
      echo "x: $x"

      x=0
      echo "0 || x+=1 => $(( 0 || (x+=1) ))"
      echo "x: $x"

      x=0
      echo "1 || x+=1 => $(( 1 || (x+=1) ))"
      echo "x: $x"

  - name: "Array arithmetic"
    stdin: |
      a=(1 2 3)
      declare -p a
      echo "a[0]: $((a[0]))"
      echo "a[2]: $((a[2]))"
      echo "a[3]: $((a[3]))"

      echo "b[2]: $((b[2]))"

      echo "a[1]=4 => $((a[1]=4))"
      echo "a[1]: $((a[1]))"

      echo "a[1]+=1 => $((a[1]+=1))"
      echo "a[1]: $((a[1]))"

      echo "c[1] += 3 => $((c[1] += 3))"

  - name: "Basic arithmetic comparison"
    stdin: |
      echo "0  < 1: $((0 < 1))"
      echo "0 <= 1: $((0 <= 1))"
      echo "0 == 1: $((0 == 1))"
      echo "0 != 1: $((0 != 1))"
      echo "0  > 1: $((0 > 1))"
      echo "0 >= 1: $((0 >= 1))"
      echo "0  < 0: $((0 < 0))"
      echo "0 <= 0: $((0 <= 0))"
      echo "0 == 0: $((0 == 0))"
      echo "0 != 0: $((0 != 0))"
      echo "0  > 0: $((0 > 0))"
      echo "0 >= 0: $((0 >= 0))"
      echo "1  < 0: $((1 < 0))"
      echo "1 <= 0: $((1 <= 0))"
      echo "1 == 0: $((1 == 0))"
      echo "1 != 0: $((1 != 0))"
      echo "1  > 0: $((1 > 0))"
      echo "1 >= 0: $((1 >= 0))"