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In OCaml, there are different arithmetic operators for floats and integers. Additionally, these operators can only be used on 2 floats or 2 integers. Here are invalid expressions in OCaml

```
1.0 + 2.0
1 + 2.0
1 +. 2
1 +. 2.0
```

The correct expression for each of these respectively are

```
1. +. 2.
float_of_int 1 +. 2.
1 + 2
float_of_int 1 +. 2.
```

There is no automatic casting of integers to floats or vice-versa in OCaml. Everything is explicit. Here is a list of the integer and float operators

Operation | Integer Operator | Float Operator |
---|---|---|

Addition | `a + b` | `c +. d` |

Subtraction | `a - b` | `c -. d` |

Multiplication | `a * b` | `c *. c` |

Division | `a / b` | `c /. d` |

Modulus | `a mod b` | `modfloat c d` |

Exponentiation | N/a | `c ** d` |

Where `a`

and `b`

are integers and `c`

and `d`

are floats.