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- Practice
- C++
- Introduction
- Functions

# Functions

# Functions

Functions are a bunch of statements glued together. A function is provided with zero or more arguments, and it executes the statements on it. Based on the return type, it either returns nothing (void) or something.

A sample syntax for a function is

```
return_type function_name(arg_type_1 arg_1, arg_type_2 arg_2, ...) {
...
...
...
[if return_type is non void]
return something of type `return_type`;
}
```

For example, a function to read four variables and return the sum of them can be written as

```
int sum_of_four(int a, int b, int c, int d) {
int sum = 0;
sum += a;
sum += b;
sum += c;
sum += d;
return sum;
}
```

You have to write a function *int max_of_four(int a, int b, int c, int d)* which reads four arguments and returns the greatest of them.

```
+= : Add and assignment operator. It adds the right operand to the left operand and assigns the result to the left operand.
a += b is equivalent to a = a + b;
```

**Input Format**

Input will contain four integers - , one in each line.

**Output Format**

Print the greatest of the four integers.

*PS:* I/O will be automatically handled.

**Sample Input**

```
3
4
6
5
```

**Sample Output**

```
6
```