Write a function that returns the sum of two numbers.

Example
For `param1 = 1` and `param2 = 2`, the output should be
`add(param1, param2) = 3`.
Input/Output

• [execution time limit] 4 seconds (php)
• [input] integer param1Guaranteed constraints:
`-1000 ≤ param1 ≤ 1000`.
• [input] integer param2Guaranteed constraints:
`-1000 ≤ param2 ≤ 1000`.
• [output] integer
• The sum of the two inputs.
```function add(\$param1, \$param2) {
return \$param1 + \$param2;
}
```

## centuryFromYear

Given a year, return the century it is in. The first century spans from the year 1 up to and including the year 100, the second – from the year 101 up to and including the year 200, etc.

Example

• For `year = 1905`, the output should be
`centuryFromYear(year) = 20`;
• For `year = 1700`, the output should be
`centuryFromYear(year) = 17`.

Input/Output

• [execution time limit] 4 seconds (php)
• [input] integer yearA positive integer, designating the year.Guaranteed constraints:
`1 ≤ year ≤ 2005`.
• [output] integer
• The number of the century the year is in.
```function centuryFromYear(\$year) {
return intdiv(\$year, 100) + (\$year % 100 ? 1 : 0);
}```

Explanation
intdiv with 100 will give us the first 2 digits of the year. If the last two digits are more than 00 than we are in the next century, so add 1.

## checkPalindrome

Given the string, check if it is a palindrome.

Example

• For `inputString = "aabaa"`, the output should be
`checkPalindrome(inputString) = true`;
• For `inputString = "abac"`, the output should be
`checkPalindrome(inputString) = false`;
• For `inputString = "a"`, the output should be
`checkPalindrome(inputString) = true`.

Input/Output

• [execution time limit] 4 seconds (php)
• [input] string inputStringA non-empty string consisting of lowercase characters.Guaranteed constraints:
`1 ≤ inputString.length ≤ 105`.
• [output] boolean
• `true` if `inputString` is a palindrome, `false` otherwise.
```function checkPalindrome(\$inputString) {
return \$inputString == strrev(\$inputString);
}```
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