practice problems on functions IN SWIFT

1. Practice problems on functions
1. Write a Swift program to compute the sum of the two integers. If the values are equal return the
triple their sum.
2. Write a Swift program to compute and return the absolute difference of n and 51, if n is over 51
return double the absolute difference
3. Write a Swift program that accept two integer values and return true if one of them is 20 or if
their sum is 20.
4. Write a Swift program to accept two integer values and return true if one is negative and one is
positive. Return true only if both are negative.
5. Write a Swift program to add "Is" to the front of a given string. However, if the string already
begins with "Is", return the given string.
6. Write a Swift program to remove a character at specified index of a given non-empty string. The
value of the specified index will be in the range 0..str.length()-1 inclusive
7. Write a Swift program to change the first and last character of a given string.
8. Write a Swift program to add the last character (given string) at the front and back of a given
string. The length of the given string must be 1 or more.
9. Write a Swift program to check if a given non-negative number is a multiple of 3 or a multiple of 5.
10. Write a Swift program to take the first two characters from a given string and create a new string
with the two characters added at both the front and back.
11. Write a Swift program to test a given string whether it starts with "Is". Return true or false.
12. Write a Swift program that return true if either of two given integers is in the range 10..30
inclusive.
13. Write a Swift program to check if a given string begins with "fix", except the 'f' can be any
character or number.
14. Write a Swift program to find the largest number among three given integers.
15. Write a Swift program that accept two integer values and to test which value is nearest to the
value 10, or return 0 if both integers have same distance from 10.
16. Write a Swift program that accept two integer values and test if they are both in the range 20..30
inclusive, or they are both in the range 30..40 inclusive.
17. Write a Swift program that accept two positive integer values and test whether the larger value
is in the range 20..30 inclusive, or return 0 if neither is in that range.
18. Write a Swift program to test whether the last digit of the two given non-negative integer values
are same or not.
19. Write a Swift program to convert the last three characters in upper case. If the string has less
than 3 chars, lowercase whatever is there.
20. Write a Swift program to check if the first instance of "a" in a given string is immediately
followed by another "a".

2. 21. Write a Swift program to create a string made of every other char starting with the first from a
given string. So "Python" will return "Pto"
22. Write a Swift program to count the number of 7's in a given array of integers.
23. Write a Swift program to check if one of the first 4 elements in a given array of integers is a 7.
The length of the array may be less than 4.
24. Write a Swift program to test if the sequence of numbers 0, 1, 2 appears in a given array of
integers somewhere.
25. Write a Swift program to create a new string where all the character "a" have been removed
except the first and last positions.
26. Write a Swift program to create a string taking characters at indexes 0, 2, 4, 6, 8, .. from a given
string
27. Write a Swift program to count the number of times that two 7's are next to each other in a
given array of integers.
28. Write a Swift program to test whether a value presents sequentially three times in an array of
integers or not.