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Computer Programming Problems and Solutions with the PHP Language

1. Basic Output
2. Variables
3. Basic Input
4. Comment
5. Arithmetic Operation
6. Loops
7. Condition (If/Else)
8. Condition (Switch )
9. Function/Method
10. Array/List

1. Write a program that accepts two numbers and find the sum.
2. Write a program that accepts two numbers and perform all arithmetic operations.
3. Write a program that accepts length and width of rectangle to find area.
4. Write a program that accepts radius of a circle and find its diameter, circumference, and area.
5. Write a program that accepts that accepts temperature in Celcius and convert it to Farenheit.
6. Write a program that checks a number input is even or odd.
7. Write a program that finds the sum of all numbers from 1 to 20.
8. Write a program that outputs all numbers divisible by 5 from 1 to 30.
9. Write a program that accepts a number and outputs 1 to the input (1 to n).
10. Write a program that accepts three numbers and outputs their average.
11. Write a program that concatenates two words.
12. Write a program that asks a user for their name and outputs a greeting with their name.
13. Write a program that outputs the length of the string.
14. Write a program that replaces all letter 'a' in a string with letter 'e'
15. Write a program that finds if a string is within a string.
16. Write a program that compare two strings.
17. Write a program that outputs the index of the first occurence of the letter in a string.
18. Write a program that outputs the frequency of a letter in a string.
19. Write a program that counts the total number of vowels in a string.
20. Write a program that checks if a string is a palindrome.

1. Write a program that prints the numbers from 1 to 50. Output "Fizz" for multiples of 3, output "Buzz" for multiples of 5, and bot "FizzBuzz" for multiples of both 3 and 5.
2. Write a program that outputs 5 random integers.
3. Write a program that count letters in a string using a loop.
4. Write a program that outputs an asterisk pyramid.
5. Write a program that outputs all even numbers below 20.
6. Write a program that outputs all odd numbers below 20.
7. Write a program that outputs the sum of numbers from 1 to n.
8. Write a program that counts vowels in a string.
9. Write a program to display the multiplication table of a given integer.
10. Write a program to check whether a given number is an Armstrong number or not.
11. Write a program that checks if a number is palindrome.
12. Calculate the Product of two numbers WITHOUT using the * operator.
13. Write a program that reverses a string.
14. Write a program that accepts 5 numbers and outputs the average.
15. Write a program that will ask the user to input n positive numbers. The program will terminate if one of those number is not positive.
16. Write a program that outputs the factorial of a number.
17. Write a program that outputs the Fibonacci sequence of a number.
18. (Recursion) Write a program that outputs the Fibonacci sequence of a number.
19. (Recursion) Write a program that outputs all even numbers below 20.
20. (Recursion) Write a program that outputs the sum of numbers from 1 to n.

1. Write a program that outputs the length of array.
2. Write a program that gets the index of an element in an array.
3. Write a program that counts the occurence of an element in an array.
4. Write a program that outputs the first and last elements of an array.
5. Write a program that outputs array using loops.
6. Write a program that checks if an array contains an element.
7. Write a program that finds the largest number in an array.
8. Write a program that finds the lowest number in an array.
9. Write a program that outputs the sum of an array.
10. Write a program that outputs the average of an array.
11. Write a program that reverses an array of integer values.
12. Write a program that compares two arrays.
13. Write a program that outputs all even numbers in an array.
14. Write a program that outputs all odd numbers in an array.
15. Write a program that copies values of an array to another array.
16. Write a program that deletes an element in an array.
17. Write a program that inserts an element in an array.
18. Write a program that sorts an array in descending order.
19. Write a program that combines two arrays.
20. Write a program that outputs the element closest to 0.

1. Write a program that converts a number to string.
2. Write a program that converts a string to integer.
3. Write a program that converts an integer to float.
4. Write a program that converts a string to array/list.
5. Write a program that converts an array/list to string.
6. Write a program that converts a binary number to decimal number.
7. Write a program that converts a decimal number to binary number.
8. Write a program that converts a decimal number to hexadecimal number.
9. Write a program that converys a hexadecimal number to decimal number.
10. Write a program that converts a decimal number to octal number.
11. Write a program that converts numbers of day to minutes.
12. Write a program that converts numbers of day to seconds.
13. Write a program that converts celsius to farenheit.
14. Write a program that converts lower case to upper case characters.
15. Write a program that converts letters to ASCII.
16. Write a program that converts feet to inch.
17. Write a program that converts kilometer to meter.
18. Write a program that converts liter to milliliter.
19. Write a program that converts numbers to words.
20. Write a program that converts a number to its corresponding month (e.g. 1 = January).

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