Use str as a variable to store value.
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create a state variable and initialised it with 10 and then you have to create a function returnStateVariable( ) which returns the value of the created state variable.
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create a local variable and initialised it with 20 and then you have to create a function returnLocalVariable( ) which returns the value of the created local variable.
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Create a state variable of uint type (need not to be public).
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Create a set ( ) and with one argument. And set the value of the created state variable with the value passed as an argument to the set ( ).
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Then create another function get ( ) which returns the value of the state variable.
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Create a function evaluate(int a , int b).
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Subtract the difference of a and b from the sum of a and b.
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Return the result of the above task from the evaluate()
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Create a function find(int a). Where a>0.
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Return the remainder when a is divided by 3.
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Create a function average(int a,int b,int c). Where a>0,b>0,c>0.
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Return the average of a,b and c.
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Create a function digitSum(int n). Where n>0.
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Return the sum of digit for n.
For Example - If n=345 then digitSum() must return 12 i.e. 3+4+5 = 12
If n=909 then digitSum() must return 18 i.e. 9+0+9 = 18
There is a series, S , where the next term is the sum of pervious three terms. Given the first three terms of the series, a ,b ,c and respectively, you have to output the nth term of the series using recursion.
S(n) = a for n=1
S(n) = b for n=2
S(n) = c for n=3
S(n) = S(n-1) + S(n-2) + S(n-3) for n>3
- Create a function nthTerm(uint n, uint a, uint b, uint c) where n is the nth term to find and a,b,c are the three terms of the series.
A prime number is a whole number greater than 1. It has exactly two factors, that is, 1 and the number itself.
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Create a function prime(uint n) . This prime() will check whether n is a prime number or not.
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If n is a prime number then prime() returns 1 and n is not prime then prime() must return 0.
For Example - If n=103 then prime() must return 1 as 103 is a prime number. If n=200 then prime() must return 0 as 200 is not a prime number.
If y is a positive integer and x is any real number, then x^y corresponds to repeated multiplication x^y=x×x×⋯×x y times. We can call this “x raised to the power of y,” “x to the power of y,” or simply “x to the y.” Here, x is the base and y is the exponent or the power.
- Create a function power(uint x,uint y) . This power() will calculate x raised to the power of y and return it.
For Example - If x=2 y=3 then power() must return 8 (2x2x2=8) If x=7 y=2 then power() must return 49 (7x7=49)
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Create a function palindrome(uint n) . Thispalindrome() will check whether n is a palindrome or not.
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If n is a palindrome then palindrome() returns 1 and n is not palindrome then palindrome() must return 0.
- Create a function reverseDigit(uint n) . This reverseDigit() will do the reversal of the number n.
For Example - If n=123 then reverseDigit() must return 321. If n=5342 then reverseDigit() must return 2435.
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Create a function reverseArray(array, length of array).
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This reverseArray() will take two arguments - a dynamic uint type array and length of the array.
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The reverseArray() will reverse the array.
For Example - If array =[2,5,9,11,1] then reverseArray() will return [1,11,9,5,2] If array =[90,20,30,10] then reverseArray() will return [10,30,20,90]
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Create a function even(array, length of array).
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This even() will take two arguments - a dynamic uint type array and length of the array.
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The even() will multiply each element of array with 2.
For Example - If array =[2,5,11,1] then even() will return [4,10,22,2,] If array =[1,3,5,7] then even() will return [2,6,10,14]
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Create a function sort(array, length of array).
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This sort() will take two arguments - a dynamic uint type array and length of the array.
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The sort() will sort the array elements in ascending order.
For Example - If array =[2,5,9,11,1] then sort() will return [1,2,5,9,11] If array =[90,20,30,10] then sort() will return [10,20,30,90]
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Create a function distinct(array, length of array).
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This distinct() will take two arguments - a dynamic uint type array and length of the array.
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The distinct() will return the number of distinct elements in an array.
For Example - If array =[4, 2, 3, 4] then distinct() will return 3. If array =[1, 1, 1] then distinct() will return 1.
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Create a function search(array, length of array,element to search).
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This search() will take three arguments - a dynamic uint type array, length of the array, element that we need to search.
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The search() will search an element in an array.
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If element is found then it will return 1 otherwise 0.
For Example - If array =[4, 2, 3, 4] search element = 2 then search() will return 1. If array =[1, 2, 3] search element = 4 then search() will return 0.
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Create a function sumarray(array, length of array).
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This sumarray() will take two arguments - a dynamic int type array and length of the array.
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The sumarray() will add all elements of an array.
For Example - If array =[4, 2, 3, 4] then sumarray() will return 13 i.e. 4+2+3+4 = 13 If array =[1, 2, 3] then sumarray() will return 6 i.e. 1+2+3 = 6
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Find the sum of the series 1 + x + x^2+ x^3+ .. + x^n
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Create a function expression(x,n).
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The expression() will find the sum of the above expression.
For Example - If x =2 n = 3 then expression() will return 13. If x =5 n = 1 then expression() will return 6.
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Create a function secondMax(array, length of array).
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This secondMax() will take two arguments - a dynamic int type array and length of the array.
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The secondMax() will find the second largest element in an array.
For Example - If array =[40, 12, 31, 6] then secondMax() will return 31. If array =[9, 122, 37, 54] then secondMax() will return 54.
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Create a function hcf(num1,num2).
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This hcf() will take two arguments uint type number1 and number2.
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The hcf() will find the Highest Common Factor of number1 and number2.
For Example - If num1 = 60 num2 = 75 then hcf() will return 15.
If num1 = 31 and num2 = 23 then hcf() will return 1.
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Create a structure -> struct Book { string title; string author; uint256 book_id; }
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Create two functions:
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a) setBook(title(string), author(string) id(uint)) To set the book title, author and id given in the structure.
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b) getBook() - To get the book title,author and id.
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Create a structure -> struct Book { string title; string author; uint256 book_id; }
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Create "Book type" dynamic array. This "Book type" array will contain different types of Book.
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Create a counter( initialised by 1) which increases every time when a Book is added to the "Book type" array.
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This counter will act as an id for the Books added in the "Book type" array.
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Every Book in the "Book type" array will have a unique id.
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Create two functions a) setBook(title(string),author(string),id(uint)) - To set the book title, author and id given in the "Book type" array.
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b) getBook(id(uint)) - To get the book title,author and id of the Book whoose id is passed as an argument.
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Create a structure -> struct Student { string name; uint256[3] marks; }
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Create two functions a) set(name of student, marks in maths,marks in science,marks in english) - To set the name and marks of a student in marks array.
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b) get() - To get the name,marks in maths,marks in science and marks in english of the student.
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Create a variable of enum type.
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Create a function setLarge(). This will set the value of the enum type variable (created at step 1) with LARGE.
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Create a function getChoice() which will return the value of the enum type variable (created at step 1).
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Create a constructor() to hold the address of the owner. [Hint: use msg.sender]
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Create a function returnOwner() which returns the address of the owner. This returnOwner() can only be called by the owner (that we set using constructor()).
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If some other address tries to call this returnOwner() it should revert with this statement "You are not the owner".
Using a mapping, store balances of user addresses and define a setter and getter function. Note a user can only fetch their own balance.
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Create a mapping(address => uint256).
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Create a function updateBalance(balance to update).
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This updateBalance() will take one argument - a uint type variable.
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This function will update the balance of the address who has called this updateBalance().
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Create a function checkBalance(address of a user).
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This checkBalance(address user)() will take one argument - a address type variable.
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This function will return the balance of the user who has called this function.
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With this function user can only check his/her own balance only.
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If the user tries to check some other address balance the checkBalance() should revert with "You are not the owner of the account".
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For example - 0x123 address can check his own balance only.
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If 0x123 tries to check the balance of 0xab1 then the checkBalance() will revert with "You are not the owner of the account"
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Create a constructor() to set the owner of contract . [Hint: use msg.sender].
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Create a payable function send(address type array for storing addresses, uint type array to store the amount).
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The send() can only be called by owner of the contract.
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Check whehter the length of the address array is equal to length of the amount array. If not revert with "to must be same length as amount".
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If the length of both array are equal. Then it will transfer the amount from the amount array to the address array in such a way address at ith index of address array receives the amount at ith index of amount array.
For Example - If address array =[0x412, 0x2ab, 0x3de] and amount array = [10,5,90] then send() will transfer amount 10 to address 0x412 , amount 5 to address 0x2ab, amount 90 to address 03de.
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Create an array(address type) which stores only 16 elements.
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getTeamPlayers() - To return the entire array elements.
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selectJerseyNumber() - It will take only one argument of uint type and returns the players address from the array created above. a) The argument passed into the function must be greater than equal to zero and less than equal to 15.
- concatenate ( ) - This function will take two arguments i.e string 1 and string 2. It will concatenate string 1 and string 2 and will return the concatenated string.