In C++ Print the string “hello world” using a function and pointer.
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In C++ Print the string “hello world” using a function and pointer.
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- C++ Create a program that reads a simple arithmetic expression and evaluates it. More precisely, the program reads from the user a line of text that’s supposed to contain two numbers separated by an arithmeticoperator, as in: 35.6 + 12 The program then prints back the expression and its value, as in: 35.6 + 12 = 47.6 The program should verify that the input line contains two numbers, one operator and nothing else. There can be whitespace before the first number, after the second number and between each number and the operator.The operator can be either +, −, *, or /. In case of an error, the program should print: "Invalid expression" and quit.When the program prints the expression, there should be no whitespacebefore the first number and there should be exactly one blank space beforeand after the operator and the equal sign.Use string streams.In C++, Given the following mystery function, what is the output if the number passed to the function is 7: int mystery(int number) { if (number == 0 || number == 1) return number; else return mystery(number - 1) + mystery(number - 2); }C programming