C++ simple answer

(CStrings 1) Write a function that finds the number of occurrences of a specified character in a C-string using the following header: int count (char s[], char a) Write a test program that reads a string and a character and displays the number of occurrences of the character in the string Here is an example nter a string: Hello world. I 1ike the sunshine. nter a character:e appears in Hello world. I like the sunshine. 4 times (CStrings 2) Write a function that converts a binary number into decimal. Write a program that uses this function after asking the user to enter a string. nter a bianry number: 11011 54 (CStrings 3) Write a function that given two strings s1 and s2 checks if s1 is a substring of s2. The function should return -1 if s1 is not a substring of s2 and the position in s2 where s1 starts. Write a main program that uses this function after asking the user to enter the two strings Here is an example nter the first string: meter nter the second string: parameter ndexof("meter, "parameter) is 4