Write a function substr() that will scan a string for the occurrence of a give substring. the prototype of the function would be:

char *substr(char *string1,char string2);

The function should return a pointer to the element in string1 where strig2 begins. If string2 doesn’t occur in string1 then substr() should return a NULL.

For example, if string1 is “Ena Meena Deeka”, and string2 is “Meena” the substr() should return address of ‘M’ in string1. 

Write main() function also that uses the function substr().

What is the advantage of passing arguments by reference? When and why is passing an object by reference preferable? 

Write a function having this prototype:

int replace(char *s,char c1,char c2); Have the function replace every occurrence of c1 in the string s with c2, ad have the function return the number of replacements it makes.

Given here is a structure defilation:

struct Box {  char maker[21];

float height,width,length,volume;

};

Write a function that passes the address of a Box structure and that sets the volume member to the product of the other three dimensions.

C++ lets you pass a structure by value and it lets you pass the address of a structure. If sample is a structure variable, how would you pass it by value? How would you pass its address? Which method do you think is better?

Imagine a publishing company that markets both books and audio-cassette versions of its works. Create a class called Publication that stores the title (a string) and price of a publication. From this class derive two classes: Book, which adds a page count (type int); and Tape, which adds a playing time in minutes (type float). Each of the three class should have a getdata() function to get its data from the user at the keyboard, and a putdata() function to display the data. Write a main() program that creates an array of pointers to Publication. In a loop, ask the user for data about a particular book or Tape, and use new to create a object of type Book or Tape to hold the data. Put the pointer to the object in the data for all books and tapes, display the resulting data for all the books and taps entered, using a for loop and a single statement such as

pubarr[i]->putdata();

to display the data from each object in the array.

Suppose 7 names are stored in a array of pointers names[] as shown below:

char *names [ ]= { “Anand”,”Naureen”,”Banjot”,”Wahid”,”sheena” }; 

Write a program to reverse the order of these names.