grep.c Write a program that takes a string as a command-line argument and then reads from stdin until the user closes stdin (with ctrl-d). It should print every line that contains the given string. It should be case-sensitive by default, but case-insensitive if the command line option -i is given before the string. ./grep ello # input # output # input, ignored since it doesn't contain "ello" Hello there Hello there Hi there The sun is yellow # input The sun is yellow # output # input, ignored since "ello" is case-sensitive # close stdin YELLOW "D ./grep -i ello Hello there # input # output # input # output Hello there YELLOW YELLOW "D # close stdin

Complete the function given below:  int square (int x) { // Return square of x } C++ language.

Mention how to utilise Python's split function.

Make C++ program.Your travel agency offers trips to Asian and African countries. This month, you are specifically doing trips to the Philippines (in Asia) and Tunisia (in Africa) and created a program for users to get prices and a boarding ticket. For all Asian countries, you store the name and population information in your program. With African countries, in addition to the name and population, you are also interested in location (North, South, East, West). Create an abstract Country class that holds the country name and population (given by the constructor). There should be two functions: int get_ticket_price and void_print_boarding_pass (which will output a boarding pass as a file-see below)  Using the Country class, create two classes called African_country and Asian_country. The Asian_country class should use the same constructor that the Country class uses and the African_country class constructor should allow for the user to enter the location (see sample run).…