C/C++ :: Structure Competitor - List Of Contestants

This is structure:

structure competitor {
int password;
string last_name;
string first_name;
float score;
};

Write a program that processes the list of contestants on the competition,during the work program, the program offers an appropriate menu:

1.Enter new competitor;
2.Remove competitor with password;
3.Change data competitor with password;
4.Sort competitors in descending order of score;
5.Tabulation of rank list;
6.Writing data to a text file;
7.Download data from a text file;
8.End of the program.

Each of the individual actions realised with appropriate function. Use precision of two decimal places