Final answer:
The question involves writing a C program to define a structure for city information, read from a file into an array of structures, and display a menu for interaction.
Step-by-step explanation:
The student's question pertains to writing a C program that stores city information within structures and reads this data from a file into an array of these structures. The format mentioned indicates a mix of data types, namely doubles and a C-string, which suggests each structure will hold at least two double variables for numerical values and a char array or string for textual data. After reading the data into the array, the program is expected to display a menu to interact with this data. A typical approach to this type of problem would include defining a struct with fields to hold the corresponding data types, writing a function to read each entry from the file and store it in the struct array, and implementing a menu system for user interaction.
In this program, a structure is defined to store city information. The program reads a file and stores the data into an array of structures. After reading the file, the program displays a menu. The file format consists of two double values and a C-string.