To open a file with a user supplied name, you would need to store the name in a variable. if the file name was to have no more than 20 characters in it, which would be an appropriate declaration of the file name variable?
a. char filename;
b. char filename(20);
c. char filename[20];
d. char filename[21];

C: char filename[20];

Explanation:

In c++ the squre brackets or simply brackets "[]" is used to denote memory allocation, memory access and so on,

create an interactive presentation of ms powerpoint or any other presentation software in which define the product's characteristics, benefits, why people consider it, etc.