Arguments in main

#1

I wanted to know that why we have given arguments to the main function in this code and where are they getting used.

#2

int argc,char const *argvc[] are used to take input from command line. These are command line arguments.
while executing the c/c++ program,
./a.out --insert inputs here–
where argc would store the count of arguments, and argcv[] would contain the arguments,
You can use them in your code as well.
for example:
./a.out 45
in your c program : int a = atoi(argv[1]); a would contain 45

#3

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#4

if i run the program without these it will still run right?