We often encounter a situation where there are several parameters in main function, so how to use the executable file with parameter(s)?

Return Value and Parameters of Main Function

#include<stdio.h>
#include<stdlib.h>
#include<math.h>
int main(int argc, char* argv[]){
  if(argc!=3){
    printf("Bad argument!\n");
    return -1;
  }
  double a = atof(argv[1]);
  double n = atof(argv[2]);
  double result = pow(a,n);
  printf("result = %.2f\n",result);
  return 0;
}
**************************************
when I want ot use the .exe file
win+R -> cmd -> 
C:\Users\Administor>cd c:\
c:\>Mypower.exe 2.2 3
result = 10.65
That's a not bad message.

How do we use the return value of main function?

int ret=system("c:\\Mypower.exe 2.2 3");

So when any problems occur, we could supervise the status with variable ret.