#include "stopif.h"#include <stdlib.h> //strtod#include <math.h> //powintmain(intargc,char**argv){Stopif(argc<2,return1,"Give me a number on the command line to square.");char*end;doublein=strtod(argv[1],&end);Stopif(*end,return2,"I couldn't parse '%s' to a number. ""I had trouble with '%s'.",argv[1],end);printf("The square of %g is %g\n",argv[1],pow(in,2));}