Use arguments passed to a program from the command line

/* gcc -std=c11 -Wall -fmax-errors=10 -Wextra program.c -0 program

run: ./program -e 43 27.88 ...

run: ./program -x 43 27.88 ...
*/

#include <stdio.h>
#include <stdlib.h> // for atoi and atof
#include <string.h> // for strcmp

int main(int argc, char *argv[]){
	int i, compare, wholeNumber;
	double decimalNumber;
		
	printf("I have %d arguments from command line:\n",argc);
	for(i=0; i<argc; i++){
		printf("Argument %d: %s\n", i, argv[i]);
	}
	
	if(argc == 4){
		compare = strcmp(argv[1], "-e");
		if(compare == 0){
			printf("argv[1] equals -e \n");
		}else{
			printf("argv[1] does not equal -e \n");
		}
		wholeNumber = atoi(argv[2]);
		printf("%s as an integer is %d. \n", argv[2], wholeNumber);
		decimalNumber = atof(argv[3]);
		printf("%s as a double is %lf.\n", argv[3], decimalNumber);
	}

	return 0;
}