//Revision Lecture 17: Strings
//Sasha Vassar Week10 

//Problem 1: Read in a string from terminal and reverse the characters
//in the string

//Can you now read in from command line and reverse the characters?


#include <stdio.h>
#include <string.h>

#define MAX 100

int main(int argc, char *argv[]) {
    
    /*char line[MAX];
    printf("Enter a word: ");
    fgets(line, MAX, stdin);
    */
    
    //./reverse hello
    //argc = 2
    // argv[0] = ./reverse
    // argv[1] = hello
    // argv[1][0] = 'h'
    // argv[1][1] = 'e'
    int size = strlen(argv[1]);
    //size = 5
    // line[0] = h, line[1] = e, line[2] = l, line[3] = l, line[4] = o, '\n' line[5] = '\0'
    char reversed_string[MAX];
    
    int i = size - 1; //4
    int j = 0;
    while (i >= 0) {
        reversed_string[j] = argv[1][i];
        j++;
        i--;
    }
    reversed_string[size] = '\0';
    
    printf("The string is %s.\n", argv[1]);
    printf("The reversed string is %s.\n", reversed_string);

    return 0;
}