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

int main(void) {
	char userIn[100]; // declare a char array to hold string up to 100
	int userInLength;


	// User inputs text. Notice that there is an extra character or two
	// a new line '\n' = 10   and/or a carriage return '\r' = 13
	puts("Enter some text:");
	fgets(userIn, 100, stdin);
	puts("Echo. You input the string:");
	puts(userIn);
	userInLength = strlen(userIn);
	printf("Your text was %d characters long.\n", userInLength);
	puts("Here are the ascii codes in the array:");
	for (int i = 0; i < userInLength + 1; i++){
		printf("userIn[%d] = %d\n", i, userIn[i]);
	}


	//Meth.1: Correcting by over-writing with 0 by length subtraction
	char userInAgain[100];
	int inLengthAgain;
	puts("Test 2. Enter some text:");
	fgets(userInAgain, 100, stdin);
	//Correct for line return by trimming string length by 1 or 2.
	inLengthAgain = strlen(userInAgain);
	userInAgain[inLengthAgain - 1] = 0;
	//analyze - recalc. length
	puts("Echo. You input the string:");
	puts(userInAgain);
	inLengthAgain = strlen(userInAgain);
	printf("Your text was %d characters long.\n", inLengthAgain);
	puts("Here are the ascii codes in the array:");
	for (int i = 0; i < inLengthAgain + 1; i++){
		printf("userInAgain[%d] = %d\n", i, userInAgain[i]);
	}


	//Meth.2: Correcting by over-writing with 0 by searching for a line return
	char userInYetAgain[100];
	int inLengthYetAgain;
	puts("Test 3. Enter some text:");
	fgets(userInYetAgain, 100, stdin);
	//line return correction - search first then trim
	char* nlPointer = strchr(userInYetAgain, '\n'); // locate pointer to new line if it exists.
	if (nlPointer != NULL) *nlPointer = 0; // trim string back to line return if it is found.
	char* crPointer = strchr(userInYetAgain, '\n'); // locate pointer to carriage return if it exists.
	if (crPointer != NULL) *crPointer = 0; // trim string back to carriage return if it is found.
	//output string data
	puts("Echo. You input the string:");
	puts(userInYetAgain);
	inLengthYetAgain = strlen(userInYetAgain);
	printf("Your text was %d characters long.\n", inLengthYetAgain);
	puts("Here are the ascii codes in the array:");
	for (int i = 0; i < inLengthYetAgain + 1; i++){
		printf("userInAgain[%d] = %d\n", i, userInYetAgain[i]);
	}


	//Meth.3: Correcting by trimming in while loop - 'proper trim'
	char userInLast[100];
	int inLengthLast;
	puts("Test 4. Enter some text:");
	fgets(userInLast, 100, stdin);
	// todo correct with loop.
	inLengthLast = strlen(userInLast);
	char lastChar = userInLast[inLengthLast - 1];
	while (lastChar == '\n' || lastChar == '\r' || lastChar == ' ' || lastChar == '\t'){
		userInLast[inLengthLast - 1] = 0;
		inLengthLast = strlen(userInLast);
		lastChar = userInLast[inLengthLast - 1];
	}
	//output string data
	puts("Echo. You input the string:");
	puts(userInLast);
	inLengthLast = strlen(userInLast);
	printf("Your text was %d characters long.\n", inLengthLast);
	puts("Here are the ascii codes in the array:");
	for (int i = 0; i < inLengthLast + 1; i++){
		printf("userInLast[%d] = %d\n", i, userInLast[i]);
	}

	return 0;
}