Project-Scylla/KNR C/ex1_10_goto.c

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

/*A really silly way to complete exercise 1-10 of KNR C*/

int main(){

	int a = getchar(); /*There is, unfortuately, no immediately obvious way to avoid repeating this since we need to initialize 'a' in order to have valid data for everything beyond this line*/

	if (a == EOF){ /*Check whether first character is EOF*/
		printf ("Error: No data to parse. \n Exiting.");
		EXIT_FAILURE; /*Exit if there is no data to parse.*/
	}

loop_start: /*Goto will circle back to the next line if a != EOF*/
	if (a == '\t' || a == '\b' || a == '\\'){
		if (a == '\t')
			printf("\\t");
		if (a == '\b')
			printf("\\b");
		if (a == '\\')
			printf ("\\\\");
	} else {
		putchar(a);
	}

	a = getchar();

	if (a != EOF) /*Only trigger next loop if 'a' contains valid data.*/
		goto loop_start;


	return 0;
}