commit 78f23ef2d0f89275f45a19803fa34933a4133398
parent 9bed6e73c3bc2805b4c31f6905fa45bb16d10657
Author: Martin J. Klöckner <martin.cachari@gmail.com>
Date: Tue, 24 Nov 2020 22:21:39 -0300
Improved ex18.c source code, commented & unnecesary lines removal.
Diffstat:
1 file changed, 19 insertions(+), 17 deletions(-)
diff --git a/95.11/guia03/ex18.c b/95.11/guia03/ex18.c
@@ -1,3 +1,6 @@
+// Reads a string of chars from stdin and check if it's
+// a palindrome.
+
#include <stdio.h>
#include <ctype.h>
#include <string.h>
@@ -13,42 +16,41 @@ int main ( void ) {
if(fgets(str, MAX_LEN, stdin) == NULL)
return 1;
-// Pasa todo a minuscula;
+// Converts all the string to lowercase;
for(i = 0; str[i] != '\0'; i++)
if(isupper(str[i]))
str[i] = tolower(str[i]);
-// En caso de ser una oracion elimina los espacios en blanco;
+// If the readed string it's a sentence erases all
+// the blank spaces;
for(i = 0; str[i] != '\0'; i++) {
if(str[i] == ' ') {
aux = i;
- while(str[i] != '\0') {
- str[i] = str[i + 1];
- i++;
+ while(str[aux] != '\0') {
+ str[aux] = str[aux + 1];
+ aux++;
}
- i = aux;
}
}
-// Asigna a i el valor de el ultimo caracter;
+// Counts the length of the string;
for(i = 0; str[i] != '\n'; i++)
;
-// Le restamos uno a i, ya que en la parte anterior
-// i es el indice de el caracter '\n';
+// We subtract one from i because of the '\n' char;
i = i - 1;
-// Esta parte compara uno a uno los caracteres;
-// primero con ultimo, segundo con anteultimo y
-// asi sucesivamente;
+// This part compares one by one the chars from the
+// string, first with last, second with before last,
+// and so on, only comparing the next one if the previous
+// one was equal;
for(j = 0; (str[j] == str[i]) && (str[j] != '\0'); j++, i--)
;
-// Si la cadena es efectivamente capicua entonces
-// en la parte anterior j tiene que haber recorrido toda
-// la cadena, ya que si los caracteres no eran iguales
-// j no se incrementa, si la cadena es capicua entonces,
-// j termino valiendo el largo de la cadena;
+
+// If the string or sentence its palindrome, then in the previous
+// block j would end with the value of the total lengh, minus one
+// because of the last char;
if(j == (strlen(str) - 1))
printf("La cadena es capicua.\n");
