A_141205_CADENAS, C (gcc)

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//Title of this code

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

int main(void)
{
    char cad1[100];
    char cad2[100];
    char cad3[100];
    char cad4[100];
    short i, j;
    
    printf("Cadena ... "); gets(cad1);
    
    printf("Longitud de la cadena: %hd\n", strlen(cad1));
    for(i = 0 ; cad1[i] != 0 ; i++);
    printf("Longitud de la cadena: %hd\n", i);
    
    strcpy(cad2, cad1);
    
    printf("Cadena1: %s\n", cad1);
    printf("Cadena2: %s\n", cad2);
    
    for(i = j = 0 ; cad1[i] ; i++)
    {
        if(isalnum(cad1[i])) 
        {
            cad3[j++] = toupper(cad1[i]);
        }
    }
    cad3[j] = 0;
    
    printf("Cadena3: %s\n", cad3);
    
    for(i = 0 ; cad3[i] ; i++) 
    {
        cad4[i] = cad3[strlen(cad3) - 1 - i];
    }
    cad4[i] = 0;
    printf("Cadena4: %s\n", cad4);
    
    if(strcmp(cad3, cad4) == 0)
    {
        printf("SÍ ES PALÍNDROMO\n\n");
    }
    else
    {
        printf("NO ES PALÍNDROMO\n\n");
    }

return 0;
}

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Compilation time: 0.12 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0.36 sec