Ejemplo025.c

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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
 
#define BIT(n)              (1<<(n))
#define BIT_GET(x,n)        ((x) & BIT(n))
#define BIT_SET(x,n)        ((x) |= BIT(n))
#define BIT_CLEAR(x,n)      ((x) &= ~BIT(n))
#define BIT_TOGGLE(x,n)     ((x) ^= BIT(n))
#define BIT_WRITE(x,n,v)    ((v)?BIT_SET(x,n):BIT_CLEAR(x,n))
#define ES_PAR(x)           (!BIT_GET(x,0))
#define N 50
 
int main(int argc, char *argv[])
{
    char str[N], c, p, v;
    int i, nc, cc, cb;
    srand(time(NULL));
    i = 0;
    do{
        c = getchar();
        str[i] = c;
        i++;
    }while(c!=10&&i<(N-1));
    nc = i-1;
    str[nc] = '\0';
    p = 0;
    i = 0;
    while(str[i]!='\0')
    {
        p^=str[i];
        i++;
    }
    printf("%s (%d)\n", str, p);
    cc = (rand()%nc);
    cb = (rand()%8);
    BIT_TOGGLE(str[cc],cb);
    v = p;
    i = 0;
    while(str[i]!='\0')
    {
        v^=str[i];
        i++;
    }
    printf("%s (%d, %d, %d)\n", str, v, cc, cb);
    return 0;
}