/* AC 17/18
 * TPC2 Ex1
 */

#include <stdio.h>

unsigned F2U( float n ) {  // float to unsigned int
  return *(unsigned*)&n;
}

float U2F( unsigned n ) {  // unsigned int to float
  return *(float*)&n;
}

void printFloat( float val ) {
  unsigned int num = F2U( val );
  char sign;   // should be ' ' or '-'
  int exponent;
  float mantissa;

  if ( val<0 )
    sign = '-';
  else sign = ' ';

  exponent = (num>>23) & 0xff;
  exponent = exponent-127;
  mantissa = U2F((num & 0x07fffff) | (127<<23));

  printf("%c%f x2^%d\n", sign, mantissa, exponent);
}


int main( int argc, char *argv[] ) 
{
  float x;
  
  scanf( "%f", &x );
  printFloat(x);
  return 0;
}




/**************************************************************/
/* AC 17/18
 * TPC2 Ex2
 */

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

void arrayCopy( void *src, void *dst, int elemSize, int num ) {
    int n = elemSize*num;  // num de bytes a copiar
    char *d = (char*)dst;
    char *s = (char*)src;

    if ( src == dst || num == 0 ) return;

    if ( src < dst && src+n >= dst ) { // ha' overlap
       s = s+n-1;		// copiar de tras para a frente
       d = d+n-1;
       while ( n-- >0 )  // podia usar um for. Estude o que este while faz!
          *d-- = *s--;
    } 
    else
       for ( int i=0; i<n; i++ )  // desafio: reescreva com um while semelhante ao anterior
          d[i] = s[i];

}


int main() {    // programa de teste
    int v1[6] = { 1, 2, 3, 4, 5, 6 };
    int v2[5] = { 0, 0, 0, 0, 0 };
    char s1[] = "uma mensagem!";
    char s2[100] = "";

    arrayCopy( v1+2, v2, sizeof(int), 4 );
    for ( int i=0; i<5; i++ )
       printf("%d ", v2[i] );
    putchar('\n');

    arrayCopy( v1, v1+2, sizeof(int), 3 );
    for ( int i=0; i<6; i++ )
       printf("%d ", v1[i] );
    putchar('\n');

    arrayCopy( s1, s2, sizeof(char), strlen(s1)+1 );
    puts(s2);

    arrayCopy( s1+4, s1, sizeof(char), strlen(s1)-3 );
    puts(s1);

    return 0;
}