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void str_print( char *str )
{
int i;
for ( i = 0; i < strlen ( str ); i++ )
{
printf("%c"£¬str[ i ] );
}
}
void str_print1 ( char *str )
{
int len;
len = strlen ( str );
for ( i = 0; i < len; i++ )
{
printf("%c"£¬str[ i ] );
}
}
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for (j = 0; j < 30; j++)
{
for (i = 0; i < 10; i++)
{¡¡}
} // Àý×Ó 1-1
for (i = 0; i < 10; i++)
{
for (j = 0; j < 30; j++)
{¡¡}
} // Àý×Ó 2-2 ³ÌÐò²»¼ò½àµ«Ð§Âʸß
8¡¢Ìá¸ß switch Óï¾äµÄЧÂÊ
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switch (±í´ïʽ)
{
case Öµ1:
Óï¾ä1: break;
case Öµ2£º
Óï¾ä2£ºbreak;
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default:
switch (±í´ïʽ)
{
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case Öµm:
Óï¾äm: break;
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}
}
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sum = 100*(100+1)/2;
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±àÒëÇ°£º
while (1)£»
±àÒëºó£º
mov eax£¬1
test eax£¬eax
je foo+23h
jmp foo+18h
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for (;;)£»
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jmp foo+23h
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13¡¢Ê¹ÓÃMemoization£¬ÒÔ±ÜÃâµÝ¹éÖظ´¼ÆËã
¿¼ÂÇFibonacci(ì³²¨ÄÇÆõ)ÎÊÌ⣬FibonacciÎÊÌâÊÇ¿ÉÒÔͨ¹ý¼òµ¥µÄµÝ¹é·½·¨À´½â¾ö:
[plain] view plain copy print?
int fib ( n )
{
if ( n == 0 || n == 1 )
{
return 1;
}
else
{
return fib( n - 2 ) + fib ( n - 1 );
}
}
×¢:ÔÚÕâÀÎÒÃÇ¿¼ÂÇFibonacci ϵÁдÓ1¿ªÊ¼£¬Òò´Ë£¬¸ÃϵÁп´ÆðÀ´:1£¬1£¬2£¬3£¬5£¬8£¬¡
×¢Òâ:´ÓµÝ¹éÊ÷£¬ÎÒÃǼÆËãfib(3)º¯Êý2´Î£¬fib(2)º¯Êý3´Î¡£ÕâÊÇÏàͬº¯ÊýµÄÖظ´¼ÆËã¡£Èç¹ûn·Ç³£´ó£¬fibº¯ÊýµÄЧÂÊ»á±È½ÏµÍ¡£MemoizationÊÇÒ»¸ö¼òµ¥µÄ¼¼Êõ£¬¿ÉÒÔ±»ÓÃÔڵݹ飬¼ÓÇ¿¼ÆËãËٶȡ£fibonacci º¯ÊýMemoizationµÄ´úÂëÈçÏÂ:
[plain] view plain copy print?
int calc_fib ( int n )
{
int val[ n ] £¬ i;
for ( i = 0; i <=n; i++ )
{
val[ i ] = -1; // Value of the first n + 1 terms of the fibonacci terms set to -1
}
val[ 0 ] = 1; // Value of fib ( 0 ) is set to 1
val[ 1 ] = 1; // Value of fib ( 1 ) is set to 1
return fib( n £¬ val );
}
int fib( int n £¬ int* value )
{
if ( value[ n ] != -1 )
{
return value[ n ]; // Using memoization
}
else
{
value[ n ] = fib( n - 2 £¬ value ) + fib ( n - 1 £¬ value ); // Computing the fibonacci term
}
return value[ n ]; // Returning the value
}
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