P.S. 1在這題屬於質數。
[C](0.012)
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#include<stdio.h> | |
#include<ctype.h> | |
#include<string.h> | |
int letter_to_i( char c ) | |
{ | |
if( isupper(c) ) | |
return c - 'A' + 27; | |
else if( islower(c) ) | |
return c - 'a' + 1; | |
else | |
return 0; | |
} | |
int main() | |
{ | |
int prime[10005] = { 1, 0, 0 }; | |
int i, j; | |
for( i = 2 ; i <= 10000 ; i++ ) | |
if( !prime[i] ) | |
for( j = i+i ; j <= 10000 ; j+=i ) | |
prime[j] = 1; | |
char word[25]; | |
while( gets(word) ) | |
{ | |
int L = strlen(word); | |
int sum = 0; | |
for( i = 0 ; i < L ; i++ ) | |
sum += letter_to_i( word[i] ); | |
if( prime[sum] ) | |
printf( "It is not a prime word.\n" ); | |
else | |
printf( "It is a prime word.\n" ); | |
} | |
return 0; | |
} |
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