10924-Prime Words

<br /> <br /> /* <br /> "Prime Words"<br /> Level:1.0(我自訂的) <br /> Date:2006/9/29<br /> */<br /> <br /> #include <stdio.h><br /> #include <ctype.h><br /> #define N 1041<br /> #define DATA 21<br /> <br /> main(){<br /> int i=0,j=0,sum=0; <br /> bool num[N]={true};<br /> char s[DATA]={};<br /> for(i=2;i*i<=N;i++) for(j=2*i;j<=N;j++) if(j%i == 0) num[j]= true; while(gets(s)){ i=sum=0; while(s[i]!= '\0'){ if(islower(s[i])) sum += (s[i]-96); else sum += (s[i]-38); i++; } if(!num[sum]) printf("It is a prime word.\n"); else printf("It is not a prime word.\n"); } }