USACO 1.1.1 Your Ride Is Here (ride)

**USACO地址：http://ace.delos.com/usacogate

 

輸入兩個大寫(upper case)字串計算它們的相似性。

主要在於將每個字元轉換成相應的數字("A" is 1 and "Z" is 26)。根據ASCII字元表，字元‘@’在'A'之前，故將任一大寫字母減去‘@’可得對應的數字。

注意：容易出錯的是sa和sb的類型，int很可能會溢出。

 

/*<br />ID: gengjia1<br />LANG: C<br />TASK: ride<br />*/<br />#include <stdio.h><br />#include <stdlib.h><br />int main(void) {<br />FILE *fin = fopen ("ride.in", "r");<br />FILE *fout = fopen ("ride.out", "w");<br />char a[7],b[7];<br />long sa = 1, sb = 1;<br />int i = 0;<br />fscanf (fin, "%s/n%s", a, b);<br />while (a[i] != '/0') {<br />sa *= a[i] - '@';<br />i += 1;<br />}<br />i = 0;<br />while (b[i] != '/0') {<br />sb *= b[i] - '@';<br />i += 1;<br />}<br />if ((sa % 47) == (sb % 47))<br />fprintf (fout, "GO/n");<br />else<br />fprintf (fout, "STAY/n");<br />exit(0);<br />}