UVa 537

UVa 537

没什么好说的，锻炼编程能力，注意善用scanf :)

1 #include < cstdio > 2 using namespace std; 3 4 int N; 5 double a[ 260 ]; 6 7 int main() 8 { 9 #ifndef ONLINE_JUDGE 10 freopen( " 537.in " , " r " ,stdin); 11 freopen( " 537.out " , " w " ,stdout); 12 #endif 13 14 scanf( " %d " , & N); 15 getchar(); 16 17 for ( int i = 1 ;i <= N;i ++ ){ 18 a[ ' U ' ] = a[ ' I ' ] = a[ ' P ' ] = 0.0 ; 19 for ( int j = 0 ;j <= 1 ;j ++ ){ 20 char last = getchar(),now; 21 while ((now = getchar()) != ' = ' )last = now; 22 scanf( " %lf%c " , & a[last], & now); 23 switch (now){ 24 case ' m ' : 25 a[last] /= 1000.0 ; 26 break ; 27 case ' k ' : 28 a[last] *= 1000.0 ; 29 break ; 30 case ' M ' : 31 a[last] *= 1000000.0 ; 32 break ; 33 } 34 } 35 36 printf( " Problem #%d\\n " ,i); 37 38 if (a[ ' U ' ] && a[ ' I ' ]) 39 printf( " P=%.2lfW " ,a[ ' U ' ] * a[ ' I ' ]); 40 else if (a[ ' U ' ] && a[ ' P ' ]) 41 printf( " I=%.2lfA " ,a[ ' P ' ] / a[ ' U ' ]); 42 else if (a[ ' I ' ] && a[ ' P ' ]) 43 printf( " U=%.2lfV " ,a[ ' P ' ] / a[ ' I ' ]); 44 printf( " \\n\\n " ); 45 } 46 47 fclose(stdin); 48 fclose(stdout); 49 return 0 ; 50 } 51