立志用更少的代碼做更高效的表達

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　Yesterday your dear cousin Coach Pang gave you a new 100MB hard disk drive (HDD) as a gift because you will get married next year.
　　But you turned on your computer and the operating system (OS) told you the HDD is about 95MB. The 5MB of space is missing. It is known that the HDD manufacturers have a different capacity measurement. The manufacturers think 1 “kilo” is 1000 but the OS thinks that is 1024. There are several descriptions of the size of an HDD. They are byte, kilobyte, megabyte, gigabyte, terabyte, petabyte, exabyte, zetabyte and yottabyte. Each one equals a “kilo” of the previous one. For example 1 gigabyte is 1 “kilo” megabytes.
　　Now you know the size of a hard disk represented by manufacturers and you want to calculate the percentage of the “missing part”.

Input
　　The first line contains an integer T, which indicates the number of test cases.
　　For each test case, there is one line contains a string in format “number[unit]” where number is a positive integer within [1, 1000] and unit is the description of size which could be “B”, “KB”, “MB”, “GB”, “TB”, “PB”, “EB”, “ZB”, “YB” in short respectively.

Output
　　For each test case, output one line “Case #x: y”, where x is the case number (starting from 1) and y is the percentage of the “missing part”. The answer should be rounded to two digits after the decimal point.

Sample Input
2
100[MB]
1[B]
Sample Output
Case #1: 4.63%
Case #2: 0.00%

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1、在printf中， %的輸出格式是：%%

2、比例是固定的，與數(shù)字沒關(guān)系，因此采用映射或打表。

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代碼展示

#include<iostream> #include<map> #include<string> using namespace std; int main() {map<string, int>m; m["[B]"]=0; m["[KB]"]=1; m["[MB]"]=2; m["[GB]"]=3;m["[TB]"]=4; m["[PB]"]=5; m["[EB]"]=6; m["[ZB]"]=7; m["[YB]"]=8; int T = 0;int n; cin >> n; while(n--) { int d; string s; cin >> d >> s;printf("Case #%d: ", ++T);if(s == "[B]") cout << "0.00%" << '\n';else {double d = 1;for(int i = 0; i < m[s]; i++) {d *= 1000.0;d /= 1024;}printf("%.2lf%%\n", (1-d)*100);} } return 0; }

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每日一句

忍耐不是美德，把忍耐當(dāng)成美德是這個偽善的世界維持它扭曲的秩序的方式。 生氣才是美德。

?????????????????????????????——《房思琪的初戀樂園》

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