알고리즘 문제 - 알고스팟 Conversions 문제

본문제는 알고스팟(http://algospot.com/judge/problem/read/CONVERT)에서 참조했습니다.

 

문제

Conversion between the metric and English measurement systems is relatively simple. Often, it
involves either multiplying or dividing by a constant. You must write a program that converts between the following units:

Type	Metric	English equivalent
Weight	1.000 kilogram	2.2046 pounds
	0.4536 kilograms	1.0000 pound
Volume	1.000 liter	0.2642 gallons
	3.7854 liters	1.000 gallon

입력

The first line of input contains a single integer N, (1 ≤ N ≤ 1000) which is the number of datasets that follow.
Each dataset consists of a single line of input containing a floating point (double precision) number, a space and the unit specification for the measurement to be converted. The unit specification is one of kg, lb, l, or g referring to kilograms, pounds, liters and gallons respectively.

출력

For each dataset, you should generate one line of output with the following values: The dataset
number as a decimal integer (start counting at one), a space, and the appropriately converted value rounded to 4 decimal places, a space and the unit specification for the converted value.

예제 입력

5
1 kg
2 l
7 lb
3.5 g
0 l

예제 출력

1 2.2046 lb
2 0.5284 g
3 3.1752 kg
4 13.2489 l
5 0.0000 g

이번문제는 너무나도 쉬워서 그냥 한번에 맞췄네요. 그냥 간단한 컨버트 함수 만들고 if-else if 문을 이용해서 어떤 변환인지 확인한후 변환해주면 끝나네요..

#include <stdio.h>
#include <string.h>
#include <iostream>
 
using namespace std;
 
char resultunit[10];
 
double kgtolb(double input){
 
        return input*2.2046;
}
 
double lbtokg(double input){
 
 
        return input*0.4536;
}
 
double ltog(double input){
 
        return input*0.2642;
}
 
double gtol(double input){
 
        return input*3.7854;
}
 
int unitchk(char* unit){
 
        int output=0;
 
        if(!strcmp(unit, "kg")){
               
               output = 1;
 
        }else if(!strcmp(unit, "lb")){
 
               output = 2;
 
        }else if(!strcmp(unit, "l")){
 
               output = 3;
 
        }else if(!strcmp(unit, "g")){
        
               output = 4;
 
        }else{
        
               output =  -9999;
 
        }       
 
        return output;
}
 
double calculate(int unit,double input){
 
        double output=0;
 
        if(unit==1){
               
               output = kgtolb(input);
 
        }else if(unit==2){
 
               output = lbtokg(input);
 
        }else if(unit==3){
 
               output = ltog(input);
 
        }else if(unit==4){
        
               output = gtol(input);
 
        }else{
        
               output =  -9999;
 
        }       
 
        return output;
 
 
}
 
void unitoutput(int unit){
 
        if(unit==1){
                       
               strcpy(resultunit, "lb");
 
        }else if(unit==2){
 
               strcpy(resultunit, "kg");
 
 
        }else if(unit==3){
 
               strcpy(resultunit, "g");
 
        }else if(unit==4){
        
               strcpy(resultunit, "l");
 
        }else{
        
               strcpy(resultunit, " ");
 
        }       
 
        //return resultunit;
}
 
 
 
int main(){
 
        int i=0;
        int N;
        int chkunit;
        double value=0;
        char in_unit[10];
        //string in_unit;
        //string unit[4] = {"kg", "lb", "l", "g"};
 
        double result=0;
        //char *resultunit;
 
        scanf("%d", &N);
 
        for(i=0; i < N; i++){
 
               scanf("%lf", &value);//double은lf임
               scanf("%s", in_unit);
 
               chkunit = unitchk(in_unit);
               result = calculate(chkunit, value);
               unitoutput(chkunit);
 
               printf("%d %.4f %s\n", i+1 ,result, resultunit);
 
 
        }
 
 
        return 0;
}