用于计算分数的Java程序 [英] Java program for calculating fractions
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问题描述
我现在面临的唯一问题是没有我的变量正在初始化，我不知道如何使输出如下所示：
1 1 3
--- + --- = ---
4 8 8
这里是我到目前为止的代码，任何帮助将不胜感激，因为我对使用java的知识是最小的：
import java。 util.Scanner;
public class FractionCalculator {
public static void main（String [] args）{
Scanner in = new Scanner（System.in）;
int n1;
int n2;
int d1;
int d2;
int n;
int d;
char o;
int m1，m2;
int tempN1，tempN2;
int lcm，x;
System.out.println（输入分子1的分子：）;
n1 = in.nextInt（）;
System.out.println（输入分数1的分母：）;
d1 = in.nextInt（）;
if（d1> 0）{
System.out.println（）;
} else {
System.out.println（Invalid denominator）;
System.exit（0）;
}
System.out.println（Enter an operator：）;
o = in.next（）。toCharArray（）[0];
System.out.println（输入分数2的分子：）;
n2 = in.nextInt（）;
System.out.println（输入分数2的分母：）;
d2 = in.nextInt（）;
if（d2> 0）{
System.out.println（）;
} else {
System.out.println（Invalid denominator）;
System.exit（0）;
$ b switch（o）{
case'*'：
n = n1 * n2;
d = d1 * d2;
休息;
案例'/'：
n = n1 * d2;
d = n2 * d1;
休息;
case'+'：
int max = n1> d1？n1：d1;
int min = n1
x = max * i;
if（x％min == 0）
lcm = x;
tempN1 = n1 * m1;
tempN2 = n2 * m2;
m1 = lcm / d1;
m2 = 1cm / d2;
n = tempN1 + tempN2;
d = lcm;
休息;
案例' - '：
n = tempN1 - tempN2;
d = lcm;
休息;
默认值：
System.out.println（非法操作符：+ o）;
休息; }
}
}
解决方案
更新：
请注意，这是我的不完整和/或最佳解决方案，但至少它应该带您进入正确的方向。你仍然必须减少分数并做一些其他的调整。
import java.math.BigInteger;
import java.util.Scanner;
public class FractionCalculator {
public static void main（String [] args）{
Scanner in = new Scanner（System.in）;
int n1;
int n2;
int d1;
int d2;
int n = 0;
int d;
char o;
System.out.println（输入分子1的分子：）;
n1 = in.nextInt（）;
System.out.println（输入分数1的分母：）;
d1 = in.nextInt（）;
if（d1> 0）{
System.out.println（）;
} else {
System.out.println（Invalid denominator）;
System.exit（0）;
}
System.out.println（Enter an operator：）;
o = in.next（）。toCharArray（）[0];
System.out.println（输入分数2的分子：）;
n2 = in.nextInt（）;
System.out.println（输入分数2的分母：）;
d2 = in.nextInt（）;
if（d2> 0）{
System.out.println（）;
} else {
System.out.println（Invalid denominator）;
System.exit（0）;
switch（o）{
case'*'：
n = n1 * n2;
d = d1 * d2;
break;
案例'/'：
n = n1 * d2;
d = n2 * d1;
break;
case'+'：
case' - '：
d = gcd（d1，d2）;
n1 * = d / d1;
n2 * = d / d2;
if（o =='+'）{
n = n1 + n2;
}
else if（o ==' - '）{
n = n1 - n2;
}
break;
默认值：
System.out.println（非法操作符：+ o）;
return;
}
System.out.printf（％d％d％d \ n，n1，n2，n）;
System.out.printf（---％c --- = --- \\\
，o）;
System.out.printf（％d％d％d \ n，d1，d2，d）;
$ b $ private static int gcd（int d1，int d2）{
BigInteger gcd = new BigInteger（String.valueOf（d1））。gcd（new BigInteger（String。的valueOf（D2）））;
return gcd.intValue（）;
}
}
The purpose of the program is to get two user inputs for a fraction, receive a operator from the user, and then to get two more user inputs for a second fraction. The program must check that the numbers used in both fractions range between 0-99 and have a non-zero denominator. The program also has to make sure that the user inputs a valid operator (-,+,*,/).
The only problem I am facing now is that none of my variables are being initialized and that I don't know how to make the output look like so:
1 1 3
--- + --- = ---
4 8 8
Here is the code I have so far, any help would be much appreciated because my knowledge for using java is minimal:
import java.util.Scanner;
public class FractionCalculator {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int n1;
int n2;
int d1;
int d2;
int n;
int d;
char o;
int m1,m2;
int tempN1, tempN2;
int lcm, x;
System.out.println("Enter a numerator for fraction 1: ");
n1 = in.nextInt();
System.out.println("Enter a denominator for fraction 1: ");
d1 = in.nextInt();
if (d1 > 0) {
System.out.println();
} else {
System.out.println("Invalid denominator");
System.exit(0);
}
System.out.println("Enter an operator: ");
o = in.next().toCharArray()[0];
System.out.println("Enter a numerator for fraction 2: ");
n2 = in.nextInt();
System.out.println("Enter a denominator for fraction 2: ");
d2 = in.nextInt();
if (d2 > 0) {
System.out.println();
} else {
System.out.println("Invalid denominator");
System.exit(0);
}
switch(o){
case '*':
n = n1 * n2;
d = d1 * d2;
break;
case '/':
n = n1 * d2;
d = n2 * d1;
break;
case '+':
int max=n1>d1?n1:d1;
int min=n1<d1?n1:d1;
for(int i=1;i<=min;i++)
x=max*i;
if (x%min==0)
lcm=x;
tempN1=n1*m1;
tempN2=n2*m2;
m1=lcm/d1;
m2=lcm/d2;
n = tempN1 + tempN2;
d = lcm;
break;
case '-':
n = tempN1 - tempN2;
d = lcm;
break;
default:
System.out.println("Illegal Operator: "+ o);
break; }
}
}
解决方案
UPDATE:
Be aware that this is my no means complete and/or the best solution, but at least it should take you in the right direction. You will still have to reduce fractions and do some other tweaks.
import java.math.BigInteger;
import java.util.Scanner;
public class FractionCalculator {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int n1;
int n2;
int d1;
int d2;
int n = 0;
int d;
char o;
System.out.println("Enter a numerator for fraction 1: ");
n1 = in.nextInt();
System.out.println("Enter a denominator for fraction 1: ");
d1 = in.nextInt();
if (d1 > 0) {
System.out.println();
} else {
System.out.println("Invalid denominator");
System.exit(0);
}
System.out.println("Enter an operator: ");
o = in.next().toCharArray()[0];
System.out.println("Enter a numerator for fraction 2: ");
n2 = in.nextInt();
System.out.println("Enter a denominator for fraction 2: ");
d2 = in.nextInt();
if (d2 > 0) {
System.out.println();
} else {
System.out.println("Invalid denominator");
System.exit(0);
}
switch (o) {
case '*':
n = n1 * n2;
d = d1 * d2;
break;
case '/':
n = n1 * d2;
d = n2 * d1;
break;
case '+':
case '-':
d = gcd(d1, d2);
n1 *= d / d1;
n2 *= d / d2;
if(o == '+') {
n = n1 + n2;
}
else if(o == '-') {
n = n1 - n2;
}
break;
default:
System.out.println("Illegal Operator: " + o);
return;
}
System.out.printf(" %d %d %d\n", n1, n2, n);
System.out.printf("--- %c --- = ---\n", o);
System.out.printf(" %d %d %d\n", d1, d2, d);
}
private static int gcd(int d1, int d2) {
BigInteger gcd = new BigInteger(String.valueOf(d1)).gcd(new BigInteger(String.valueOf(d2)));
return gcd.intValue();
}
}
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