import java.util.Scanner;public class Hello {
public static void main(String args[]){Scanner scan = new Scanner(System.in);
System.out.println("欢迎来到这里");
System.out.println("1:计算三角形面积");
System.out.println("2:计算四边形面积");
System.out.println("3:猜字游戏");
System.out.println("4:绘制菱形");
System.out.println("5:绘制倒三角形");
System.out.println("6:输入三个数,输出最大跟最小");
System.out.println("0:退出");
int choose = scan.nextInt();
while(choose != 0){
switch(choose){
case 1:{
Scanner scan1 = new Scanner(System.in);
System.out.println("请输入三角形的底");
int a = scan1.nextInt();
System.out.println("请输入三角形的高");
int b = scan1.nextInt();
int c = (a*b)/2;
System.out.println("三角形面积为"+c);
}break;
case 2:{
Scanner scan1 = new Scanner(System.in);
System.out.println("请输入四边形的长");
int a = scan1.nextInt();
System.out.println("请输入四边形的宽");
int b = scan1.nextInt();
int c = (a*b);
System.out.println("四边形面积为"+c);
}break;
case 3:{
System.out.println("请输入一个数猜它是什么");
int name = 20;
Scanner scan1 = new Scanner(System.in);
int pass = scan1.nextInt();
if(pass<name)
System.out.println("您输入的太小了");
else if(pass>name)
System.out.println("您输入的太大了");
else
System.out.println("恭喜您");}break;
case 4:{
int i;
int j;
int m;
for (m = 7; m > 0; m--) {
{
for (i = 0; i < m; i++) {
System.out.print(" ");
}
System.out.print("*");
for (j = 0; j <= 2 * (7 - m) - 2; j++) {
System.out.print(" ");
}
if (m == 7) {
System.out.println("");
} else
System.out.println("*"); }
}
for (m = 7; m >= 0; m--) {
{
for (i = 7; i > m; i--) {
System.out.print(" ");
}
System.out.print("*");
for (j = 12; j > 2 * (7 - m) - 1; j--) {
System.out.print(" ");
}
if (m == 0) {
System.out.println("");
} else
System.out.println("*");
}
}
}break;
case 5:{
for(int i=0;i<10;i++){
for(int j=0;j<10-i;j++){
if(j>i){
System.out.print("*");
}
else{
System.out.print(" ");
}
}
System.out.println();
}}break;
case 6:{
int []array=new int[10];
Scanner sc=new Scanner(System.in);
System.out.println("请输入3个数:");
for(int i=0;i<3;i++)
{
array[i]=sc.nextInt();
}
int maxIndex=0;
int max=array[0];
for(int i=0;i<3;i++)
{
if(array[i]>max)
{
max=array[i];
maxIndex=i;
}
}
int min=array[0];
int minIndex=0;
for(int i=0;i<3;i++)
{
if(array[i]<min)
{
min=array[i];
minIndex=i;
}
}
System.out.println("最小值为:array["+minIndex+"]="+array[minIndex]);
System.out.println("最大值为:array["+maxIndex+"]="+array[maxIndex]);}break;
}}}
}高手帮我这个新手修改些代码吧,或者提些建议;其中发生打印绘制图形出现死循环, 选择一个菜单进入后, 运行完成后,仍然在那执行那段语句,想要执行一条后返回到主菜单!
public static void main(String args[]){Scanner scan = new Scanner(System.in);
System.out.println("欢迎来到这里");
System.out.println("1:计算三角形面积");
System.out.println("2:计算四边形面积");
System.out.println("3:猜字游戏");
System.out.println("4:绘制菱形");
System.out.println("5:绘制倒三角形");
System.out.println("6:输入三个数,输出最大跟最小");
System.out.println("0:退出");
int choose = scan.nextInt();
while(choose != 0){
switch(choose){
case 1:{
Scanner scan1 = new Scanner(System.in);
System.out.println("请输入三角形的底");
int a = scan1.nextInt();
System.out.println("请输入三角形的高");
int b = scan1.nextInt();
int c = (a*b)/2;
System.out.println("三角形面积为"+c);
}break;
case 2:{
Scanner scan1 = new Scanner(System.in);
System.out.println("请输入四边形的长");
int a = scan1.nextInt();
System.out.println("请输入四边形的宽");
int b = scan1.nextInt();
int c = (a*b);
System.out.println("四边形面积为"+c);
}break;
case 3:{
System.out.println("请输入一个数猜它是什么");
int name = 20;
Scanner scan1 = new Scanner(System.in);
int pass = scan1.nextInt();
if(pass<name)
System.out.println("您输入的太小了");
else if(pass>name)
System.out.println("您输入的太大了");
else
System.out.println("恭喜您");}break;
case 4:{
int i;
int j;
int m;
for (m = 7; m > 0; m--) {
{
for (i = 0; i < m; i++) {
System.out.print(" ");
}
System.out.print("*");
for (j = 0; j <= 2 * (7 - m) - 2; j++) {
System.out.print(" ");
}
if (m == 7) {
System.out.println("");
} else
System.out.println("*"); }
}
for (m = 7; m >= 0; m--) {
{
for (i = 7; i > m; i--) {
System.out.print(" ");
}
System.out.print("*");
for (j = 12; j > 2 * (7 - m) - 1; j--) {
System.out.print(" ");
}
if (m == 0) {
System.out.println("");
} else
System.out.println("*");
}
}
}break;
case 5:{
for(int i=0;i<10;i++){
for(int j=0;j<10-i;j++){
if(j>i){
System.out.print("*");
}
else{
System.out.print(" ");
}
}
System.out.println();
}}break;
case 6:{
int []array=new int[10];
Scanner sc=new Scanner(System.in);
System.out.println("请输入3个数:");
for(int i=0;i<3;i++)
{
array[i]=sc.nextInt();
}
int maxIndex=0;
int max=array[0];
for(int i=0;i<3;i++)
{
if(array[i]>max)
{
max=array[i];
maxIndex=i;
}
}
int min=array[0];
int minIndex=0;
for(int i=0;i<3;i++)
{
if(array[i]<min)
{
min=array[i];
minIndex=i;
}
}
System.out.println("最小值为:array["+minIndex+"]="+array[minIndex]);
System.out.println("最大值为:array["+maxIndex+"]="+array[maxIndex]);}break;
}}}
}高手帮我这个新手修改些代码吧,或者提些建议;其中发生打印绘制图形出现死循环, 选择一个菜单进入后, 运行完成后,仍然在那执行那段语句,想要执行一条后返回到主菜单!
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输入非零数字后,循环一直执行下去,可以改为do while 循环
在后边加上一个判断条件!import java.util.Scanner; public class Hello {
public static void main(String args[]){
String answer;
Scanner scan = new Scanner(System.in);
do{
System.out.println("欢迎来到这里");
System.out.println("1:计算三角形面积");
System.out.println("2:计算四边形面积");
System.out.println("3:猜字游戏");
System.out.println("4:绘制菱形");
System.out.println("5:绘制倒三角形");
System.out.println("6:输入三个数,输出最大跟最小");
System.out.println("0:退出");
int choose = scan.nextInt();
switch(choose){
case 1:{
Scanner scan1 = new Scanner(System.in);
System.out.println("请输入三角形的底");
int a = scan1.nextInt();
System.out.println("请输入三角形的高");
int b = scan1.nextInt();
int c = (a*b)/2;
System.out.println("三角形面积为"+c);
}break;
case 2:{
Scanner scan1 = new Scanner(System.in);
System.out.println("请输入四边形的长");
int a = scan1.nextInt();
System.out.println("请输入四边形的宽");
int b = scan1.nextInt();
int c = (a*b);
System.out.println("四边形面积为"+c);
}break;
case 3:{
System.out.println("请输入一个数猜它是什么");
int name = 20;
Scanner scan1 = new Scanner(System.in);
int pass = scan1.nextInt();
if(pass <name)
System.out.println("您输入的太小了");
else if(pass>name)
System.out.println("您输入的太大了");
else
System.out.println("恭喜您"); }break;
case 4:{
int i;
int j;
int m;
for (m = 7; m > 0; m--) {
{
for (i = 0; i < m; i++) {
System.out.print(" ");
}
System.out.print("*");
for (j = 0; j <= 2 * (7 - m) - 2; j++) {
System.out.print(" ");
}
if (m == 7) {
System.out.println("");
} else
System.out.println("*"); }
}
for (m = 7; m >= 0; m--) {
{
for (i = 7; i > m; i--) {
System.out.print(" ");
}
System.out.print("*");
for (j = 12; j > 2 * (7 - m) - 1; j--) {
System.out.print(" ");
}
if (m == 0) {
System.out.println("");
} else
System.out.println("*");
}
}
}break;
case 5:{
for(int i=0;i <10;i++){
for(int j=0;j <10-i;j++){
if(j>i){
System.out.print("*");
}
else{
System.out.print(" ");
}
}
System.out.println();
} }break;
case 6:{
int []array=new int[10];
Scanner sc=new Scanner(System.in);
System.out.println("请输入3个数:");
for(int i=0;i <3;i++)
{
array[i]=sc.nextInt();
}
int maxIndex=0;
int max=array[0];
for(int i=0;i <3;i++)
{
if(array[i]>max)
{
max=array[i];
maxIndex=i;
}
}
int min=array[0];
int minIndex=0;
for(int i=0;i <3;i++)
{
if(array[i] <min)
{
min=array[i];
minIndex=i;
}
}
System.out.println("最小值为:array["+minIndex+"]="+array[minIndex]);
System.out.println("最大值为:array["+maxIndex+"]="+array[maxIndex]); }break;
}
System.out.println("是否退出?y/n");
answer=scan.next();
}while(!answer.equals("y"));}
}
package zgq;import java.util.Scanner;public class TT {
public static void main(String args[]){
boolean go=true;
while(go){
Scanner scan = new Scanner(System.in);
System.out.println("欢迎来到这里");
System.out.println("1:计算三角形面积");
System.out.println("2:计算四边形面积");
System.out.println("3:猜字游戏");
System.out.println("4:绘制菱形");
System.out.println("5:绘制倒三角形");
System.out.println("6:输入三个数,输出最大跟最小");
System.out.println("0:退出");
int choose = scan.nextInt();
//while(run){
switch(choose){
case 1:{
Scanner scan1 = new Scanner(System.in);
System.out.println("请输入三角形的底");
int a = scan1.nextInt();
System.out.println("请输入三角形的高");
int b = scan1.nextInt();
int c = (a*b)/2;
System.out.println("三角形面积为"+c);
} break;
case 2:{
Scanner scan1 = new Scanner(System.in);
System.out.println("请输入四边形的长");
int a = scan1.nextInt();
System.out.println("请输入四边形的宽");
int b = scan1.nextInt();
int c = (a*b);
System.out.println("四边形面积为"+c);
} break;
case 3:{
System.out.println("请输入一个数猜它是什么");
int name = 20;
Scanner scan1 = new Scanner(System.in);
int pass = scan1.nextInt();
if(pass <name)
System.out.println("您输入的太小了");
else if(pass>name)
System.out.println("您输入的太大了");
else
System.out.println("恭喜您");
} break;
case 4:{
int i;
int j;
int m;
for (m = 7; m > 0; m--) {
{
for (i = 0; i < m; i++) {
System.out.print(" ");
}
System.out.print("*");
for (j = 0; j <= 2 * (7 - m) - 2; j++) {
System.out.print(" ");
}
if (m == 7) {
System.out.println("");
} else
System.out.println("*");
}
}
for (m = 7; m >= 0; m--) {
{
for (i = 7; i > m; i--) {
System.out.print(" ");
}
System.out.print("*");
for (j = 12; j > 2 * (7 - m) - 1; j--) {
System.out.print(" ");
}
if (m == 0) {
System.out.println("");
} else
System.out.println("*");
}
}
}break;
case 5:{
for(int i=0;i <10;i++){
for(int j=0;j <10-i;j++){
if(j>i){
System.out.print("*");
}
else{
System.out.print(" ");
}
}
System.out.println();
}
}break;
case 6:{
int []array=new int[10];
Scanner sc=new Scanner(System.in);
System.out.println("请输入3个数:");
for(int i=0;i <3;i++)
{
array[i]=sc.nextInt();
}
int maxIndex=0;
int max=array[0];
for(int i=0;i <3;i++)
{
if(array[i]>max)
{
max=array[i];
maxIndex=i;
}
}
int min=array[0];
int minIndex=0;
for(int i=0;i <3;i++)
{
if(array[i] <min)
{
min=array[i];
minIndex=i;
}
}
System.out.println("最小值为:array["+minIndex+"]="+array[minIndex]);
System.out.println("最大值为:array["+maxIndex+"]="+array[maxIndex]);
}break;
}
//}
}
}
}这样可以满足你的需求了,但按0退出你要多写个case才行,我没写了。。
case: x
{
在这里面加上choose = 0;就退出了这个循环。
}
然后再用一个大的循环。把所有的都控制下。退出swith后。进行大的循环就可以了。大的循环用Boolean类型的变量控制就可以了!
public class TT {
public static void main(String args[]) { boolean go = true;
do {
Scanner scan = new Scanner(System.in);
System.out.println("欢迎来到这里");
System.out.println("1:计算三角形面积");
System.out.println("2:计算四边形面积");
System.out.println("3:猜字游戏");
System.out.println("4:绘制菱形");
System.out.println("5:绘制倒三角形");
System.out.println("6:输入三个数,输出最大跟最小");
System.out.println("0:退出");
int choose = scan.nextInt();
// while(run){
switch (choose) {
case 0:{
System.exit(0);
}
case 1: {
Scanner scan1 = new Scanner(System.in);
System.out.println("请输入三角形的底");
int a = scan1.nextInt();
System.out.println("请输入三角形的高");
int b = scan1.nextInt();
int c = (a * b) / 2;
System.out.println("三角形面积为" + c);
}
break;
case 2: {
Scanner scan1 = new Scanner(System.in);
System.out.println("请输入四边形的长");
int a = scan1.nextInt();
System.out.println("请输入四边形的宽");
int b = scan1.nextInt();
int c = (a * b);
System.out.println("四边形面积为" + c);
}
break;
case 3: {
System.out.println("请输入一个数猜它是什么");
int name = 20;
Scanner scan1 = new Scanner(System.in);
int pass = scan1.nextInt();
if (pass < name)
System.out.println("您输入的太小了");
else if (pass > name)
System.out.println("您输入的太大了");
else
System.out.println("恭喜您"); }
break;
case 4: {
int i;
int j;
int m;
for (m = 7; m > 0; m--) {
{
for (i = 0; i < m; i++) {
System.out.print(" ");
}
System.out.print("*");
for (j = 0; j <= 2 * (7 - m) - 2; j++) {
System.out.print(" ");
}
if (m == 7) {
System.out.println("");
} else
System.out.println("*"); }
}
for (m = 7; m >= 0; m--) {
{
for (i = 7; i > m; i--) {
System.out.print(" ");
}
System.out.print("*");
for (j = 12; j > 2 * (7 - m) - 1; j--) {
System.out.print(" ");
}
if (m == 0) {
System.out.println("");
} else
System.out.println("*");
}
} }
break;
case 5: {
for (int i = 0; i < 10; i++) {
for (int j = 0; j < 10 - i; j++) {
if (j > i) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();
} }
break;
case 6: {
int[] array = new int[10];
Scanner sc = new Scanner(System.in);
System.out.println("请输入3个数:");
for (int i = 0; i < 3; i++) {
array[i] = sc.nextInt();
}
int maxIndex = 0;
int max = array[0];
for (int i = 0; i < 3; i++) {
if (array[i] > max) {
max = array[i];
maxIndex = i;
}
}
int min = array[0];
int minIndex = 0;
for (int i = 0; i < 3; i++) {
if (array[i] < min) {
min = array[i];
minIndex = i;
}
}
System.out.println("最小值为:array[" + minIndex + "]="
+ array[minIndex]);
System.out.println("最大值为:array[" + maxIndex + "]="
+ array[maxIndex]); }
break;
}
}while(go);
}
}