发布时间 : 星期三 文章黑马基础班入学考试更新完毕开始阅读0272c3be0b1c59eef9c7b439
C.1
D.编译报错
28.下面程序运行的结果是()
public static void main(String [] args) {
int x = 19; switch(x) {
case 19;
System.out.println(“A”); break; case 17;
System.out.println(“B”); break; default;
System.out.println(“C”); break;
} } A.A B.B C.C
D.程序报错
29.下列循环语句, 哪些是输出1--10这10个数字?() A. for(int x = 0; x < 10; x++) {
System.out.println(x); }
B.for(int x = 0; x <= 10; x++) {
System.out.println(x); }
C.for(int x = 1; x < 10; x++) {
System.out.println(x); }
D.for(int x = 1; x < = 10; x++) {
System.out.println(x); }
30.哪些代码能实现从1到10的和? () A.
int sum = 0;
for(int a = 1; a <= 11; a++) {
sum += a ; }
B.
int sum = 0; int a = 1;
while(a <= 10) {
sum += a; a = a+ 1; } C.
int sum = 0; int a = 0; do{
a = a + 1; sum += a; }while(a != 10); D.
int sum = 0;
for(int x = 0; x <= 10; x++) {
sum = 1 +２+ 3 + ... + 9 + 10; }
31.查看代码, 想要输出A, 那个选项可以实现() public static void main(String [] args) {
int x = 80; ? if( x > 100) {
System.out.println(“A”); }else{
System.out.print;n(“B”); } }
A. x + 20; B. x + 21; C. x += 21; D. x = 101;
32.查看下面的程序代码, 输出的结果是() public static void main(String [] args) {
int x = 80; int x = x - 1; x *= 10; if(x != 790)
Sytem.out.println(x);
else
System.out.println(x / 10);
} A .80 B. 79 C. 790
D.编译错误
33.下面代码运行结果是()
public staic void main(String [] args) {
int x = 80; x ++;
switch(x) {
case 80;
System.out.println(80); case 81;
System.out.println(81); default;
System.out.println(82);
} } A. 80 B. 80 81 C. 81 D. 81 82
34.下面程序代码的运行结果是() public static void main(String [] args) {
for(int x = 80; x < 90; x++) {
System.out.println(x); } } A.80 B.90
C.输出80, 81,...,89, 90 D.输出80, 81,...,88, 89
35.下面代码的运行结果是()
public static void main(String [] args) {
boolean flag; int x = 8; int y = 9; flag = (x < y);
while(flag && x > 0) {
System.out.println(x); x = x - 1; } }
A.什么也没有输出 B.程序报错
C.输出 8 7 6 5 4 3 2 D.输出 8 7 6 5 4 3 2 1
36.下面代码的运行结果是()
public static void main(String [] args) {
int x = 80; do{
System.out.println(80); x = x - 20; }while( x >= 0); }
A.80 60 40 20 0 B.60 40 20 0 C.80 60 40 20 D.80 80 80 80 80
37.下面代码的运行结果是()
public static void main(String [] args) {
for(int x = 0; x < 5; x++) {
if(x % 3 == 0) {
continue; }
System.out.println(x); } }
A. 0 1 2 B. 1 3 5 C. 1 2 4 D. 0 3 5
38.下面程序运行的结果是()
public static void main(String [] args) {
int a = 1; if (a++ > 1) {
System.out.println(a); }else{
System.out.println(a) }