Java Programming Job c.njupt.edu.cn Java implementation Third job

Wang Li "Java language programming 3rd time Job (2018)" Detailed

Job Result Details

Score: 100 Selection score: 601. The following definition statement is provided: String s1= "My cat"; int M=s1.compareto ("My A Cat"); the value of M after the statement is executed ()A.2b.1c.0d.-2 the correct answer is: A2. Statement string S1=new string ("Hello"); String S2=new string ("Hello"); System.out.println (S1==S2); SYSTEM.OUT.PRINTLV (s1.equals (S2)); The output after execution is ()A.hello Falseb.hello Truec.hello hellod.false True The correct answer is: D3. Execute the following statement int[] lx={2,3,4,5}; lx[3]=lx[3]==--lx[0]?++lx[1]:lx[2]--; After the element values for the array lx are ()a.1,2,3,4b.1,3,3,3c.1,2,3,3d.1,3,3,4 the correct answer is: D4. In an application defined array a:int[] a={1,2,3,4,5,6,7,8,9,10}, in order to print the last array element of the output array A, the following correct code is ()A.system.out.println (a[10]); B.system.out.println (a[9]); C.system.out.println (A[8]);D. System.out.println (A[a.length]); the correct answer is: B5. There is a definition statement int a[]={36,72,99}; The following describes the error for this statement ()A. The statement defines a one-dimensional array named A; the B.A array has 3 elements; C. Each element in the array is an integer, and the subscript of the elements of the D.A array is; the correct answer is: D6. The following about the array definition statement is incorrect ()A.float f[]=new{2.4f,3.5f,5.7f,7.9f}; B.int a[]={1,2,3,4,5}c.double[]d=new double[10];D. int[]a2; The correct answer is: a7. After the following statement sequence is executed, the value of C is () int a=3,b=4,c=0; while (a++ < (--b)) ++c;A.0b.1c.2d.3 the correct answer is: A8. After the following statement sequence is executed, the value of A is () int a=1; for (int i=5;i>0;i-=2) a*=i;a.0b.1c.15d.60 the correct answer is: C9. After the following statement sequence is executed, the value of C is () int a=10,b=18,c=30; switch (b-a) {case 8:c++; case 9:c+=2; case 10:c+=3; default:c/=b;} a.31b.32c.2d.33 the correct answer is: C10. Set A, b is an int variable, C, D is a fload type variable, ch is a char type variable, and all variables are assigned values, the following correct switch statement is ()A.switch (A+B); {...} B.switch (ch+1) {...} C.switch ch {...} D.switch (c+d) {...} The correct answer is: B11. After the following statement sequence is executed, the value of C is () int a=4,b=5,c=9,d=6; if (a>b| | C<D) c--; else C + +;A.6b.10c.8d.9 the correct answer is: B12. After the following statement sequence is executed, the value of C is () int a=6,b=3,c=5; if (a==b) C+=a;else c=++a*c;a.15b.25c.35d.45 the correct answer is: C13. After the following statement sequence is executed, the value of the C variable is () int a=2,b=4,c=5; if (a<--b) c*=a;a.5b.20c.15d.10 the correct answer is: D14. After the following sequence of statements is executed, the value in the CH1 variable is () Char ch1= ' A ', ch2= ' B '; if (CH1+2<CH2) ++ch1;A. ' A ' B. ' B ' c.ad. b The correct answer is: A15. In the following options, the valid assignment statement is ()a.++m!=n--; B.++m; c.m=m+1=5;d.m==1; The correct answer is: B16. There is a definition of "int a=22;long b=56;", the following assignment is incorrect statement is ()A.a=b; b.b= (long) A; c.a= (int) b;d.b=a; the correct answer is: a17. The following option, () is the correct output result int m=2,n=1; m+=m-=n; System.out.println ("m=" +m);A.m=1b.m=2c.m=3d.m=4 the correct answer is: C18. The following statement sequence executes after the result is () int a=10,b=4,c=20,d=6; System.out.println (a++*b+c*--d);a.144b.140c.28d. Unable to execute the correct answer is: B19. If the variables in the following options are defined correctly, the illegal expression is ()a.a>4==6<1; B. ' N '-3; C. ' A ' =8;d. ' A '%6 correct answer is: C20. Suppose a is a variable of type int that has been declared and assigned an initial value, then the assignment statement for A is correct ()A.int a=6; b.a==3; c.a=3.2f;d.a+=a*3; The correct answer is: D programming question score: 40print a few days a month score: 10/10

Import Java.util.Scanner;/*** @Author liguo* @Description * @Data 2018-04-03*/PublicClassMain {PublicStaticvoidMainString[] (args) {int year;int month;Int[] A = {1,3,5,7,8,10,12};Int[] B = {4,6,9,11}; Scannerin =New Scanner (System.in); Year =In.nextint (); month =In.nextint ();Judging February, consider leap year conditionsif (month = =2) {if (year%100! =0 && Year%4 = =0 | | Year%400 = =0) System.OUT.PRINTLN (Year + "-29"); else System. out.println (year +  "-" + month +  "-28 " ); } //Judge 31-day situation for (int element:a) { if (month = = Element) {System. "-" + month +  " -31");} //Judge 30-day situation for (int element:b) { if (month = = Element) {System. "-" + month +  " -30");}}}    

4-3-200 sub-system score conversion grade Score: 10/10

Import Java.util.Scanner;/*** @Author liguo* @Description read a percentile score x (0 < = x < = 100) from the keyboard and convert it to a grade score output. The subject is required to be implemented in the C and Java languages using the switch branch. * Grades (Percentile results) * A (90<=x<=100) * B (80<=x<90) * C (70<=x<80) * D (60<=x<70) * E (0<=x<60) * @Data 2018-04-03*/PublicClassMain {StaticvoidJudgeint mark) {Char degree =' A ';int temp = MARK/10;if (temp >=0 && Temp <6) degree =' E ';if (temp = =6) degree =' D ';if (temp = =7) degree =' C ';if (temp = =8) degree =' B ';if (temp = =9 | | temp = =) degree =' A '; System.Out.println (Mark +"--" + degree); }PublicStaticvoidMainString[] (args) {int temp; Scannerin =New Scanner (System.in);int x =in.nextint (); temp = x/10; if (temp >= 0 && temp <  6) temp = 5; switch (temp) {case 5:judge (x); Span class= "Hljs-keyword" >break; case 6:judge (x); break; case 7:judge (x); break; case 9:judge (x); break; case 10:judge (x); break;} }} 

solving piecewise function scores with an IF statement: 10/10

Import Java.util.Scanner;/*** @Author liguo* @Description piecewise Function Solution: Enter x to calculate and output y values: * y=x+100 (when x) * y= x (when 2 0≤x≤100) * Y=X-100 (when X is 10 0) * @Data 2018-04-03*/PublicClassMain {Publicstatic void main (string[" args) {double x, y; Scanner in = new Scanner (System. in); x = in.nextdouble (); if (x < 20) y = x + 100; else if (x >= Span class= "Hljs-number" >20 && x <= 100) y = x; else y = x-100; System. out.printf ( "x=%.2f,y=%.2f", X, y);}}      

2-2 Mixed-type data format input score: 10/10

Import Java.util.Scanner;/*** @Author liguo* @Description Enter the floating-point number 1, Integer, character, and floating-point number 2 in a row, separated by 1 spaces. * Input Description * Enter the floating-point number 1, Integer, character, floating-point number 2 in the order given in a row, separated by 1 spaces. * Output Description * Output in a row in the order of characters, integers, floating point number 1, floating point number 2, where the floating-point number retains 2 digits after the decimal point. * @Data 2018-04-03*/PublicClassmain {public static void main (string[] args) {Scanner in = new Scanner (system.< Span class= "Hljs-keyword" >in); double d1 = in.nextdouble (); in.nextint (); String s = in.next ();  char C = s.charat (0); in.nextdouble (); System. out.printf ( "%c%d%.2f%.2f", C, I, D1, D2);}}    

3-4-1A calculates the number of digits and scores of three digits: 10/10

Import Java.util.Scanner;/*** @Author liguo* @Description Enter any three-digit integer from the keyboard, write the program to calculate the digits and the number of the integer. Input description Enter a three-digit integer output description * @Data 2018-04-03*/Publicclass main {public static void  Main (string[] args) {Scanner in =  New Scanner (System. in); int temp = in.nextint (); temp = Math.Abs (temp); int a = Temp/100; int B = temp/10%10; int C = temp%10; int sum = a+b+c; System. out.println (sum);}}           

Java Programming Job c.njupt.edu.cn Java implementation Third job