Java_ Basic Grammar programming exercises

One: Let the computer randomly produce 100 integers between 0 and 100, each representing a student's score, and calculating the average of those scores.

 Public Static void Main (string[] args) {        int sum = 0;          for (int i = 0; i < i++) {            int n = (int) (Math.random () *101) 
    + = n;        }        System.out.println ("average value:" + (sum/100.0));    }

Two: Enter a number of 100-999 to determine if it is a narcissus number

 Public Static voidMain (string[] args)throwsmyexception {System.out.println ("Please enter a three-bit integer greater than 100 less than 1000:"); Scanner SC=NewScanner (system.in); intinput =Sc.nextint (); if(Input < | | input > 1000) {            Throw NewMyException ();//Customize the Exception class to determine whether the input data meets the criteria        }        intA = input/100; intb = INPUT/10% 10; intc = input% 10; if(Input = = A * A * a + b * b * b + c * c *c) {System.out.print (input+ "is narcissus number" + "\ n" + input + "=" + (A + "*" + A + "*" + a) + "+" + (b + "*" + B + "*" +b) + "+" + (c + "*" + C + "*" +c)); } ElseSystem.out.print (Input+ "Not narcissus number"); }

Three: Judging whether a number is odd or even

 Public Static voidMain (string[] args) {//receiving data from the keyboardSystem.out.println ("Please enter an integer:"); Scanner s=NewScanner (system.in); intx =S.nextint (); intA = x% 2; if(A! = 0) {System.out.println (x+ "is odd"); }        Else{System.out.println (x+ "is even"); }    }

Four: The entrance Examination question: English, mathematics C language triple total score is equal to 230, and the English result is greater than equal to 60 to study

 Public Static voidMain (string[] args) {//Entrance Examination Questions: English, Mathematics C language, the total score is greater than or equal to 230, and the English result is more than//to study.System.out.print ("Please input your English score:"); Scanner 中文版=NewScanner (system.in); Doublex =english.nextdouble (); System.out.print ("Please enter your math score:"); Scanner Math=NewScanner (system.in); Doubley =english.nextdouble (); System.out.print ("Please enter your C-language score:"); Scanner Cenglish=NewScanner (system.in); Doublez =cenglish.nextdouble (); //Total of all courses        Doublesum = x + y +Z; System.out.println ("English score is" +x); System.out.println ("Total of all courses" +sum); if(x >= && sum >= 230) {System.out.println ("Congratulations on your success!"); }Else{System.out.println ("I'm sorry, but you need to refuel!!!"); }    }

Five: Enter a number, determine whether it can be 3 full out, and output the corresponding prompt information

 Public Static void Main (string[] args) {        // Enter a number to determine if it can be 3 full, and output the corresponding hint message        System.out.print ("Please enter a number:") ;         New Scanner (system.in);         double x = a.nextdouble ();                 if ((x% 3) = = 0)            {+ "can be divisible by 3");        } Else {            + "cannot be divisible by 3");}    }

Six: Determine the maximum value of two numbers and output

 Public Static voidMain (string[] args) {//determine the maximum value of two numbers and outputSystem.out.print ("Please enter the first number:"); Scanner a=NewScanner (system.in); Doublex =a.nextdouble (); System.out.print ("Please enter a second number:"); Scanner b=NewScanner (system.in); Doubley =b.nextdouble (); //Three mesh operator        Doublez = (x > Y)?x:y; System.out.println ("Maximum of two numbers is:" +z); }

Seven: Use the If-else statement to determine whether the year entered is leap years
Year that can be divisible by 4 but not divisible by 100, or a year that can be divisible by 400

 Public Static voidMain (string[] args) {//use the If-else statement to determine whether the year entered is a leap years//year that can be divisible by 4 but not divisible by 100, or a year that can be divisible by 400System.out.print ("Please enter a year:"); Scanner SC=NewScanner (system.in); intYear =Sc.nextint (); if(((Year percent 4 ==0) && ((year & 100) = 0)) | | (Year% 400 = = 0) {System.out.println ( year+ "is a leap year"); }Else{System.out.println ( year+ "Not leap year"); }    }

Eight: the keyboard input 1-7 of any number, respectively, output the corresponding information

 Public Static voidMain (string[] args) {//Keyboard input 1-7 of any number, respectively output the corresponding informationSystem.out.print ("Please enter any number of 1-7:"); Scanner SC=NewScanner (system.in); intWeek =Sc.nextint (); Switch(week) { Case1: System.out.println ("Today is Monday");  Break;  Case2: System.out.println ("Today is Tuesday");  Break;  Case3: System.out.println ("Today is Wednesday");  Break;  Case4: System.out.println ("Today is Thursday");  Break;  Case5: System.out.println ("Today is Friday");  Break;  Case6: System.out.println ("Today is Saturday");  Break;  Case7: System.out.println ("Today is Sunday");  Break; default: System.out.println ("The number you entered is not valid");    } sc.close (); }

Java_ Basic grammar programming exercises