Question 1

Question 1A Prime-Adam integer is a positive integer (without leading zeros) which is a prime as well as an Adam number.Prime number: A number which has only two factors, i.e. 1 and the number itself.Example: 2, 3, 5, 7 ... etc.Adam number: The square of a number and the square of its reverse are reverse to each other.Example: If n = 13 and reverse of 'n' = 31, then,(13)2 = 169(31)2 = 961 which is reverse of 169thus 13, is an Adam number.Accept two positive integers m and n, where m is less than n as user input. Display all Prime-Adam integers that are in the range between m and n (both inclusive) and output them along with the frequency, in the format given below:Test your program with the following data and some random data:Example 1INPUT:m = 5n = 100OUTPUT:THE PRIME-ADAM INTEGERS ARE:11 13 31FREQUENCY OF PRIME-ADAM INTEGERS IS: 3Example 2INPUT:m = 100n = 200OUTPUT:THE PRIME-ADAM INTEGERS ARE:101 103 113FREQUENCY OF PRIME-ADAM INTEGERS IS: 3Example 3INPUT:m = 50n = 70OUTPUT:THE PRIME-ADAM INTEGERS ARE:NILFREQUENCY OF PRIME-ADAM INTEGERS IS: 0Example 4INPUT:m = 700n = 450OUTPUT:INVALID INPUTSolutionimport java.util.Scanner;

public class PrimeAdam
{
    public static int reverse(int num) {
        int rev = 0;
        
        while (num != 0) {
            int d = num % 10;
            rev = rev * 10 + d;
            num /= 10;
        }
        
        return rev;
    }
    
    public static boolean isAdam(int num) {
        int sqNum = num * num;
        int revNum = reverse(num);
        int sqRevNum = revNum * revNum;
        int rev = reverse(sqNum);
        
        return rev == sqRevNum;
    }
    
    public static boolean isPrime(int num) {
        int c = 0;
        
        for (int i = 1; i <= num; i++) {
            if (num % i == 0) {
                c++;
            }
        }
        
        return c == 2;
    }
    
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter the value of m: ");
        int m = in.nextInt();
        System.out.print("Enter the value of n: ");
        int n = in.nextInt();
        int count = 0;
        
        if (m >= n) {
            System.out.println("INVALID INPUT");
            return;
        }
        
        System.out.println("THE PRIME-ADAM INTEGERS ARE:");
        for (int i = m; i <= n; i++) {
            boolean adam = isAdam(i);
            if (adam) {
                boolean prime = isPrime(i);
                if (prime) {
                    System.out.print(i + " ");
                    count++;
                }
            }
        }
        
        if (count == 0) {
            System.out.print("NIL");
        }
        
        System.out.println();
        System.out.println("FREQUENCY OF PRIME-ADAM INTEGERS IS: " + count);
    }
}Output

Accepted Answer

importjava.util.Scanner;publicclassPrimeAdam{publicstaticintreverse(intnum) {intrev=0;while(num!=0) {intd=num%10;            rev=rev*10+d;            num/=10;        }returnrev;    }publicstaticbooleanisAdam(intnum) {intsqNum=num*num;intrevNum=reverse(num);intsqRevNum=revNum*revNum;intrev=reverse(sqNum);returnrev==sqRevNum;    }publicstaticbooleanisPrime(intnum) {intc=0;for(inti=1; inum; i++) {if(num%i==0) {                c++;            }        }returnc==2;    }publicstaticvoidmain(Stringargs[]) {Scannerin=newScanner(System.in);System.out.print("Enter the value of m:");intm=in.nextInt();System.out.print("Enter the value of n:");intn=in.nextInt();intcount=0;if(m>=n) {System.out.println("INVALID INPUT");return;        }System.out.println("THE PRIME-ADAM INTEGERS ARE:");for(inti=m; in; i++) {booleanadam=isAdam(i);if(adam) {booleanprime=isPrime(i);if(prime) {System.out.print(i+"");                    count++;                }            }        }if(count==0) {System.out.print("NIL");        }System.out.println();System.out.println("FREQUENCY OF PRIME-ADAM INTEGERS IS:"+count);    }}Output

Question 2

Question 2Write a program to declare a matrix A[][] of order (M x N) where 'M' is the number of rows and 'N' is the number of columns such that the value of 'M' must be greater than 0 and less than 10 and the value of 'N' must be greater than 2 and less than 6. Allow the user to input digits (0 - 7) only at each location, such that each row represents an octal number.Example:231(decimal equivalent of 1st row = 153 i.e. 2x82 + 3x81 + 1x80)405(decimal equivalent of 2nd row = 261 i.e. 4x82 + 0x81 + 5x80)156(decimal equivalent of 3rd row = 110 i.e. 1x82 + 5x81 + 6x80)Perform the following tasks on the matrix:Display the original matrix.Calculate the decimal equivalent for each row and display as per the format given below.Test your program for the following data and some random data:Example 1:INPUT:M = 1N = 3ENTER ELEMENTS FOR ROW 1: 1 4 4OUTPUT:FILLED MATRIXDECIMAL EQUIVALENT144100Example 2:INPUT:M = 3N = 4ENTER ELEMENTS FOR ROW 1: 1 1 3 7ENTER ELEMENTS FOR ROW 2: 2 1 0 6ENTER ELEMENTS FOR ROW 3: 0 2 4 5OUTPUT:FILLED MATRIXDECIMAL EQUIVALENT1137607210610940245165Example 3:INPUT:M = 3N = 3ENTER ELEMENTS FOR ROW 1: 2 4 8OUTPUT:INVALID INPUTExample 4:INPUT:M = 4N = 6OUTPUT:OUT OF RANGESolutionimport java.util.Scanner; public class OctalMatrix { public static void main(String args[]) { Scanner in = new Scanner(System.in); System.out.print("Enter the number of rows (M): "); int m = in.nextInt(); System.out.print("Enter the number of columns (N): "); int n = in.nextInt(); if (m <= 0 || m >= 10 || n <= 2 || n >= 6) { System.out.println("OUT OF RANGE"); return; } int a[][] = new int[m][n]; for (int i = 0; i < m; i++) { System.out.println("ENTER ELEMENTS FOR ROW " + (i + 1) + ": "); for (int j = 0; j < n; j++) { a[i][j] = in.nextInt(); if (a[i][j] < 0 || a[i][j] > 7) { System.out.println("INVALID INPUT"); return; } } } System.out.println("FILLED MATRIX DECIMAL EQUIVALENT"); for (int i = 0; i < m; i++) { int decNum = 0; for (int j = 0; j < n; j++) { decNum += a[i][j] * Math.pow(8, n - j - 1 ); System.out.print(a[i][j] + " "); } System.out.print(" " + decNum); System.out.println(); } } }Output

Accepted Answer

importjava.util.Scanner;publicclassOctalMatrix{publicstaticvoidmain(Stringargs[]) {Scannerin=newScanner(System.in);System.out.print("Enter the number of rows (M):");intm=in.nextInt();System.out.print("Enter the number of columns (N):");intn=in.nextInt();if(m0||m>=10||n2||n>=6) {System.out.println("OUT OF RANGE");return;        }inta[][]=newint[m][n];for(inti=0; im; i++) {System.out.println("ENTER ELEMENTS FOR ROW"+(i+1)+":");for(intj=0; jn; j++) {                a[i][j]=in.nextInt();if(a[i][j]0||a[i][j]>7) {System.out.println("INVALID INPUT");return;                }            }        }System.out.println("FILLED MATRIX	DECIMAL EQUIVALENT");for(inti=0; im; i++) {intdecNum=0;for(intj=0; jn; j++) {                decNum+=a[i][j]*Math.pow(8, n-j-1);System.out.print(a[i][j]+"");            }System.out.print("		"+decNum);System.out.println();        }    }}Output

Question 3

Question 3Write a program to accept a sentence which may be terminated by either '.', '?' or '!' only. The words are to be separated by a single blank space and are in UPPER CASE.Perform the following tasks:Check for the validity of the accepted sentence only for the terminating character.Arrange the words in ascending order of their length. If two or more words have the same length, then sort them alphabetically.Display the original sentence along with the converted sentence.Test your program for the following data and some random data:Example 1:INPUT:AS YOU SOW SO SHALL YOU REAP.OUTPUT:AS YOU SOW SO SHALL YOU REAP.AS SO SOW YOU YOU REAP SHALLExample 2:INPUT:SELF HELP IS THE BEST HELP.OUTPUT:SELF HELP IS THE BEST HELP.IS THE BEST HELP HELP SELFExample 3:INPUT:BE KIND TO OTHERS.OUTPUT:BE KIND TO OTHERS.BE TO KIND OTHERSExample 4:INPUT:NOTHING IS IMPOSSIBLE#OUTPUT:INVALID INPUTSolutionimport java.util.*; public class StringCheck { public static String sortString(String ipStr) { StringTokenizer st = new StringTokenizer(ipStr); int wordCount = st.countTokens(); String strArr[] = new String[wordCount]; for (int i = 0; i < wordCount; i++) { strArr[i] = st.nextToken(); } for (int i = 0; i < wordCount - 1; i++) { for (int j = 0; j < wordCount - i - 1; j++) { if (strArr[j].length() > strArr[j + 1].length()) { String t = strArr[j]; strArr[j] = strArr[j+1]; strArr[j+1] = t; } if (strArr[j].length() == strArr[j + 1].length() &&(strArr[j].compareTo(strArr[j+1]) > 0)) { String t = strArr[j]; strArr[j] = strArr[j+1]; strArr[j+1] = t; } } } StringBuffer sb = new StringBuffer(); for (int i = 0; i < wordCount; i++) { sb.append(strArr[i]); sb.append(" "); } /* * trim will remove the extra space added * to the end of the string in the loop above */ return sb.toString().trim(); } public static void main(String args[]) { Scanner in = new Scanner(System.in); System.out.println("Enter a sentence:"); String str = in.nextLine(); int len = str.length(); System.out.println(); if (str.charAt(len - 1) != '.' && str.charAt(len - 1) != '?' && str.charAt(len - 1) != '!') { System.out.println("INVALID INPUT"); return; } /* * str.substring(0, len - 1) removes the * '.', '?', '!' at the end of the string */ String sortedStr = sortString(str.substring(0, len - 1)); System.out.println(str); System.out.println(sortedStr); } }Output

Accepted Answer

importjava.util.*;publicclassStringCheck{publicstaticStringsortString(StringipStr) {StringTokenizerst=newStringTokenizer(ipStr);intwordCount=st.countTokens();StringstrArr[]=newString[wordCount];for(inti=0; iwordCount; i++) {            strArr[i]=st.nextToken();        }for(inti=0; iwordCount-1; i++) {for(intj=0; jwordCount-i-1; j++) {if(strArr[j].length()>strArr[j+1].length()) {Stringt=strArr[j];                    strArr[j]=strArr[j+1];                    strArr[j+1]=t;                }if(strArr[j].length()==strArr[j+1].length()&&(strArr[j].compareTo(strArr[j+1])>0))                {Stringt=strArr[j];                    strArr[j]=strArr[j+1];                    strArr[j+1]=t;                }            }        }StringBuffersb=newStringBuffer();for(inti=0; iwordCount; i++) {            sb.append(strArr[i]);            sb.append("");        }/** trim will remove the extra space added* to the end of the string in the loop above*/returnsb.toString().trim();    }publicstaticvoidmain(Stringargs[]) {Scannerin=newScanner(System.in);System.out.println("Enter a sentence:");Stringstr=in.nextLine();intlen=str.length();System.out.println();if(str.charAt(len-1)!='.'&&str.charAt(len-1)!='?'&&str.charAt(len-1)!='!') {System.out.println("INVALID INPUT");return;        }/** str.substring(0, len - 1) removes the* '.', '?', '!' at the end of the string*/StringsortedStr=sortString(str.substring(0, len-1));System.out.println(str);System.out.println(sortedStr);    }}Output

Solved 2020 Practical Paper ISC Computer Science