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 /* 1. Write a Java Program to accept some decimal numbers from the user and display the round off value of those numbers */
public class Round_Number { void Round(int n,double num[]) { double a[] = new double[10]; for(int i = 0;i<n;i++) { a[i] = num[i]; int x = (int)a[i]; if((a[i] - x) > 0.5) { int m = x + 1; System.out.println(m); } else System.out.println(x); } } }
/* 2. Wrire a Java Program to accept 10 numbers form the user and print them in a reverse order */
class Reverse_Number { public void Rec_Num() { int num[] = new int[10]; for(int i = 0; i<10; i++) num[i] = i + 1; for(int i = 9; i >=0 ; i--) { System.out.println(num[i]); } } }
/* 3. Write a java Program to accept some numbers from the user and display only the even numbers among them */
public class Even { public void Even_Number(int num,int n[]) { int a[] = new int[20]; int ev[] = new int[20]; int j = 0; for(int i = 0; i< num;i++) { a[i] = n[i]; if(a[i] % 2 == 0) { ev[j] = a[i]; j++; } } for(int i = 0;i<j;i++) System.out.println(ev[i]); } }
/* 4. Write a Java Program to accept some students name, marks in subject-1, subject-2, subject-3 and display the total and the average of three subjects */
public class Students_Report { public void Marks(int n,String name[], double Sub1[], double Sub2[], double Sub3[]) { double total[] = new double[10]; double avg[] = new double[10];
for(int i = 0;i<n;i++) { total[i] = Sub1[i] + Sub2[i] + Sub3[i] ; avg[i] = total[i] / 3; System.out.print("\n\n"+name[i]); System.out.print("\t\t"+Sub1[i]); System.out.print("\t\t"+Sub2[i]); System.out.print("\t\t"+Sub3[i]); System.out.print("\t\t"+total[i]); System.out.print("\t\t"+avg[i]); } } }
/* 5. Write a Java Program to accept some numbers in first array and some numbers in second array , store and print the sum of these respective numbers in the third array */
public class Sum { public void Sum_Array(int n,int a[], int b[]) { int c[] = new int[10]; for(int i = 0 ;i<n;i++) { c[i] = a[i] + b[i]; System.out.println(c[i]); } } }
/* 6. Write a Java Program to accept some students Name and Marks in Subject-1 , Subject-2, and Subject-3 and print them in a neat format */
class Marks { public void Marks(int n,String name[], double Sub1[], double Sub2[], double Sub3[]) { double total[] = new double[10]; double avg[] = new double[10]; for(int i = 0;i<n;i++) { total[i] = Sub1[i] + Sub2[i] + Sub3[i] ; avg[i] = total[i] / 3; System.out.println("Student Name :"+name[i]); System.out.println("Subject - I :"+Sub1[i]); System.out.println("Subject - II :"+Sub2[i]); System.out.println("Subject - III :"+Sub3[i]); System.out.println("Total :"+Sub3[i]); System.out.println("Average :"+Sub3[i]); } } }
/* 7. Write a Java Program to accept some numbers in first array and some in second array, store the sum in the third array and print them */
public class Sum_Array { public void Sum_Array(int n,int a[], int b[]) { int c[] = new int[10]; for(int i = 0 ;i<n;i++) { c[i] = a[i] + b[i]; System.out.println(c[i]); } } }
/* 8. Write a Java Program to take an integer argument n and print the letter 'a' as shown in the following pattern (For n = 5, the output should be as shown below) a a a a a a a a a a a a a a a a a a a a a a a a a
*/
class Pattern_a { public void Pat(int n) { int i = 0,j = 0,c,k; c = n -1; for(i = 1; i<=n;i++) { for(k = 1;k<=c;k++) System.out.print(" "); for(j = 1;j<=i;j++) System.out.print(" a"); System.out.println(); c = c - 1; } c = c+ 2; for(i = n- 1; i>=1; i--) { for(k = 1;k<=c;k++) System.out.print(" "); for(j = 1;j<=i;j++) System.out.print(" a"); System.out.println(); c = c+ 1; } } }
/* 9. Write a Java Program to develop a Simple Calculator */
class Calculator { public void Calc(double op1,double op2,char ch) { double res = 0.0; switch(ch) { case '+' : res = op1 + op2 ; break; case '-' : res = op1 - op2 ; break; case '*' : res = op1 * op2 ; break; case '/' : if(op2 == 0) System.out.println("Stupid,Division by 0 is not possible. Dont u know that!. Learn Mathematics and come"); res = op1 / op2 ; break; case '%' : if(op2 == 0) System.out.println("Stupid,Modulus is not possible when the second operand is 0 Dont u know that!. Learn Mathematics and come"); res = op1 % op2; break;
default : System.out.println("Stupid, Enter the correct operator"); } System.out.println("\n Result = "+res); } }
/* 10. Write a Java Program to input an integer number and print them as shown in the followqing pattern ( For n = 5 the output shoul be as shown below )
1 1 2 1 2 3 1 2 3 4 1 2 3 4 5 1 2 3 4 1 2 3 1 2 1 */
class Pattern_No { public void Pat(int n) { int i = 0,j = 0,c,k; c = n -1; for(i = 1; i<=n;i++) { for(k = 1;k<=c;k++) System.out.print(" "); for(j = 1;j<=i;j++) System.out.print(j); for(j =i-1;j>=1;j--) System.out.print(j); System.out.println(); c = c - 1; } c = c+ 2; for(i = n- 1; i>=1; i--) { for(k = 1;k<=c;k++) System.out.print(" "); for(j = 1;j<=i;j++) System.out.print(j); for(j = i-1;j>=1;j--) System.out.print(j); System.out.println(); c = c+ 1; } } }
/* 11. Write a Java program to accept an integer number and print the pairs of twin primes.
Twin primes : (3,5), (5,7), (11,13) etc A pair of primes is said to be twin primes if and only if the difference between them is 2*/
class Twin { void twinPrime(int lim)throws ArithmeticException { int n,a =1,b =0,flag,i = 0; for(n= 2;n<=lim;n++) { flag =0; for(i = 2;i<=n/2;i++) if(n % i == 0) { flag = 1; break; } if(flag == 0) { b = n; if((b-a) == 2) System.out.println("Twin Pair ("+a +","+b+")"); a = b; } } } }
/* 12. Write a Java Program to accept an integer number and print the alphabets as shown below (For n = 4 the output should be as shown below )
abcdcba abc cba ab ba a a ab ba abc cba abcdcba
*/ class Pattern_abcd { public void Pat(int n) { int i,j,c,k; char ch; c =1; ch = 'a'; for(i = 1;i<=n;i++) System.out.print(ch++); --ch; for(i=1;i<n;i++) System.out.print(--ch); System.out.println(); for(i = n - 1; i>= 1; i--) { ch = 'a'; for(j = 1;j<=i;j++) System.out.print(ch++); for(k=1;k<=c;k++) System.out.print(" "); for(j = 1; j<=i;j++) System.out.print(--ch); System.out.println(); c = c + 2; } c = c - 4; for(i = 2; i<n;i++) { ch = 'a'; for(j = 1;j<=i;j++) System.out.print(ch++); for(k = 1;k<=c;k++) System.out.print(" "); for(j = 1;j<=i;j++) System.out.print(--ch); System.out.println(); c = c+ 2; } ch = 'a'; for(i = 1;i<=n;i++) System.out.print(ch++); --ch; for(i = 1;i<n;i++) System.out.print(--ch); } }
/* 13. Write a java program to accept the values of 3 sides and check whether the triangle is a right angled triangle or not */
class Right_Angle { void accpet(double a, double b, double c) { if(a > b && a > c) { if((a * a) == (b * b) + (c * c)) System.out.println("It is a right angled triangle "); else System.out.println("It is not aright angled triangle "); } if(b > a && b > c ) { if((b * b) == ( a * a) + (c * c)) System.out.println("It is a right angles triangle"); else System.out.println("It is not a right angles triangle"); } if(c > a && c > b ) { if((c * c) == ( b * b) + (a * a)) System.out.println("It is a right angles triangle"); else System.out.println("It is not a right angles triangle"); } } }
/* 14. Write a java program to accept two strings and display the largest string */
class Largest_String { void Accept_String(String first, String second) { if(first.length() > second.length()) System.out.println("The Largest String is :"+first); else System.out.println("The Largest String is :"+second); } }
/* 15. Write a java program to accept the previous and present electric meter reading and display the electric bill to be paid for that month */
class electricity_Temp { void calculate(String name, int Prv_Unit, int Present_Unit) { int units = Present_Unit - Prv_Unit; double charge = 0; if(units <= 100) charge = units * 0.4; if(units <=300) charge = 100 * 0.40 + 200 + (units - 100) * 0.6; if(units >300) charge = 100 * 0.40 + 200 * 0.60 + (units - 300) * 1; double netcharge = charge + 250 ; System.out.println(); System.out.println("\t ********************************************"); System.out.println("Name : "+name); System.out.println("Previous Units : "+Prv_Unit); System.out.println("Present Units : "+Present_Unit); System.out.println("Consumed Units : "+units); System.out.println("\n Net amount to be paid :" +netcharge); } }
/* 16. Write a java program to accept the type of cloth ( type M for Mill cloth and H for Handloom item ), amount of cloth and print the amount to be paid after discount */
class Discount { void Accept_Purchase_Amount(double amt, char type) { double d,s; switch(type) { case 'M' : if(amt <= 1000) { d = (2.0 / 100 ) * amt; s = amt - d; System.out.println("Amount to be payed ="+s); } else if(amt > 1000 && amt<= 5000) { d = (20.0 / 100 ) * amt; s = amt - d; System.out.println("Amount to be payed ="+s); } else if(amt > 5001 && amt<= 10000) { d = (40.0 / 100 ) * amt; s = amt - d; System.out.println("Amount to be payed ="+s); } else if(amt > 10000) { d = (40.0 / 100 ) * amt; s = amt - d; System.out.println("Amount to be payed ="+s); } break;
case 'H' : if(amt <= 1000) { d = (5.0 / 100 ) * amt; s = amt - d; System.out.println("Amount to be payed ="+s); } else if(amt > 1000 && amt<= 5000) { d = (25.0 / 100 ) * amt; s = amt - d; System.out.println("Amount to be payed ="+s); } else if(amt > 5001 && amt<= 10000) { d = (50.0 / 100 ) * amt; s = amt - d; System.out.println("Amount to be payed ="+s); } else if(amt > 10000) { d = (60.0 / 100 ) * amt; s = amt - d; System.out.println("Amount to be payed ="+s); } break; default : System.out.println("No discount available "); } } }
/* 17. Write a java program to accept a string from the keyboard and print the no of spaces in it */
class Spaces {
void accept_display(String str) { int len; int count = 0; len = str.length(); for(int i = 0; i<len; i++) { if(str.charAt(i) == ' ') count++; } System.out.println("The no of spaces in the string is :"+count); } }
/* 18. Write a program to accept a line of text and print the no of times each of the vowels appears in the text */
class Frequency { void accept_print(String str) { int a =0,e = 0, i = 0, o = 0, u = 0; int len = str.length(); for(int j = 0; j< len ;j++) { switch(str.charAt(j)) { case 'a': case 'A': a++; break; case 'e': case 'E': e++; break; case 'i': case 'I': i++; break;
case 'o': case 'O': o++; break;
case 'u': case 'U':
u++; break; } } System.out.println("The Number of time the vowel a occurs is :"+a); System.out.println("The Number of time the vowel a occurs is :"+e); System.out.println("The Number of time the vowel a occurs is :"+i); System.out.println("The Number of time the vowel a occurs is :"+o); System.out.println("The Number of time the vowel a occurs is :"+u);
} }
/* 19. Write a java program to accept two integer variables x , y and evaluate the expression (4x + y ) if x > 0 else evaluate (4x - y) and print the result */
class Expression { void accept(int x, int y) { int result; if(x > 0) result = 4 * x + y; else result = 4 * x - y; System.out.println("The Result of the expression is :"+result); } }
/* 20. Write a java program to accept the salary, calculate and dispaly the income tax for that perticular salary */
class Income { void accept(double gross) { double t; if(gross <= 100000) { t = (0.0 /100) * gross ; System.out.println("TAX = "+t); } else if(gross > 100001 && gross <= 500000) { t = 1000 + (10.0 /100) * (gross - 100000); System.out.println("TAX = "+t); } else if(gross > 500001 && gross <= 800000) { t = 5000 + (20.0 /100) * (gross - 500000); System.out.println("TAX = "+t); } else if(gross > 800000 ) { t = 10000 + (30.0 /100) * (gross - 800000); System.out.println("TAX = "+t); } } }
/* 21. Write a Java program to accept an integer number and print the pairs of twin primes.
Twin primes : (3,5), (5,7), (11,13) etc A pair of primes is said to be twin primes if and only if the difference between them is 2*/
class Twin { void twinPrime(int lim)throws ArithmeticException { int n,a =1,b =0,flag,i = 0; for(n= 2;n<=lim;n++) { flag =0; for(i = 2;i<=n/2;i++) if(n % i == 0) { flag = 1; break; } if(flag == 0) { b = n; if((b-a) == 2) System.out.println("Twin Pair ("+a +","+b+")"); a = b; } } } }
/* 22. Write a java program to accept the values of 3 sides and check whether the triangle is a right angled triangle or not */
class Right_Angle { void accpet(double a, double b, double c) { if(a > b && a > c) { if((a * a) == (b * b) + (c * c)) System.out.println("It is a right angled triangle "); else System.out.println("It is not aright angled triangle "); } if(b > a && b > c ) { if((b * b) == ( a * a) + (c * c)) System.out.println("It is a right angles triangle"); else System.out.println("It is not a right angles triangle"); } if(c > a && c > b ) { if((c * c) == ( b * b) + (a * a)) System.out.println("It is a right angles triangle"); else System.out.println("It is not a right angles triangle"); } } }
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