using System;publicclassExercise8{publicstaticvoidMain(){intnum1,num2,num3;// input data
Console.Write("Input the 1st number :");num1= Convert.ToInt32(Console.ReadLine());
Console.Write("Input the 2nd number :");num2= Convert.ToInt32(Console.ReadLine());
Console.Write("Input the 3rd number :");num3= Convert.ToInt32(Console.ReadLine());// conditionif(num1>num2){if(num1>num3){
Console.Write("1st Number is the greatest. \n\n");}else{
Console.Write("3rd Number is the greatest. \n\n");}}elseif(num2>num3)
Console.Write("2nd Number is the greatest. \n\n");else
Console.Write("3rd Number is the greatest. \n\n");}}
using System;publicclassAreaOfTriangle{publicstaticvoidMain(){
Console.Write("Enter the Base:");doubleBase= Convert.ToDouble(Console.ReadLine());
Console.Write("Enter the Height:");doubleHeight= Convert.ToDouble(Console.ReadLine());doubleArea=(Base*Height)/2;
Console.Write("Area of a Triangle = "+Area);
Console.ReadKey();}}
3. Swapping number
using System;namespaceswappin_number{classswapping_number{publicstaticvoidMain(string[]args){inta=5;intb=10;intc= a;a=b;b=c;
Console.WriteLine("swapping a :"+a);//swapping : 10
Console.WriteLine("swapping b :"+b);//swapping : 5}}}
4. Quadratic equation ax2+bx+c=0
using System;publicclassExercise11{publicstaticvoidMain(){// variable declarationinta,b,c;doubled,x1,x2;
Console.Write("Input the value of a : ");a= Convert.ToInt32(Console.ReadLine());
Console.Write("Input the value of b : ");b= Convert.ToInt32(Console.ReadLine());
Console.Write("Input the value of c : ");c= Convert.ToInt32(Console.ReadLine());// quadratic lawd=b*b-4*a*c;if(d==0){
Console.Write("Both roots are equal.\n");x1=-b/(2.0*a);x2=x1;
Console.Write("First Root1= {0}\n",x1);
Console.Write("Second Root2= {0}\n",x2);}elseif(d>0){
Console.Write("Both roots are real and diff-2\n");x1=(-b+Math.Sqrt(d))/(2*a);x2=(-b-Math.Sqrt(d))/(2*a);
Console.Write("First Root1= {0}\n",x1);
Console.Write("Second Root2= {0}\n",x2);}else
Console.Write("Root are imeainary;");}}
5. Prime number 1 to 50
using System;publicclassExercise34{publicstaticvoidMain(){//variable declarationintnum,i,ctr,first_num,second_num;//Input prime number
Console.Write("Input 1st number: ");first_num= Convert.ToInt32(Console.ReadLine());
Console.Write("Input 2nd number: ");second_num= Convert.ToInt32(Console.ReadLine());
Console.Write("Prime numbers between {0} and {1} are : \n",first_num,second_num);//Condition & Loopfor(num=first_num;num <= second_num;num++){ctr=0;for(i=2;i <= num/2;i++){if(num%i==0){ctr++;break;}}if(ctr==0&&num!=1)
Console.Write("{0} ",num);}
Console.Write("\n");}}
6. Fibonacci series
using System;publicclassFibonacciExample{publicstaticvoidMain(string[]args){intn1=0,n2=1,n3,i,number;
Console.Write("Enter the number of elements: ");number=int.Parse(Console.ReadLine());
Console.Write(n1+""+n2+"");//printing 0 and 1 for(i=2;i<number;++i)//loop starts from 2 because 0 and 1 are already printed {n3=n1+n2;
Console.Write(n3+"");n1=n2;n2=n3;}}}
7. Factorial number
// C# program to find factorial// of given numberusing System;classTest{// method to find factorial// of given numberstaticintfactorial(intn){if(n==0)return1;returnn* factorial(n-1);}// Driver methodpublicstaticvoidMain(){intnum=5;
Console.WriteLine("Factorial of "+num+" is "+ factorial(5));}}
8. Check any prime number
using System;publicclassPrimeNumberExample{publicstaticvoidMain(string[]args){intn,i,m=0,flag=0;
Console.Write("Enter the Number: ");n=int.Parse(Console.ReadLine());m=n/2;for(i=2;i <= m;i++){if(n%i==0){
Console.Write("Number is not Prime.");flag=1;break;}}if(flag==0)
Console.Write("Number is Prime.");}}
9. Character, number, special character
using System;namespacecharacters_specialChar_number{classcharacters_specialChar_number{publicstaticvoidMain(string[]args){stringstr;intalphabet,number,specialChar,i,l;alphabet=number=specialChar=i=0;
Console.Write("Write Somethig : ");str= Console.ReadLine();l= str.Length;while(i<l){if((str[i]>='a'&& str[i]<='z')||(str[i]>='A'&& str[i]<='Z')){alphabet++;}elseif(str[i]>='0'&& str[i]<='9'){number++;}else{specialChar++;}i++;}
Console.WriteLine("Aphabet is = {0}\n", alphabet);
Console.WriteLine("Number is = {0}\n", number);
Console.WriteLine("Special Character is = {0}\n", specialChar);}}}
10. 2+4+6+...n find sum series
using System;classProgram{staticvoidMain(string[]args){intn=10;// change this to the desired value of nintresult=0;for(inti=2;i <= n;i+=2){result+=i;}
Console.WriteLine("Summation series: 2+4+6+...+"+n+" = "+result);}}
11. 1+3+5+...n find sum series
using System;classProgram{staticvoidMain(string[]args){intn=10;// change this to the desired value of nintresult=0;for(inti=1;i <= n;i+=2){result+=i;}
Console.WriteLine("Summation series: 1+3+5+...+"+n+" = "+result);}}
12. 1+2+3+4+...n find sum series
using System;classProgram{staticvoidMain(string[]args){intn=10;// change this to the desired value of nintresult=0;for(inti=1;i <= n;i++){result+=i;}
Console.WriteLine("Summation series: 1+2+3+4+...+"+n+" = "+result);}}
13. 1(3)+2(3)+3(3)+...n find sum series
using System;classProgram{staticvoidMain(string[]args){intn=3;// change this to the desired value of nintresult=0;for(inti=1;i <= n;i++){result+=i*i*i;}
Console.WriteLine("Summation series: 1^3 + 2^3 + 3^3 + ... + "+n+"^3 = "+result);}}
14. 1(2)+2(2)+3(2)+...n find sum series
using System;classProgram{staticvoidMain(string[]args){intn=3;// change this to the desired value of nintresult=0;for(inti=1;i <= n;i++){result+=i*i;}
Console.WriteLine("Summation series: 1^2 + 2^2 + 3^2 + ... + "+n+"^2 = "+result);}}