PPS Practical 45

• PPS(C)
• JAvA

• Aim: Write a C program to use recursive calls to evaluate F(x) = x - x^3/ 3! + x^5/ 5 ! - x^7/ 7! +… x^n/ n!.
• Code:

  //For turbo C++ remove below comments
  #include <stdio.h>
  //#include<conio.h>
  #include<math.h>
      int fact(int n){
      if (n==1){
          return 1;
      }
      return n*fact(n-1);
  }
  float series(int x, int n){
      static float sum;
      if (n==1){
          return sum+=x;
      }
      if (n%2==0){
          sum-=(pow(x,(2*n)-1)/fact((2*n)-1));
      }else{
          sum+=(pow(x,(2*n)-1)/fact((2*n)-1));
      }
      return series(x,--n);
  }
  void main()
  {
      int x,n;
      //clrscr();
      printf("for equation : x - x^3/ 3! + x^5/ 5 ! - x^7/ 7! +...+ x^n/ n! \nEnter value of x : ");
      scanf("%d",&x);
      printf("Enter value of n : ");
      scanf("%d",&n);
      printf("Sum : %f",series(x,n));
      // getch();
  }

• Output:
  

Practical 44 Practical 46