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Feb 21st, 2017
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  1. #include<stdio.h>
  2. #include<math.h>
  3.  
  4. float f(float x){
  5. return exp(x);
  6. }
  7.  
  8. int main(){
  9.  
  10. float a,b,n,h,sum1=0,sum2=0,sum,y0,yn;
  11. int i;
  12.  
  13. printf("Enter the upper limit : ");
  14. scanf("%f",&b);
  15. printf("Enter the lower limit : ");
  16. scanf("%f",&a);
  17. printf("Enter the number of intervals : ");
  18. scanf("%f",&n);
  19.  
  20. //step length
  21. h=(b-a)/n;
  22.  
  23. y0=f(a+0*h);
  24. yn=f(a+n*h);
  25.  
  26. for(i=1; i<n; i++)
  27. if(i%2 == 0)
  28. sum1 = sum1 + f(a+i*h);
  29. else
  30. sum2 = sum2 + f(a+i*h);
  31.  
  32. sum =(h/3)*(y0 + yn + 2*sum1 +4*sum2);
  33.  
  34. printf("Answer : %.2f",sum);
  35.  
  36. getch();
  37. return 0;
  38. }
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