Thread: cosine series with out using math.h

I want to write a pogram which will calculate cosine series.
But I am not get the value like cos() function of math.h
Could you tell me why it is happening and any error in my code or any step mistake ?????

Code:

float cos1(float x)
      {
      int i,fact=1;
      float sum,term;
      sum=1.0;
      term=1.0;
      for(i=1;i<5;i++)
                       {
                        term=term*x*x;
                        term=term*(-1);
                        fact=factorial(2*i);
                        sum=sum+(term/fact);    
                        }
       return(sum);                      
      }

int factorial(int x)
    {
    int fact;
    if(x==1)
            return(1);
    else
            fact=x*factorial(x-1);       
    return(fact);                
    }               

also in the place of for loop i am using  do while loop but result is same 

float cos1(float x)
      {
      int i,fact=1;
      float sum,term;
      sum=1.0;
      term=1.0;
      i=1;
      do
                       {
                        term=term*x*x;
                        term=term*(-1);
                        fact=factorial(2*i);
                        sum=sum+(term/fact);    
                        i++;
                        }
       while(term>0.00001)
        return(sum);                      
      }

I copied and pasted your code and compiled it and it appears to work fine. It gives the same values as my calculator.

What kind of values does it give you?

haha funny you bring this up

http://cboard.cprogramming.com/showt...ight=maclaurin