program doesnt enter function

This is a discussion on program doesnt enter function within the C Programming forums, part of the General Programming Boards category; hello everyone, i wrote a code in C that suppose to calculate COS of an angle. i dont need help ...

  1. #1
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    program doesnt enter function

    hello everyone, i wrote a code in C that suppose to calculate COS of an angle.
    i dont need help with the writing, i just have one problem, for some reason the program doesnt enter the function cosApprox, it suppose to enter the function and save the result in sum_column , but it just skips it, does someone knows why?

    Thanks.

    Code:
    #include <stdio.h>
    #include <conio.h>
    #include <math.h>
    
    #define PI 3.1415927
    
    double power(double a, int b);
    
    long factorial(int n);
    
    double cosElement(double x, int i);
    
    double cosApprox(double x, int i);
    
    int main()
    {
    	 double x;  /* Angle variable */
    	 int k;     /* Number of elements variable */
    	 double sum_column; /* Sum of all elements variable */
    
    	 clrscr();
    
    	 printf("\nEnter an angle (in Radians):");
    	 scanf("%lf", &x);
    	 printf("\nEnter number of elements:");
    	 scanf("%d", &k);
    	 while(k<0)
    	 {
    		printf("Erroneous Input. Please enter number of elements (k>=0):");
    		scanf("%d", &k);
    	 }
    
    	 sum_column=cosApprox(x, k); /* a function to calculate the sum of elements */
    
    	 printf("The value of Cos(x) is: %.4lf", 1+sum_column);
    
    	 getch();
    	 return 0;
    }
    	 double cosApprox(double x, int i)
    	 {
    		 double sum=0;
    
    		 for(i=i;i>0;i--)
    		 {
    
    			 sum=sum+cosElement(x, i);
    		 }
    		 return sum;
    	 }
    	 double cosElement(double x, int i) /* a function to calculate the element in the i place of the column */
    {
    	 double element;
    	 element=pow((-1),i)*power(x,i)/factorial(i);
    
    	 return element;
    }
    
    
    	 long factorial(int n)  /* a function to calculate the factorial of a number */
    {
    	 long sum_f=2*n;
    	 int i;
    
    	 for(i=2*n;i>1;i--)
    	 {
    		 sum_f=sum_f*(2*n-1);
    	 }
    	 return sum_f;
    }
    
    	 double power(double a, int b) /* a function to calculate x^2k */
    {
    	 double power;
    
    	 power=pow(a,2*b);
    
    	 return power;
    }

  2. #2
    and the Hat of Guessing tabstop's Avatar
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    It's hard to say why it skips it, given that it does not, in fact, skip the function at all, but instead executes it.

  3. #3
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    That's God punishing you for your indentation style.

    Seriously, it's going there - your logic is bad, but it's going there. Math is above my pay grade, but it's stepping nicely right into cosApprox().

  4. #4
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    i used the debugger and it totally ignored the function, it just returned a garbage value and didnt enter the function.

  5. #5
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    You pressed F8, instead of F7.

    F8 skips over going into the function. F7 will follow the code, into any function.

    Try again, it's going there. I wouldn't lie.

    OK, I might lie, but only a little white lie, not a big programming lie.

    OK, would you believe I might lie a big black lie, but I'd feel bad about it, and wouldn't do it about programming, anyway.

    OK, would you believe ...

  6. #6
    DESTINY BEN10's Avatar
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    yes, Adak is right.the program is entering the function.when i executed the code , it's also giving the answer.for eg,
    for angle(in radians)=1.0476(PI/3), k=7
    cos(x)=0.4623.

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