Need help programming with Mclauren series and Taylor series!
- by user352258
Ok so here's what i have so far:
#include <stdio.h>
#include <math.h>
//#define PI 3.14159
int factorial(int n){
if(n <= 1)
return(1);
else
return(n * factorial(n-1));
}
void McLaurin(float pi){
int factorial(int);
float x = 42*pi/180;
int i, val=0, sign;
for(i=1, sign=-1; i<11; i+=2){
sign *= -1; // alternate sign of cos(0) which is 1
val += (sign*(pow(x, i)) / factorial(i));
}
printf("\nMcLaurin of 42 = %d\n", val);
}
void Taylor(float pi){
int factorial(int);
float x;
int i;
float val=0.00, sign;
float a = pi/3;
printf("Enter x in degrees:\n");
scanf("%f", &x);
x=x*pi/180.0;
printf("%f",x);
for(i=0, sign=-1.0; i<2; i++){
if(i%2==1)
sign *= -1.0; // alternate sign of cos(0) which is 1
printf("%f",sign);
if(i%2==1)
val += (sign*sin(a)*(pow(x-a, i)) / factorial(i));
else
val += (sign*cos(a)*(pow(x-a, i)) / factorial(i));
printf("%d",factorial(i));
}
printf("\nTaylor of sin(%g degrees) = %d\n", (x*180.0)/pi, val);
}
main(){
float pi=3.14159;
void McLaurin(float);
void Taylor(float);
McLaurin(pi);
Taylor(pi);
}
and here's the output:
McLaurin of 42 = 0
Enter x in degrees:
42
0.733038-1.00000011.0000001
Taylor of sin(42 degrees) = -1073741824
I suspect the reason for these outrageous numbers goes with the fact that I mixed up my floats and ints? But i just cant figure it out...!! Maybe its a math thing, but its never been a strength of mine let alone program with calculus. Also the Mclaurin fails, how does it equal zero? WTF! Please help correct my noobish code. I am still a beginner...
