Basics of C programming

Discussion in 'Programming' started by BowenDaniel, Apr 23, 2013.

0
  1. #1
    I composed code for sinx
    Anyway it is demonstrating yield as INF
    Why INF?? what's off with code ....
    plz help
    Code:
    #include<stdio.h>
#include<math.h>
int main()
{
float x,t=0,sum;
int i,n,sig=1;
printf("Input X,N");
scanf("%f %d",&x,&n);
x*=(3.14/180);
sum=x;
for(i=0;i<n;i++)
{
sig*=-1;
t=(sig*x*x)/(2*i*(2*i+1));
sum+=t;
}
printf("SIN(X) = %f\n",sum);
return 0;
}
    Code (markup):

     
    BowenDaniel, Apr 23, 2013 IP
  2. nhl4000

    nhl4000 Well-Known Member

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    #2
    What you are looking for is:
    #include<stdio.h>
#include<math.h>
 
int main() {
 
float value, x, t, sum;
int i, n, sign;
 
printf("Input x (degrees), N:\n");
scanf("%f %d",&x,&n);
value = x;
x *= (3.14159/180);
t = x; 
sum = x; 
for(i=1;i<n+1;i++) { 
  t = (t * pow((double) (-1), (double) (2 * i - 1)) * x * x) / (2 * i * (2 * i + 1)) ; 
  sum = sum + t;
} 
printf("SIN(%.3f) = %f\n", value, sum);
sum = sin(x);
printf("Math library: SIN(%.3f) = %f\n", value, sum);
return 0;
}
    Code (markup):
     
    nhl4000, Apr 25, 2013 IP