OneAndOneIs2

K&R 4.5: Add things like sin and pow to the calculator

Okay. So you just put in the math.h library and off you go. Right?

Apparently.. wrong.

It SAYS it works, but it gives me the wrong answers for the sin/cos/tan stuff.

1 s
        0.84147098
2 s
        0.90929743
3 s
        0.14112001

Must have coded it wrong.. right?

So let's try something a bit simpler. A bit of code to calculate sin(0-10):

#include <stdio.h>
#include <math.h>

int main()
{
        int i;

        for (i = 0; i < 11; i++)
                printf("sin %d = %f\n", i, sin(i));
        return 0;
}

Result?

sin 0 = 0.000000
sin 1 = 0.841471
sin 2 = 0.909297
sin 3 = 0.141120
sin 4 = -0.756802
sin 5 = -0.958924
sin 6 = -0.279415
sin 7 = 0.656987
sin 8 = 0.989358
sin 9 = 0.412118
sin 10 = -0.544021

Same numbers that my calculator code gives me.

But not the same numbers that any other scientific calculator I try gives me.

What's going on??