复习基础知识的时候改写的一个例题

文档创建日期：2010-02-15

]// 求在1到180度之间，每隔1度输出一个正弦值的算法
// The begining of C program: eg05-01.c.
// Header files included.
#include <stdio.h>
#include <math.h>
// Macro definition.
#define PI 3.1415926
// No.1: Subroutine: double rounding ( double d_num );
double rounding ( double d_num )
{
long int    temp;
temp = (long int) (d_num * 10000);
temp = (long int) ((d_num*10000 - temp)*2 + temp);
d_num = temp / 10000.0;

return  (d_num);
}
// No.2: Subroutine: double Radian_Converse ( double angle );
double Radian_Converse ( double angle )
{
angle = (PI * angle) / 180;
return  (angle);
}
// Main function's declaration.
int  main ( void )
{
unsigned int    i=0;
double    y=0.0;
printf ( "The result is:/n" );
for ( i=1; i<=180; i++ )
{
y = sin(Radian_Converse(i*1.0));
y = rounding (y);
printf ( "/t%-.4lf", y );
if ( (i%10) == 0 )
printf ( "/n" );
}
printf ( "/n" );

return  (0);
}
// The end of C program: eg05-01.c.

以下的输出结果可以直接用到数学的查表求值 ^_^

The result is:

0.0175 0.0349 0.0523 0.0698 0.0872 0.1045 0.1219 0.1392 0.1564 0.1736

0.1908 0.2079 0.2250 0.2419 0.2588 0.2756 0.2924 0.3090 0.3256 0.3420

0.3584 0.3746 0.3907 0.4067 0.4226 0.4384 0.4540 0.4695 0.4848 0.5000

0.5150 0.5299 0.5446 0.5592 0.5736 0.5878 0.6018 0.6157 0.6293 0.6428

0.6561 0.6691 0.6820 0.6947 0.7071 0.7193 0.7314 0.7431 0.7547 0.7660

0.7771 0.7880 0.7986 0.8090 0.8192 0.8290 0.8387 0.8480 0.8572 0.8660

0.8746 0.8829 0.8910 0.8988 0.9063 0.9135 0.9205 0.9272 0.9336 0.9397

0.9455 0.9511 0.9563 0.9613 0.9659 0.9703 0.9744 0.9781 0.9816 0.9848

0.9877 0.9903 0.9925 0.9945 0.9962 0.9976 0.9986 0.9994 0.9998 1.0000

0.9998 0.9994 0.9986 0.9976 0.9962 0.9945 0.9925 0.9903 0.9877 0.9848

0.9816 0.9781 0.9744 0.9703 0.9659 0.9613 0.9563 0.9511 0.9455 0.9397

0.9336 0.9272 0.9205 0.9135 0.9063 0.8988 0.8910 0.8829 0.8746 0.8660

0.8572 0.8480 0.8387 0.8290 0.8192 0.8090 0.7986 0.7880 0.7771 0.7660

0.7547 0.7431 0.7314 0.7193 0.7071 0.6947 0.6820 0.6691 0.6561 0.6428

0.6293 0.6157 0.6018 0.5878 0.5736 0.5592 0.5446 0.5299 0.5150 0.5000

0.4848 0.4695 0.4540 0.4384 0.4226 0.4067 0.3907 0.3746 0.3584 0.3420

0.3256 0.3090 0.2924 0.2756 0.2588 0.2419 0.2250 0.2079 0.1908 0.1736

0.1564 0.1392 0.1219 0.1045 0.0872 0.0698 0.0523 0.0349 0.0175 0.0000