xilinx zynq7020通过ps uart实现简单计算器

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/*

helloworld.c: simple test application

This application configures UART 16550 to baud rate 9600.
PS7 UART (Zynq) is not initialized by this application, since
bootrom/bsp configures it to baud rate 115200




| UART TYPE   BAUD RATE                        |



uartns550   9600
uartlite    Configurable only in HW design
ps7_uart    115200 (configured by bootrom/bsp)

*/

#include <stdio.h>

#include "platform.h"

#include "xil_printf.h"

#include "math.h"
double calculator();
int main()

{

init_platform();
print(&#34;Hello World\n\r&#34;);
calculator();
cleanup_platform();
return 0;

}
double calculator()

{

// 分别存放第一个操作数和第二个操作数以及结果的变量

double x1,x2,result;
// 存放运算符的变量
char m;

while(1)
{
    printf(&#34;请输入第一个数：\n&#34;);
    // 下面这得注意，接收double型的数据得用lf%，接收float用f%
    scanf(&#34;%lf&#34;,&amp;x1);

    printf(&#34;请输入运算操作（+ - * /）：\n&#34;);
    m = getchar();
    printf(&#34;\n&#34;);

    printf(&#34;请输入第二个数：\n&#34;);
    scanf(&#34;%lf&#34;,&amp;x2);

    switch(m)
    {
        case &#39;+&#39;:
            printf(&#34;加法\n&#34;);
            result = x1 + x2;
            printf(&#34;%lf + %lf = %lf\n&#34;,x1,x2,result);
            break;

        case &#39;-&#39;:
            printf(&#34;减法\n&#34;);
            result = x1 - x2;
            printf(&#34;%lf - %lf = %lf\n&#34;,x1,x2,result);
            break;

        case &#39;*&#39;:
            printf(&#34;乘法\n&#34;);
            result = x1 * x2;
            printf(&#34;%lf * %lf = %lf\n&#34;,x1,x2,result);
            break;

        case &#39;/&#39;:
            printf(&#34;除法\n&#34;);
            if(x2 == 0)
            {
                printf(&#34;除数不能为0.\n&#34;);
            }
            else
            {
                result = x1 / x2;
                printf(&#34;%lf / %lf = %lf\n&#34;,x1,x2,result);
            }
            break;

        default:
            break;
    }
}

return 0.0;

}