exp3c.c

来自「TI的DSP C55X的应用程序」· C语言 代码 · 共 36 行

/* --------------------------------------------

    exp3c.c              
	
    Understand overflow
	
----------------------------------------------- */
	     
	     
#define	BUF_SIZE 40

int sineTable[BUF_SIZE]={
0x0000,0x000f,0x001e,0x002d,0x003a,0x0046,0x0050,0x0059,
0x005f,0x0062,0x0063,0x0062,0x005f,0x0059,0x0050,0x0046,
0x003a,0x002d,0x001e,0x000f,0x0000,0xfff1,0xffe2,0xffd3,
0xffc6,0xffba,0xffb0,0xffa7,0xffa1,0xff9e,0xff9d,0xff9e,
0xffa1,0xffa7,0xffb0,0xffba,0xffc6,0xffd3,0xffe2,0xfff1}; 
			
extern int ovftest(int, int *); 


void main()
{
    int ovrflow_flag;  
    int *ptr=sineTable;

    while(1)
    {	         
        ovrflow_flag=0;
        ovrflow_flag=ovftest(ovrflow_flag, ptr); 
	
        if (ovrflow_flag != 0)
            ovrflow_flag=ovftest(ovrflow_flag, ptr);
    }  	
}