万年历程序debug遇到的奇怪现象

#include <stdio.h> #include <stdlib.h> #include <string.h> #define uint32 unsigned int #define int32 int #define uint16 unsigned short #define int16 short #define uint8 unsigned char #define int8 char #define CAL_Debug #ifdef CAL_Debug #define debug printf #else #define debug #endif /* * AD = Actual day * BD = Basic day * AD = BD + C(run day) * * */ uint16 CalMonthDays(uint8 month); uint16 ErrorCorrection(uint16 year,uint8 month,uint16 day); /***************************************** * * func:CalBasicDay() * input:year,month,day * output:days from gongyuan 1 year * * **************************************/ uint32 CalBasicDay(uint16 year,uint8 month,uint16 day) { uint32 days = 0; uint32 correctDays = 0; days = (year-1)*365 + CalMonthDays(month) + day; correctDays = ErrorCorrection(year,month,day); if(month>2&&(year%4==0)) { days += 1; } //return a local var,is it will cause problem?? //TODO: return days+correctDays; } /******************************************* * * func:CalMonthDays() * intput:month * output:days from January * ******************************************/ uint16 CalMonthDays(uint8 month) { uint i = 0; uint8 monthOfDay[12] = {31,28,31,30,31,30,31,31,30,31,30,31}; uint16 days = 0; if(month == 1) return 0; for(i=0; i<month-1; i++) { days += monthOfDay[i]; } printf("until this month,elipes days is:%d/n",days); return days; } /****************************************** * * @func:ErrorCorrection() * @input: year * @output: correct value for calulate days * *****************************************/ uint16 ErrorCorrection(uint16 year,uint8 month,uint16 day) { uint16 days = 0; uint16 sumDays = 0; uint8 i= 0; uint8 centryCount = 0; centryCount = year%100 - 16; for(i=0;i<centryCount;i++) { if(year%4 != 0) sumDays += 1; } debug("until this centry,accumulate correct days:%d/n",sumDays); if((year<1582)&&(month<=10&&(day<14))) { return 0; } else if((year>1582 && year<1699) && (month>=10 && month< 12) && (day<=15 && day>=31)) { return 10; } else { return 10+sumDays; } } uint32 main(int32 argc,char* argv[]) { uint16 year = 0; uint8 month = 0; uint16 day = 0; uint32 days = 0; int i; for(i=0;i<argc;i++) { debug("arg[%d]:%s/n",i,argv[i]); } if(!(argv[1]&&argv[2]&&argv[3])) { debug("Pleae input argument of year,month,day/n"); return 0; } year = atoi(argv[1]); month = atoi(argv[2]); day = atoi(argv[3]); days = CalBasicDay(year,month,day); debug("The total days of %d-%d-%d is:%d/n",year,month,day,days); return 1; }

 

程序运行结果一直不正确，用GDB进行debug，发现很奇怪的问题。

进入main函数中，变量明明是初始化为0，但是在GDB中查看是一些莫明其妙的值。

如下：

ubuntu:~/programe/linuxc$ gdb -q ./a.out
Reading symbols from /home/wupeng/programe/linuxc/a.out...done.
(gdb) l
122   
123    uint32 main(int32 argc,char* argv[])
124    {
125        uint16 year = 0;
126        uint8 month = 0;
127        uint16 day = 0;
128        uint32 days = 0;
129        int i;
130       
131        unsigned short year = 0;
(gdb) set args 1701 2 1    //传入参数
(gdb) break main              //设置断点
Breakpoint 1 at 0x80486f3: file calendar.c, line 131.
(gdb) r
Starting program: /home/wupeng/programe/linuxc/a.out 1701 2 1

Breakpoint 1, main (argc=4, argv=0xbffff394) at calendar.c:131
131        unsigned short year = 0;
(gdb) print year
$1 = 62184
(gdb)