sprintf 组包 sscanf解包

void test01()  
{      
int year = 2019;      
int mon = 8;      
int day = 1;        
//需求：将2019 8 1组成 2019年8月1日      
char buf[64]="";      
int len = sprintf(buf,"%d年%d月%d日",year,mon,day);      
printf("len = %d\n", len);      
printf("%s\n", buf);        
//需求：小明:18:男:北京海淀区      
char name[]="小明";      
int age = 18;      
char sex[]="男";      
char addr[] ="北京海淀区";       
char buf2[128]="";      
len = sprintf(buf2,"%s:%d:%s:%s",name,age,sex,addr);      
printf("len = %d\n", len);      
printf("%s\n", buf2);        
//上线：版本号:块编号:主机名：用户名：功能:附加消息        
//使用sprintf将数值 转成 字符串      
char buf3[16]="";      
sprintf(buf3,"%d",128);      
printf("buf3=%s\n", buf3);  }  

void test01()  
{      
char msg[]="2019年8月2日";      
int year = 0;      
int mon = 0;      
int day = 0;        
//%d只能提取'0'~'9'      
sscanf(msg,"%d年%d月%d日",&year,&mon,&day);      
printf("year = %d\n",year);      
printf("mon = %d\n",mon);      
printf("day = %d\n",day);        
//%c 提取一个字符  %f提取浮点数      
char ch=0;      
sscanf(msg,"%c年", &ch);      
printf("ch = %c\n", ch);        
//%s 提取一个字符串 遇到空格、回车、'\0'就会停止获取      
char str_year[32]="";      
char str_mon[32]="";      
char str_day[32]="";      
//char msg[]="2019年8月2日";      
sscanf(msg,"%s年%s月%s日", str_year, str_mon,str_day );      
printf("str_year =%s\n", str_year);//2019年8月2日      
printf("str_mon =%s\n", str_mon);      
printf("str_day =%s\n", str_day);  }