# include & ltstdio.h & gt
# include & ltstring.h & gt
void strcatyy(字符目標[20],字符源[20])
{
char *t,* s;
t=destination+strlen(目的地);
s =來源;
for(;*s!='\0';t++,s++)
* t = * s;
* t = ' \ 0
}
void main()
{
char a[20],b[20];
scanf("%s ",a);scanf("%s ",b);
strcatyy(a,b);
看跌期權(a);
}