菜鸟求助，这个程序有什么问题？
#include<stdio.h>void main ()
{
char c1='a',c2='b',c3='c',c4='\\101',c5='\\106';printf ("a%c%b\\tc%c\\tabc\\n",c1,c2,c3);
printf ("\\t\\b%c %c\\n",c4,c5);
}
D:\c\aa_a1.c(4) : warning C4305: 'initializing' : truncation from 'const int ' to 'char '
D:\c\aa_a1.c(4) : warning C4305: 'initializing' : truncation from 'const int ' to 'char '
aa_a1.obj - 0 error(s), 2 warning(s)
