下面程序main(){char a[]="ABCDEFG", k, *p;fun(a, 0, 2); fun(a, 4, 6);printf("%s\n", a);}fun(char *s, int p1, int p2){char c;while(p1A.ABCDEFG
B.DEFGABC
C.GFEDCBA
D.CBADGFE