下面程序段运行时输出结果是：-4 #include < stdio.h> main() { int i,s; char s1[100]=" happy" ,s2[100]=" hello" ; i=0; while ((s1[i]==s2[i])& & (s1[i]!=' \0' )) i++; if ((s1[i]==' \0' )& & (s2[i]==' \0' )) s=0; else s=s1[i]-s2[i];

下面程序段运行时输出结果是：-4 #include < stdio.h> main() { int i,s; char s1[100]=" happy" ,s2[100]=" hello" ; i=0; while ((s1[i]==s2[i])& & (s1[i]!=' \0' )) i++; if ((s1[i]==' \0' )& & (s2[i]==' \0' )) s=0; else s=s1[i]-s2[i]; printf(" %d\n" ,s); }

?     正确

?     错误