#include
char *s = "`1234567890-=QWERTYUIOP[]\ASDFGHJKL;'ZXCVBNM,./";
int main()
{
int i, c;
while((c = getchar()) != EOF) {
for(i = 1; s[i] && s[i] != c; i ++);
if(s[i]) putchar(s[i-1]);
else putchar(c);
}
return 0;
}
for循环里的s[i] && s[i] != c该如何理解呢?