here we just want to divide a simple string with blank space within it , such as " hello world " .
char buff[256]=" hello world ";
and we have two general well-programmed source solution :
soluation 1 :
while( i < 256 && buff[i++] == ‘ ‘ );
we use the above code to skip the head blank space on hello .
but it rush to i=2 ! but we just have a single blank space on hello .
and here we have a normal solution :
while( i<256 && buff[i]==‘ ‘ )i++;
in this way , we get the first NOT blank i=1;
in face , when we use the first ways , i=0 , it satisfy the loop condition , and i=1;
when i=1 , it can not satisfy the condition , but i will increment itself automatically !!!
be careful !
while(i<256&&buff[i]==' ')i++; VS while(i<256 && buff[i++]==' ');
原文：http://www.cnblogs.com/dragen/p/4113035.html