函数名: lrotl, _lrotl 
 功  能: 将无符号长整型数向左循环移位 
 用  法: #include <stdlib.h> 
         unsigned long lrotl(unsigned long lvalue, int count); 
         unsigned long _lrotl(unsigned long lvalue, int count); 
 程序例: 
/* lrotl example */ 
 #include <stdlib.h> 
 #include <stdio.h> 
int main(void) 
 { 
    unsigned long result; 
    unsigned long value = 100; 
   result = _lrotl(value,1); 
    printf("The value %lu rotated left one bit is: %lu\n", value, result); 
   return 0; 
 }