/* test.c */
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main ()
{
char *src = "hello,My girlfriend";
int len = strlen(src);
char *dest = (char *)malloc(len);
char *d = dest;
char *s = src[len];
while(len--!=0) //應將 = 改爲 :==
{
d++=s--;
}
printf("%s",dest);
return 0;
}
[Error] lvalue required as left operand of assignment
原因:
計算值爲== !=
變量爲=
賦值語句的左邊應該是變量,不能是表達式。而實際上,這裏是一個比較表達式,所以要把賦值號(=)改用關係運算符(==)