我遇到了一个问题 - 我需要使用一个宏的值作为字符串和整数。
#define RECORDS_PER_PAGE 10
/*... */
#define REQUEST_RECORDS \
"SELECT Fields FROM Table WHERE Conditions" \
" OFFSET %d * " #RECORDS_PER_PAGE \
" LIMIT " #RECORDS_PER_PAGE ";"
char result_buffer[RECORDS_PER_PAGE][MAX_RECORD_LEN];
/* ...and some more uses of RECORDS_PER_PAGE, elsewhere... */
这失败了
发布于 2018-02-07 14:01:38
下面xstr
定义的宏将在进行宏扩展之后进行串联。
#define xstr(a) str(a)
#define str(a) #a
#define RECORDS_PER_PAGE 10
#define REQUEST_RECORDS \
"SELECT Fields FROM Table WHERE Conditions" \
" OFFSET %d * " xstr(RECORDS_PER_PAGE) \
" LIMIT " xstr(RECORDS_PER_PAGE) ";"
https://stackoverflow.com/questions/-100003471
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