1 #include <stdio.h>
 2 
 3 #define dprint( expr ) printf( "%s = %d \n", #expr , expr)
 4 
 5 int main(void)
 6 {
 7     int x = 100;
 8     int y = 2;
 9     
10      dprint(x/y);
11     dprint( x+y );
12     dprint( x+y+2 );
13     return 0;
14 }

打印信息：

*******************************************************

x/y = 50
x+y = 102
x+y+2 = 104

*******************************************************