#include"stdio.h"main( ){int a,b;l1:for(a=0;a<=8;a++){if a+b>8 goto l2;}l2:for(b=0;b<=7;b++){if b+a>7 goto l1;}{if(48.7*a+52*b<1020&&2*a+3*b&&2040-48.7*(a+b)-52*b==0)printf("%d,%d ",a,b);}}针对indentifier'a' indentifier'b'怎么改.谢谢