struct luruqichexinxi { char checi[3]; char shifaz[7]; char zhongdianz[7]; char leixing[7]; char zuoweishu[7]; char licheng[7]; char sjian[7]; char zjian[7]; char piaojia[7]; }b[40]; 假设 int a; a=400; 如何把a的值附给b[v].checi