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for(;ram_address_back <= Ram_address; ram_address_back++) { if(*ram_address_back==0x00000000) { *ram_address_back =0x55555555; back=*ram_address_back; back=0x00000000; } else {RAM_check_flag=FALSE;break; } } 按步运行仿真back=*ram_address_back这个语句不运行,直接运行back=0x00000000;但我如果去掉back=0x00000000这条语句的话back=*ram_address_back;可以运行