目录
new运算符
new运算符会在堆上申请一段内存空间,一般的变量是在栈上的。
new出来的变量只要不delete释放,在其他函数等任意位置都可以使用,
new会返回这段内存空间的首地址。
new并不确保会自动初始化
测试
- 这里我们使用vs2019运行测试
- 待测试的一共有4种变量申请方法:
- 全局区new - 图中global_new_int
- 全局区声明 - 图中global_int
- 函数内new - 图中fun_new_int
- 函数内声明 - 图中fun_int
- 直接运行是过不了vs2019的编译的
- 提示fun_int没有进行初始化就被使用
- 因此 函数内声明的变量 就显然是需要自己手动初始化的,编译器不会帮我们。
- 接下来给fun_int手动初始化,改为int fun_int = 123;
- 运行结果
- 全局区new - 不会自动初始化
- 全局区声明 - 会自动初始化为0
- 函数内new - 不会自动初始化
- 函数内声明 - 不会自动初始化,而且不手动初始化的话连编译都过不了
结论
- 可见new的不管是在全局区还是函数内都不会自动初始化。
- 而在全局区直接定义变量是会自动初始化的。
- 自己习惯手动初始化才是最保险的。
canadian online pharmacy precription drugs from canada canadian pharmacy 24
http://indiaph24.store/# online pharmacy india
canadian pharmacy online store trustworthy canadian pharmacy online canadian pharmacy
http://indiaph24.store/# best india pharmacy
mexican pharmacy mexico pharmacy mexican pharmaceuticals online
https://indiaph24.store/# india pharmacy mail order
mexico pharmacies prescription drugs: cheapest mexico drugs – medicine in mexico pharmacies
https://mexicoph24.life/# mexican pharmacy
mexico drug stores pharmacies mexico pharmacies prescription drugs buying prescription drugs in mexico online
http://indiaph24.store/# reputable indian online pharmacy
best online pharmacy india buy medicines from India indian pharmacy
http://indiaph24.store/# top online pharmacy india
http://indiaph24.store/# best online pharmacy india
reputable canadian pharmacy Licensed Canadian Pharmacy buying from canadian pharmacies
http://mexicoph24.life/# buying prescription drugs in mexico
http://mexicoph24.life/# mexican border pharmacies shipping to usa
pharmacies in mexico that ship to usa Mexican Pharmacy Online medication from mexico pharmacy
cheapest online pharmacy india: Generic Medicine India to USA – pharmacy website india
https://mexicoph24.life/# best online pharmacies in mexico
top 10 pharmacies in india indian pharmacy indian pharmacy paypal
http://mexicoph24.life/# mexican pharmacy
http://canadaph24.pro/# canadadrugpharmacy com
mexico drug stores pharmacies mexico pharmacy mexico drug stores pharmacies
http://canadaph24.pro/# buying drugs from canada
canadapharmacyonline legit canadian pharmacy com canadian pharmacy 1 internet online drugstore
ordering drugs from canada: Prescription Drugs from Canada – pharmacy in canada
canadianpharmacyworld Prescription Drugs from Canada legal to buy prescription drugs from canada
https://canadaph24.pro/# cross border pharmacy canada
https://canadaph24.pro/# best canadian online pharmacy
mail order pharmacy india mail order pharmacy india mail order pharmacy india
https://indiaph24.store/# india pharmacy mail order
https://canadaph24.pro/# canadian pharmacy no scripts
best online pharmacies in mexico mexico pharmacy medicine in mexico pharmacies
http://mexicoph24.life/# mexican online pharmacies prescription drugs
canadian online drugstore canadian pharmacies buying drugs from canada
indian pharmacy paypal: indian pharmacy – india pharmacy
https://indiaph24.store/# Online medicine home delivery
http://canadaph24.pro/# canadian pharmacy world reviews
canadian online pharmacy Prescription Drugs from Canada best online canadian pharmacy
http://indiaph24.store/# buy medicines online in india
onlinecanadianpharmacy Prescription Drugs from Canada global pharmacy canada
http://canadaph24.pro/# best canadian pharmacy online
top 10 pharmacies in india indian pharmacy fast delivery cheapest online pharmacy india
http://canadaph24.pro/# canadian pharmacy online ship to usa
https://canadaph24.pro/# canadian online pharmacy reviews
best canadian online pharmacy Certified Canadian Pharmacies reputable canadian online pharmacy
http://canadaph24.pro/# canadian pharmacy ratings
northwest pharmacy canada Licensed Canadian Pharmacy canadianpharmacy com
https://mexicoph24.life/# mexico pharmacies prescription drugs
http://indiaph24.store/# top online pharmacy india