2019.10.9第二章课后做业4

第二章课后做业4 代码 #include <iostream> #include <cmath> using namespace std; int main() { int a,b; cout<<"请输入矩形的长a: "; cin>>a; cout<<"请输入矩形的宽b: "; cin>>b; int perimeter = (a+b)*2; int area = a*b; co

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