一、问题及代码：
#include<iostream>
using namespace std;
int main()
{
int a,b,c;
cout<<"请输入身高a，体重b"<<endl;
cin>>a>>b;
c=a-100;
if(b>=c*1.2)
cout<<"超重"<<endl;
if(b<=c*0.8)
cout<<"超轻"<<endl;
else
cout<<"正常"<<endl;
return 0;
}
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
double x1,y1,x2,y2,a,b;
cout<<"请输入两点坐标(x1,y1),(x2,y2) "<<endl;
cin>>x1>>y1>>x2>>y2;
a=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
b=sqrt(a);
cout<<"距离="<<b<<endl;
return 0;
}
#include<iostream>
using namespace std;
int main()
{
cout<<"泰哥银行欢迎您"<<endl<<"请输入密码"<<endl;
int x,y;
cin>>x;
if(x=19980417)
cout<<"1.查询"<<endl<<"2.取款"<<endl<<"3.存款"<<endl<<"4.转账"<<endl<<"0.退出"<<endl;
cin>>y;
cout<<"谢谢，您选择了"<<y<<"号功能"<<endl;
return 0;
}
二、运行结果：
三、心得体会：应用了if语句的嵌套。
四、知识点总结：if及else运用。
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