这个怎么敲，一直想不出来。初学者太难了

double c;
。。。cin>>a>>b;
c = a * b;
cout<<c

#include <stdio.h>
int main()
{
    float w, h;
    scanf("%f %f", &w, &h);
    printf("width is : %f, heigth is : %f\n", w, h);
    printf("arae is : %f\n", w * h);
    return 0;
}