Answer: The following code is in c++ 
#include <iostream>
#include<math.h>
using namespace std;
int main()
{
    float a,b,c;
    cout<<"Enter height and base of triangle\n";
    cin>>a>>b;  //reading two sides from user
    c=sqrt(pow(a,2)+pow(b,2));  //calculating hypotenuse
    cout<<"Length of hypotenuse is "<<c;  //printing third side of triangle
    return 0;
}
OUTPUT :
Enter height and base of triangle                                                                                             
3                                                                                                                              
4                                                                                                                              
Length of hypotenuse is 5   
Explanation:
In the above code, three variables a, b and c of int type are declared. After that, it is asked from user to enter the value of a and b. The user puts the value and then c is calculated with the help of Pythagoras theorem formulae which squares the values of two sides and then adds them to calculate hypotenuse of a right angled triangle and finally c is printed to console.
 
        
             
        
        
        
Have a look at the man page for printf:
man 3 printf
        
                    
             
        
        
        
Answer:
Explanation:
This is unsolvable if you have no variable substitutes
 
        
             
        
        
        
Answer:
The given statement is "False".
Explanation:
Mainframes computer are also known big iron computer basically Mainframe computer is used by the big organization when the organization needs to work in the high-level project. The mainframe has big data processing. It is highly used in critical applications such as ERP(Enterprise resource planning).
A mainframe computer is not a flexible computer also they are not potable .microcomputers, are more flexible computers we can easily work on the microcomputers.
So the given statement is False.