Exercises
Question 1: Which of the following words can be used as variable names?
1x11, x11, xx12, _abc, name_variable, for, if, for1, 1while.
Answer: x11, xx12, abc, name_variable, for1 can be used for names of variables.
Question 2. What are the outputs of the following program?
#include<iostream.h>
void main()
Answer: 1 1 1 2 1 3
{
212223
int i, j;
313233
for (i=1; i<5; i++)
414243
{
515253
for(j=1; j<=3; j++)
cout<<i<<j;
cout<“\n”;
}
}
Page 1
5/29/2016
CS3369 Real Time Control
Software/DENG Xiaotie
Question 3. What are the outputs of the
following program?
Question 4. What are the outputs of the
following program?
#include<iostream.h>
#include<iostream.h>
void main()
void main()
{
{
int i = 10;
int i, j;
for (i=1; i<=5; i++)
if(i<0) cout <<“negative”;
{
if (i>100) cout<<“too large”;
for (j=1; j<=i; j++)
if (i>=75 && i<=100)
cout<<“ ”; /* There is one space*/
cout<<“excellent”;
cout <<“**** \n”;
}
}
}
What if the initial value is 88?
Answer of Q4: ****
Answer of Q3: Nothing is output.
If the initial value of I is 88, the output
is :
****
****
****
excellent
****
5/29/2016
CS3369 Real Time Control
Software/DENG Xiaotie
Page 2
Question 5. What are the outputs of the
following program?
Question 6. What are the outputs of the
following program?
#include<iostream.h>
#include<iostream.h>
void main()
int max (int x, int y);
{
void main()
int i;
{
int x1=100, x2=102, x3=99;
i=1;
int temp_max, temp_max1;
while(i<=5)
temp_max=max(x1,x2);
{
temp_max1=max(temp_max, x3);
cout<<i;
cout<<“The maximum is”;
i=i+1;
cout << temp_max1;
}
}
}
int max (int x, int y)
{ int temp=x;
Answer of Q5: 1 2 3 4 5
if (y>temp) temp=y;
return temp;
}
5/29/2016
CS3369 Real Time Control
Answer: The maximum is 102.
Software/DENG Xiaotie
Page 3
Question 7. What are the outputs of the
following program?
#include<iostream.h>
int max (int x, int y, int z);
void main()
{
Question 8. What are the outputs of the following program?
#include<iostream.h>
int max (int x, int y, int z);
void main()
{
int x1=100, x2=102, x3=99;
temp_max=max(99, 102, 166);
int temp_max;
cout<<“The maximum is”;
temp_max=max(x1,x2,x3);
cout<<“The maximum is”;
cout << temp_max;
}
cout << temp_max;
}
int max (int x, int y, int z)
{
int max (int x, int y, int z)
{
if (y>temp) temp=y;
if (y>temp) temp=y;
if(z>temp) temp=z;
if(z>temp) temp=z;
}
5/29/2016
Answer: The maximum is 102
int temp=x;
cout<<“The input numbers are”<<x<<y<<z<<“\n”;
int temp=x;
return temp;
int temp_max;
return temp;
}
Answer: The input numbers are 99 102 166
CS3369 Real Time
TheControl
maximum is 166
Software/DENG Xiaotie
Page 4
Question 9. What are the
outputs of the following
program?
#include<iostream.h>
int computation(int x);
void main()
{ int z, w, w1,x=10;
/* x he is a variable that can
be used in main() */
z=computation(5);
w=computation(z);
w1=computation(x);
cout<<z<<w<<w1
}
5/29/2016
int computation(int x)
/*x here is a formal
parameter */
{ int y;
y=x*x+25;
cout<<“input
is”<<x<<“\n”;
return y;
}
Answer: input is 5
CS3369 Real Time Control
Software/DENG Xiaotie
input is 50
input is 10
50 2525 125
Page 5
Question 10. What are the outputs
of the following program?
int max ()
{ int temp=x;
#include<iostream.h>
cout<<“The input numbers are”;
int x, int y, int z;
cout <<x<<y<<z<<“\n”;
int max ();
if (y>temp) temp=y;
void main()
{
if(z>temp) temp=z;
int temp_max;
x=90;
y=91;
z=z+1;
z=92;
return temp;
cout<<z<<“\n”;
temp_max=max();
}
cout<<“The maximum is”;
cout << temp_max <<“\n”;
Answer: 92
The input numbers are 90 91 92
cout<<z;
The maximum is 92
}
5/29/2016
CS3369 Real Time Control 93
Software/DENG Xiaotie
Page 6
Question 11. (Moderate) Write a function that takes three
integers as its input parameters and outputs the smallest number
among the three integers. The prototype of the function is as
follows:
#include<iostream.h>
int min (int x, int y, int z);
cout<<“Please enter an integer in the ranges [0, 100] or
[200,300]\n”;
Answer: int min (int x, int y, int z)
void main()
{ int n;
cin>>n;
{
int temp =x;
while (n<0|| n>100&&n<200 ||n>300)
if (y<temp) temp =y;
{
cout<<“Please enter an integer in the ranges [0,
100] or [200,300]\n”;
if (z<temp) temp=z;
return temp;
cin>>n;
}
Question 12. (Hard) Write a program that (1) asks the user to
input an integer from the screen, (2) the input integer should be
in the range [0, 100] or [200, 300], and (3) if the input integer is
not in the required ranges, ask the user to re-enter the integer
until the integer is in the required ranges.
}
}
Page 7
5/29/2016
CS3369 Real Time Control
Software/DENG Xiaotie