1. CS3369 Real Time Control Software/DENG Xiaotie
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() {
int i, j;
for (i=1; i<5; i++)
for(j=1; j<=3; j++)
cout<<i<<j;
cout<“\n”; }
Answer:
5/1/2019
CS3369 Real Time Control Software/DENG Xiaotie

2. CS3369 Real Time Control Software/DENG Xiaotie
Question 3. What are the outputs of the following program?
#include<iostream.h>
void main() {
int i = 10;
if(i<0) cout <<“negative”;
if (i>100) cout<<“too large”;
if (i>=75 && i<=100)
cout<<“excellent”; }
What if the initial value is 88?
Answer of Q3: Nothing is output.
If the initial value of I is 88, the output is :
excellent
Question 4. What are the outputs of the following program?
#include<iostream.h>
void main()
{ int i, j;
for (i=1; i<=5; i++) {
for (j=1; j<=i; j++)
cout<<“ ”; /* There is one space*/
cout <<“**** \n”; }
Answer of Q4: ****
****
5/1/2019
CS3369 Real Time Control Software/DENG Xiaotie

3. CS3369 Real Time Control Software/DENG Xiaotie
Question 5. What are the outputs of the following program?
#include<iostream.h>
void main() {
int i;
i=1;
while(i<=5)
cout<<i;
i=i+1; }
Answer of Q5:
Question 6. What are the outputs of the following program?
#include<iostream.h>
int max (int x, int y);
void main()
{ int x1=100, x2=102, x3=99;
int temp_max, temp_max1;
temp_max=max(x1,x2);
temp_max1=max(temp_max, x3);
cout<<“The maximum is”;
cout << temp_max1; }
int max (int x, int y)
{ int temp=x;
if (y>temp) temp=y;
return temp;
Answer: The maximum is 102.
5/1/2019
CS3369 Real Time Control Software/DENG Xiaotie

4. CS3369 Real Time Control Software/DENG Xiaotie
Question 7. 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;
int temp_max;
temp_max=max(x1,x2,x3);
cout<<“The maximum is”;
cout << temp_max; }
int max (int x, int y, int z)
{ int temp=x;
if (y>temp) temp=y;
if(z>temp) temp=z;
return temp;
Answer: The maximum is 102
Question 8. What are the outputs of the following program?
#include<iostream.h>
int max (int x, int y, int z);
void main()
{ int temp_max;
temp_max=max(99, 102, 166);
cout<<“The maximum is”;
cout << temp_max; }
int max (int x, int y, int z)
{ int temp=x;
cout<<“The input numbers are”<<x<<y<<z<<“\n”;
if (y>temp) temp=y;
if(z>temp) temp=z;
return temp;
Answer: The input numbers are
The maximum is 166
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CS3369 Real Time Control Software/DENG Xiaotie

5. CS3369 Real Time Control Software/DENG Xiaotie
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 }
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
input is 50
input is 10
5/1/2019
CS3369 Real Time Control Software/DENG Xiaotie

6. CS3369 Real Time Control Software/DENG Xiaotie
Question 10. What are the outputs of the following program?
#include<iostream.h>
int x, int y, int z;
int max ();
void main()
{ int temp_max;
x=90; y=91; z=92;
cout<<z<<“\n”;
temp_max=max();
cout<<“The maximum is”;
cout << temp_max <<“\n”;
cout<<z; }
int max ()
{ int temp=x;
cout<<“The input numbers are”;
cout <<x<<y<<z<<“\n”;
if (y>temp) temp=y;
if(z>temp) temp=z;
z=z+1;
return temp; }
Answer: 92
The input numbers are
The maximum is 92 93
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CS3369 Real Time Control Software/DENG Xiaotie

7. CS3369 Real Time Control Software/DENG Xiaotie
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:
int min (int x, int y, int z);
Answer: int min (int x, int y, int z) {
int temp =x;
if (y<temp) temp =y;
if (z<temp) temp=z;
return temp; }
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.
#include<iostream.h>
void main()
{ int n;
cout<<“Please enter an integer in the ranges [0, 100] or [200,300]\n”;
cin>>n;
while (n<0|| n>100&&n<200 ||n>300) { }
5/1/2019
CS3369 Real Time Control Software/DENG Xiaotie