Introduction to Programming
gkurbaji
ec2.pdf
C++ Quiz QUIZ 2 (Exam Credit)
March 2nd, 2015
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On My Honor – I did not receive any help or used any unauthorized materials during this quiz/exam.
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5 Points Extra Credit on Midterm Exam (Optional)
Program Trace Description
You are given the following program. There are no syntax errors, or logical errors in the program. Write an explanation of how each line the output of this program was produced by the program starting with each statement in main() and step by step (output trace).
This quiz is OPEN BOOK AND IS A TAKE HOME QUIZ (my advice is not to waste time trying to look up things in the book – it will not help.
Hints
Start from main() -‐ There are some very easy questions – start with them – separate the page for main, and the page for functions and workout the different function calls).
The void s(string ss) function is a gift – and it repeats throughout the program. Make sure you do all of them and understand what it does as it repeats. Get some points at least by following this function through if you are unable to do the others.
What I am looking for: You need to provide the output (you can easily get that by running the code through any compiler). But what you will get credit for, is a full explanation of how each line of main() ended up producing such a line or lines of output. In other words write how you traced each statement in main to the output it produces.
What do I turn in? As you work through the code, type your explanation of the program trace, and submit it with this sheet signed by 3/4/2015 by 11:59pm. No late submissions will be accepted.
You must include debugger screen shots of at least 5 statements showing the step by step value passing and changes in main and in the called functions. Your Blackboard submission means you signed the Honor statements above.
This is an Individual assignment that is part of the exam.
Copying or Sharing your code means you get a zero on both this quiz and the midterm.
Also, if you are absent from class on Wednesday, you will not get credit for the quiz. I will be taking attendance.
C++ Quiz QUIZ 2 (Exam Credit)
March 2nd, 2015
Name:
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Example: #include <iostream> #include <string>
using namespace std; void foo(int x, string a, string b) {
for (int i=0; i<x; i++)
cout<<a<<endl; cout<<"I printed "; cout<<x<<" times"+ b;
}
int main(){
foo(3, "Hello World...", "Thank you."); return 0;
}
Explanation: The call to foo foo(3, "Hello World...", "Thank you.") in main() passes an integer 3, and two strings to foo – a void function that takes one int parameter argument x and two string parameter agruments a and b. a copy of “Hello World…” is passed to a and a copy of (Thank you.) is passed to b – x takes on the value of 3 (x is a local variable of function foo).
Once in foo – it repeats a loop 3 times – only the first statement after the for loop header is taken because there are no braces. So, it prints a three times. And then it executes the other two statements printing I printed (the value of a) the value of x times and the value of b.
C++ Quiz QUIZ 2 (Exam Credit)
March 2nd, 2015
Name:
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#include <iostream> #include <string> using namespace std;
void s(string s){cout<<s<<endl;} //Watch for this function -‐ it is everywhere
void f1(int a, int b){ int x=0; if (a>b){x=a; a=b; b=x;} for (int i=a; i<b; i++) { cout << !a<<"\t"<<!!a<<"\t"<<i; cout<<endl;}
}
void f2(int b, int a) {f1(a,b);}
bool f3(){ const int max = 5; int a[max]; int q=5;
for (int i=0; i<q; i++){
if(i%2==0) a[i] = q+1; else a[i] = (q+2) *(-‐1);
} q-‐-‐; while (q){
if(a[q] > 0) cout<<!a[q]; else cout<<!!(a[q]-‐3*q); q-‐-‐;
} cout<<endl; return q;}
int f4(char ch) { return (ch>= 'A' && ch <='I') ? 1:0;}
int f5(int b, int a) { return (b -‐ a);}
int question_0(string ss){ s(ss); return 45/9.0;} void question_1(string ss){
s(ss); f1(5,7); f2(7,6);}
void question_2(string s) {cout<<s;}
void question_3(string ss){
s(ss); if (f3()) cout<< "Great!"; else cout<< "Terrific!"; cout <<"\n";}
void question_4(string ss){
s(ss); char c[]={'M','I','A','M','I'}; for(int i = 0; i<5; i++)
cout<< f4(c[i]); cout<<endl;}
int question_5(int a, int b, string ss) {s(ss); return a+b;} void question_6(string ss) { string tyc="\nThank you C++"; s(ss); cout<< tyc<<endl;}
C++ Quiz QUIZ 2 (Exam Credit)
March 2nd, 2015
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//Our main() int main() {
string ss="-‐-‐-‐";
cout<<question_0("q0\n")<<endl; s(ss); question_1("q1\n"); s(ss); question_2("q2\n"); s(ss); question_3("q3\n"); s(ss); question_4("q4\n"); s(ss); cout <<endl<<">>"<< question_5(f5(5,'b'-‐'a'),f5('a'-‐'b',5),"q5\n"); s(ss); question_6("q6\n"); s(ss);s("END"); s(ss); return 0;
}
C++ Quiz QUIZ 2 (Exam Credit)
March 2nd, 2015
Name:
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Extra WorkSheet
