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Midterm Exam Answers

Introduction to Scientiﬁc Computing with C++

Name: 30 June 2011

• Answer TEN of the following ELEVEN Questions. Cross out the num-

ber of the question you wish to omit.

• During this exam, you are allowed to refer to notes you have made,

on two sheets of paper. No other references are allowed.

• I am not asking you to write complete C++ programs! However, when

you write your C++ statements, you should include the necessary dec-

larations and initializations.

• If I ask you to write a C++ function, I want a complete function,

including the function header, curly brackets, and returned value.

1. Write a for loop which prints the integers from 100 down to 0 by

ﬁves; that is, the ﬁrst three lines should be 100, 95, 90...

int i;

for ( i = 100; 0 <= i; i = i - 5 )

{

cout << i << "";

}

2. A user is going to input several integers to a program, terminating

with an extra, dummy value of 999. Write C++ code which reads the user’s

data and computes the sum, while ignoring the ﬁnal 999 value.

int i, sum = 0;

while ( true )

{

cin >> i;

if ( i == 999 )

{

break;

1

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