TE-241 COMPUTER PROGRAMMING
Second Midterm Examination
Lecturer: Dr. Ahmet ERKLİĞ
Date
: 02-01-2009
Student Name:
Duration: 90 mins.
Q1. (25%) What is the output of the following FORTRAN programs?
PROGRAM Q1A
REAL:: X, Y
OPEN(UNIT=1,FILE='EXAM.DAT', STATUS='NEW')
WRITE(UNIT=1, FMT='(I2,F5.2,I2)') 41,&
8.316, 26
CLOSE(UNIT=1)
PROGRAM Q1B
INTEGER::I, Y
I = 1
CALL X(I)
PRINT *, Y(I)
END PROGRAM Q1B
OPEN(UNIT=2,FILE='EXAM.DAT', STATUS='OLD')
READ(UNIT=2, FMT=*) X, Y
PRINT '(1X,F7.3)', X + Y
CLOSE(UNIT=2)
END PROGRAM Q1A
SUBROUTINE X(J)
INTEGER::J, Y
J = Y(4) + Y(J)
CALL Z(J)
END SUBROUTINE X
INTEGER FUNCTION Y(K)
INTEGER:: K
Y = K - 1
END FUNCTION Y
SUBROUTINE Z(I)
INTEGER::I, J
J = 2
I = I + J
END SUBROUTINE Z
Q2. (25%) Write a function named SUM_FROM_TO that takes two integer arguments, called
FIRST and LAST and returns as its value the sum of all the integers between FIRST and
LAST inclusive. Thus, for example,
PRINT*, SUM_FROM_TO(4,7)
PRINT*, SUM_FROM_TO(-3,1)
PRINT*, SUM_FROM_TO(7,4)
PRINT*, SUM_FROM_TO(9,9)
!
!
!
!
!
!
!
will print 22 because
4+5+6+7 = 22
will print -5 because
(-3)+(-2)+(-1)+0+1 = -5
will print 22 because
7+6+5+4 = 22
will print 9
Note that, as the third example shows, the arguments to the function are not necessarily in
ascending order. Also, as in example 4, the arguments to the function maybe equal.
Q3. (25%) Write a subroutine Bankamatik(Euros) that performs the following task:
A request for money from a cash dispenser (bankamatik) is passed to the subroutine via the
argument Euros. The subroutine calculates and then outputs the number of one, five, ten, and
twenty Euro coins/notes such that the least number of coins/notes are given.
For example, if argument Euros = 37, then the result of the subroutine is the output:
The number of twenties is 1
The number of tens is 1
The number of fives is 1
The number of ones is 2
What is the output of your subroutine for: Euros = 127 ?
Q4. (25%) Write a FORTRAN program that can read (10 x 10) matrix from an input file and
calculate the average of all the data in each row and in each column of the matrix.
INTEGER FUNCTION SUM_FROM_TO(FIRST, LAST)
INTEGER FIRST, LAST, I
SUM_FROM_TO = 0
IF (FIRST .LT. LAST) THEN
DO I = FIRST, LAST
SUM_FROM_TO = SUM_FROM_TO + I
ENDDO
ELSE IF (FIRST .GT. LAST) THEN
DO I = FIRST, LAST, -1
SUM_FROM_TO = SUM_FROM_TO + I
ENDDO
ELSE
SUM_FROM_TO = FIRST
ENDIF