CPP Sol Week04

8/21/2019 CPP Sol Week04

1/20

A ril 2015

()

FunctionsValue-Returning

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C++ Programming

Week 4

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. ائ اار اث


2/20

A ril 2015

(2)

Functions (Introduction )

Write a program that reads 2 integers and prints the sum of integers in

between inclusively (without using functions).

# include

using namespace std;

int main ( )

{int x, y, i, min, max, sum = 0;

cout > x >> y;

if (x < y)

{ min = x; max = y; }

else

{ min = y; max = x; }

for (i = min ; i


3/20

A ril 2015

(3)

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اا ةئا ا

أ (x, y)اء س اء (s)(sum)(main)

Functions (Introduction )

Write a program that reads 2 integers and calls a function that gets these

two integers and returns the sum of integers in between.

The main function should print the result.

# include using namespace std;

int fun (int, int);

int main ( )

{

int x, y, sum;

cout > x >> y;

sum = fun (x, y);

cout


4/20

A ril 2015

(4)

Functions (Power )

Write a program that reads two positive integers, and call a function that

returns the power of the first integer raised to the second integer.

Note: you are not allowed to use library functions.

# include


int power (int, int);

int main ( )

{

int x, y, p;

cout > x >> y;

p = power (x , y);

cout


5/20

A ril 2015

(5)

ج اط

Functions (Middle)

Write a program that reads three integers and calls a function to find their

middle. The main function will print the result.

# include


int middle (int, int, int);

int main ( )

{

int x, y, z, mid;

cout > x >> y >> z;

mid = middle (x, y, z);

cout


6/20

A ril 2015

(6)

Functions (Even

or odd? )

Write a program that reads an integer and calls a function that indicates if

the integer is even or odd, the main function will print the result.

# include


bool Is_Odd (int);

int main ( )

{

int x; bool y;

cout > x;

y = Is_Odd (x);

if (y == true)

cout


7/20

A ril 2015

(7)

factorial

Functions (Factorial )

Write a program that reads a positive integer and calls a function that

calculates its factorial. The main function will print the result.


int fact (int x)

{ int i, f = 1;

for (i = 1; i x;

if (x < 0)

cout


8/20

A ril 2015

(8)

)ign S - Reverse unctions (F

Write a program that reads a number and calls a function that reverses the

sign of the number received according to the following sample outputs. The

main function will print the result.

# include


double reverse (double x)

{

return x * -1;

}

int main ( )

{double x;

cout > x;

if (x == 0)

cout


9/20

A ril 2015

(9)

ة

Functions (Perfect )


checks if it is perfect or not. The main function will print the result.

# include


bool perfect (int);

int main ( )

{

int x;

bool y;

cout > x;

y = perfect (x);

if (y == true)

cout


10/20

A ril 2015

(1)

أ ا ر

Functions (Prime)


checks if it is prime or not. The main function will print the result.


bool prime (int);

int main ( )

{

int x;

cout > x;

if (x


11/20

A ril 2015

()

Functions (Sum x-to-y )

Write a function that gets three integers and returns the sum of all integers

between the first two integers that are divisible by the third one inclusively.

If the integers are: 14 3 5 , the function should return 15 If the integers are: 15 21 7 , the function should return 21

If the integers are: 12 21 11 , the function should return 0

int divisible (int x, int y, int z)

{

int i, min, max, sum = 0;

if (x < y)

{ min = x; max = y; }

else

{ min = y; max = x; }

for (i = min; i


12/20

A ril 2015

(2)

Functions (Contains

odd? )

Write a function that gets an integer and returns true if any of its digits is

odd.

If the integer is 1236, the function will return true .If the integer is 284 , the function will return false .

bool digits (int x)

{

int d;

while (x != 0)

{d = x % 10;

if (d % 2 != 0)

return true;

x /= 10;}

return false;

}

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: اخر اخ او

{

if (x % 2 != 0)

return true;

x /= 10;}


13/20

A ril 2015

(3)

Functions (Average of even digits )

Write a function that gets a positive integer and returns the average of the

even digits it contains.

If the integer is 284, the function will return 4.66667 If the integer is 1236, the function will return 4

double digits (int x)

{

int i, d, count = 0, sum = 0;

while (x != 0)

{d = x % 10;

if (d % 2 == 0)

{

sum += d;

count ++;

}

x /= 10;

}

if (count == 0)

return 0;

return sum * 1.0 / count;

}

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ا

إ

.


14/20

A ril 2015

(4)

Functions (M ir ror of on integer )

Write a function that gets a positive integer and returns its mirror.

If the integer is 1236, the function will return 6321 If the integer is 284, the function will return 482

int mirror (int x)

{

int d, m = 0;

while (x != 0)

{

d = x % 10;

m = m * 10 + d;

x /= 10;

}

return m;

}

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ر ض اذإ(10)زأ .خ ار خ إ ار

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ا ف ل.


15/20

A ril 2015

(5)

Functions (gcd )

Write a function that gets two positive integers and returns their greatest

common divisor.

If the integers are: 12 36 , the function will return 12 If the integers are: 24 18, the function will return 6

If the integers are: 15 7, the function will return 1

int gcd (int x, int y)

{

int i, min;

if (x < y)

min = x;

else

min = y;

for (i = min; i >= 1; i--)

if (x % i == 0 && y % i == 0)

return i;

}

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أ

.

ا كا ا ان

أ

اق ن.

ا ك اذإ اا د(1.)


16/20

A ril 2015

(6)

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ة أloopخاد ةـاloop.}(2){

Exercise: An application of function floor is rounding a value to the nearest

integer, The statement

y = floor ( x + 0.5 );

rounds the number x to the nearest integer and assigns the result to y.

Write a program that reads several numbers and uses the preceding

statement to round each of these numbers to the nearest integer.(Hint: use functions).

# include

# include


int main ( ){

double x, y;

cout > x;

while ( x != -1 )

{ y = floor ( x + 0.5 );

cout


17/20

A ril 2015

(7)

Exercise: Define a function hypotenuse that calculates the length of the

hypotenuse of a right triangle when the other two sides are given.

Use this function in a program to determine the length of the hypotenuse for

each of the triangles below:

side1 = 3.0 side2 = 4.0

side1 = 5.0 side2 = 12.0side1 = 8.0 side2 = 15.0

# include

# include

# include


double hyp ( double, double );

int main ( )

{

cout


18/20

A ril 2015

(8)

Exercise: Write a function that takes a number and a character, and prints

a solid square of that character with side equal to the number. For example,

if 4 and # are read, the following square is printed.

####

####

########

# include


void square ( int, char );

int main ( )

{

int size;

char c;

cout > size;

cout > c;

square ( size, c );

return 0;

}

void square ( int size, char c )

{for ( int i = 1; i


19/20

A ril 2015

(9)

Exercise: Write a program that inputs three double numbers and passes

them to a function that returns the smallest number.

# include


double smallest ( double, double, double );

int main ( )

{

double x, y, z, min;

cout > x >> y >> z;

min = smallest ( x, y, z );

cout


20/20

A ril 2015

(21)

Exercise: Write a function distance that calculates the distance between two

points (x1, y1) and (x2, y2). All numbers and return values are of type

double.

# include # include

# include


double distance ( double, double, double, double );

int main ( )

{

double x1, x2, y1, y2, d;

cout > x1 >> y1;

cout > x2 >> y2;

d = distance (x1, y1, x2, y2 );

cout

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