LAB 2 Solutions

1.cpp

#include <iostream>

using namespace std;

float Add(float a, float b, float c){
  return a+b+c;
}

int main() {
  float a, b, c;
  cout << "Enter three numbers: ";
    cin >> a >> b >> c;
  cout << "The sum of " << a << ", " << b << " and " << c " is " << Add(a,b,c);
  return 0;
}

10.cpp

#include <iostream>

using namespace std;

float AreaOfCircle(float radius, float PI = 3.14){
  return PI*radius*radius;
}

int main() {
  float rad, PI;
  cout << "Enter the radius of a circle: ";
  cin >> rad;
  cout << "Using default value, area of circle is: " << AreaOfCircle(rad) << endl;
  cout << "Enter the value of PI to be used: ";
  cin >> PI;
  cout << "Using your value of PI, area of circle is: " << AreaOfCircle(rad, PI) << endl;
  return 0;
}

11.cpp

#include <iostream>

using namespace std;

void displayEvenNumbers(int n1, int n2 = 1000){
  if(n2 < n1){
    cout << "n1 should be smaller than n2";
  }
  for(int i=n1; i<n2; i++){
    if(i %2==0){
      cout << i << " ";
    }
  }
}

int main() {
  int n1, n2;
  cout << "Enter the limits: ";
  cin >> n1 >> n2;
  cout << "Even numbers from " << n1 << " to " << n2 << " are: " << endl;
  displayEvenNumbers(n1, n2);
  cout << endl;
  cout << "Using default value of n2=1000: " << endl;
  displayEvenNumbers(n1);
  return 0;
}

12.cpp

#include <iostream>

using namespace std;

int Increase(int num, int n = 10){
  return num + n;
}

int main() {
  int num, n;
  cout << "Enter the value of num: ";
  cin >> num;
  cout << "Using default value of n=10, Increase(num) = " << Increase(num) << endl;
  cout << "Enter the value of n: ";
  cin >> n;
  cout << "Using the given value of n, Increase(num, n) = " << Increase(num, n) << endl;
  return 0;
}

2.cpp

#include <iostream>

using namespace std;

void ReadData(float *a, float *b, float *c){
  cout << "Enter three numbers: ";
    cin >> *a >> *b >> *c;
}

float AddData(float a, float b, float c){
  return a+b+c;
}

void DisplayData(float result){
  cout << "The sum is: " << result << endl;
}

int main() {
  float a, b, c;
  ReadData(&a, &b, &c);
  float sum = AddData(a, b, c);
  DisplayData(sum);
  return 0;
}

3.cpp

#include <iostream>

using namespace std;

long factorial(int x){
  return x == 0 ? 1 : x*factorial(x-1);
}

long permutation(int n, int r){
  return factorial(n) / factorial(n-r);
}

int main() {

  int n, r;
  cout << "Enter values of n and r: ";
    cin >> n >> r;
  long perm = permutation(n,r);
  cout << "P(" << n << "," << r << ") = " << perm << endl;
  return 0;
}

4.cpp

#include <iostream>
#include <cmath>

using namespace std;

float power(float m, int n){
  return pow(m, n);
}

int main() {

  float m;
  int n;
  cout << "Enter values of m and n: ";
    cin >> m >> n;
  float p = power(m,n);
  cout << m << "^" << n << " = " << p << endl;
  return 0;
}

5.cpp

#include <iostream>
#define ASCII_a 97
#define ASCII_z 122
#define ASCII_A 65
#define ASCII_Z 90

using namespace std;

void upperOrLower(char *c){
  if(*c >= ASCII_a && *c <= ASCII_z){
    *c -= 32;
  }
  else if(*c >= ASCII_A && *c <= ASCII_Z){
    *c += 32;
  }
}

int main() {

  char c = '0';
  cout << "Enter a character: ";
    cin >> c;
  upperOrLower(&c);
  cout << "Result = " << c << endl;
  return 0;
}

6.cpp

#include <iostream>

using namespace std;

void TempConversion(float *tempr){
  *tempr =  1.8 * (*tempr) + 32;
}

int main() {
  float tempC;
  cout << "Enter temperature in Celcius: ";
    cin >> tempC;
  TempConversion(&tempC);
  cout << "Temperature in Fahrenheit= " << tempC << endl;
  return 0;
}

7.cpp

#include <iostream>

using namespace std;

//area of triangle
float area(float b, float h){
  return 0.5*b*h;
}

//area of square
float area(float a){
  return a*a;
}

int main() {
  float a, b, h;
  cout << "Enter base and height of triangle: ";
  cin >> b >> h;
  cout << "Area of triangle= " << area(b, h) << endl;
  cout << "Enter side of the square: ";
  cin >> a;
  cout << "Area of square= " << area(a);
  return 0;
}

8.cpp

#include <iostream>

using namespace std;

float Average(float a, float b){
  cout << "Average() function with float parameters called." << endl;
  return (a+b)/2.0;;
}

float Average(int a, int b){
  cout << "Average() function with int parameters called." << endl;
  return (a+b)/2.0;
}

int main() {
  float a, b, avgWeight;
  cout << "Enter the weights of two students: ";
  cin >> a >> b;
  avgWeight = Average(a, b);
  cout << "Average weight = " << avgWeight << endl;
  int x, y;
  float avgAge;
  cout << "Enter the ages of two students: ";
  cin >> x >> y;
  avgAge = Average(x, y);
  cout << "Average age = " << avgAge << endl;
  return 0;
}

9.cpp

#include <iostream>

using namespace std;

inline float areaOfCircle(float radius){
  return 3.14*radius*radius;
}

int main() {
  float rad;
  cout << "Enter the radius of a circle: ";
  cin >> rad;
  cout << "Area of circle is: " << areaOfCircle(rad) << endl;
  return 0;
}