prowessapps.in Function and Pointers Programs in C++

#include<iostream>
using namespace std;
void swap(int, int);
int main( ){
 int x,y;
 cout<<"Enter X: ";
 cin>>x;
 cout<<"Enter Y: ";
 cin>>y;
 cout<<"\nBEFORE SWAP:\n";
 cout<<"X = "<< x<<" and Y = "<< y;
 swap(x,y);
 return 0;
}
void swap(int x, int y){
 int temp = x;
 x = y;
 y = temp;
 cout<<"\n\nAFTER SWAP : \n";
 cout<<"X= "<< x<<" and Y= "<< y;
}

OUTPUT
Enter X: 15
Enter Y: 20

BEFORE SWAP:
X=15 and Y=20

AFTER SWAP:
X=20 and Y=15

#include<iostream>
using namespace std;
int fact(int);

int main(){
 int n,res;
 cout<<"Enter number: ";
 cin>>n;
 res = fact(n);
 cout<<"Factorial : "<< res;
 return 0;
}

int fact(int x){
 int i, f=1;
 for(i=1; i<=x; i++){
  f = f*i;
 }
 return f;
}
OUTPUT
Enter a Number : 6
Factorial = 720

#include<iostream>
using namespace std;
int fact(int);

int main(){
 int n,r, res;
 cout<<"Enter n: ";
 cin>>n;
 cout<<"Enter r: ";
 cin>>r;
 res = fact(n)/(fact(n-r)*fact(r));
 cout<<"Result nCr Is: "<< res;
}

int fact(int x){
 int i, f=1;
 for(i=1; i<=x; i++){
  f = f*i;
 }
 return f;
}
OUTPUT
Enter n: 5
Enter r: 3
Result nCr Is : 10

#include<iostream>
using namespace std;
int fact(int);

int main(){
 int n,res;
 cout<<"Enter number: ";
 cin>>n;
 res = fact(n);
 cout<<"Factorial : "<< res;
 return 0;
}


int fact(int x){
 if(x==0 || x==1){
  return 1;
 }
 else{
  return x*fact(x-1);
 }
}
OUTPUT
Enter a Number : 5
Factorial = 120

#include<iostream>
using namespace std;
int lcm(int , int);
int hcf(int , int);
int main( ) {
 int a,b;
 cout<<"Enter two Number : ";
 cin>>a>>b;
 int lc=lcm(a,b);
 int hc =(a>b)?hcf(a,b):hcf(b,a);
 cout<<"LCM = "<< lc<< endl;
 cout<<"HCF = "<< hc<< endl;
return 0;
}
int lcm(int a, int b) {
 int res = a*b/hcf(a,b);
 return res;
}
int hcf(int a, int b) {
 int rem;
 while( b != 0) {
   rem = a%b;
   a = b;
   b = rem;
 }
 return a;
}
OUTPUT
Enter two Number : 15 50
LCM = 150
HCF = 5

#include<iostream>
using namespace std;
int fact(int);
int main( ){
 int i, sum=0;
 for(i=1; i<=5; i++){
  sum = sum+fact(i);
 }
 cout<<"SUM = "<< sum;
 return 0;
}
int fact(int x){
 if(x==0 || x==1){
  return 1;
 }
 else{
  return x*fact(x-1);
 }
}
OUTPUT
SUM = 153

#include< iostream >
int fact(int);
float power(int,int);
int main( ){
 int i;
 float sum;
 for(i=0; i<=6; i++){
   sum = sum+power(i,i-1)/fact(i);
 }
 cout("Sum = %f\n",sum);
 return 0;
}

int fact(int x){
 if(x==0 || x==1){
  return 1;
 }
 else{
  return x*fact(x-1);
 }
}
float power(int x, int y){
 int j, result=1;
 for(j=1; j<=y; j++){
  result = x*result;
 }
 return result;
}
OUTPUT
Sum = 22.174999

#include<iostream>
#include<math.h>
using namespace std;
float cal_cos(int, int);
int fact(int);
int main( )
{

 int x, n;
 cout<<"Enter the value of x : ";
 cin>>x;
 cout<<"Enter the value of n : ";
 cin>>n;
 float r = cal_cos(x, n);
 cout<<"Result = "<< r;
 return 0;
}
float cal_cos(int a, int n) {
 int i,j =2 ;
 float sum = 1;
 for(i=1; i<=n; i++)
 {
  if(i%2 ==0)
  {
   sum = sum+pow(a,j)/(float)fact(j);
 }
 else
  {
   sum = sum-pow(a,j)/fact(j);
  }
 }
 return sum;
}

int fact(int x){
 int i, f=1;
 for(i=1; i<=x; i++){
  f = f*i;
 }
 return f;
}

OUTPUT
 Enter the Value of x : 3
 Enter the Value of n : 3
 Result = -1.250000

#include<iostream>
using namespace std;
int main( ) {
 int a, b, *p, *q, sum;
 cout<<"Enter two number : ";
 cin>>a>>b;
 p = & a;
             q = & b;
             sum = *p + *q;
 cout<<"SUM = "<< sum<< endl;
 return 0;
}

OUTPUT
Enter two number : 10 20
SUM = 30

#include<iostream>
using namespace std;
int main( ) {
 int x, y, *a, *b, temp;
 cout<<"Enter the value of X and Y : ";
 cin>>x>>y;
 cout<<"Before Swapping\n";
 cout<<"X = "<< x<<"\nY = " << y;
 cout<< endl;
 a = & x;
             b = & y;
             temp = *b;
 *b = *a;
 *a = temp;
 cout<<"After Swapping\n";
 cout<<"X = "<< x<<"\nY = " << y;
 return 0;
}

OUTPUT
Enter the value of X and Y : 10 20
Before Swapping
X = 10
Y = 20
After Swapping
X = 20
Y = 10

#include<iostream>
using namespace std;
int main( ) {
 char str[20];
 int length = 0;
 cout<<"Enter any String : ";
 cin.getline(str,20);
 char* p = str;
 while (*p != '\0') {
  length++;
  p++;
  }
  cout<<"Length of "<< str<<" = ";
  cout<< length<< endl;
  return 0;
}

OUTPUT
Enter any String : prowess
Length of prowess is : 7

#include<iostream>
using namespace std;
int main( ) {
 int arr[5], i;
 cout<<"Enter Elements of Array:";
 for(i=0;i<5;i++){
  cin>>arr[i];
 }
  cout<<"You have entered : ";
 for(i=0;i<5;i++){
   cout<< *(arr+i)<<"  ";
 }
 return 0;
}
OUTPUT
Enter Elements of Array : 1 4 6 7 8
You have entered : 1 4 6 7 8

#include<iostream>
#include<math.h>
using namespace std;
long binToDec(long n);
int power(int, int);
int main() {
 long bi;
 cout<<"Enter a binary no. :";
 cin>>bi;
 cout<<"BINARY : "<< bi<< endl;
 cout<<"DECIMAL: "<< binToDec(bi);
 return 0;
}

long binToDec(long n) {
 int rem;
 long dec = 0, i=0;
 while(n != 0) {
  rem = n%10;
  n = n/10;
  dec = dec +(rem*power(2,i));
  ++i;
 }
return dec;
}
int power(int a, int b) {
int res= 1;
for(int i =0; i< b; i++) {
 res = res*b;
}
return res;
}
OUTPUT
Enter a binary no. :11011
 BINARY  : 11001
 DECIMAL : 27

#include<iostream>
#include<math.h>
using namespace std;
long decToBin(long n);
int main() {
 long n;
 cout<<"Enter a decimal no. :";
 cin>>n;
 cout<<"DECIMAL: "<< n<< endl;
 cout<<"BINARY : "<< decToBin(n);
 return 0;
}

long decToBin(long n) {
 int rem;
 long binary = 0, i = 1;
 while(n != 0) {
  rem = n%2;
  n = n/2;
  binary= binary + (rem*i);
  i = i*10;
 }
 return binary;
}
OUTPUT
 Enter a decimal no. : 27
 DECIMAL : 27
 BINARY  : 11001

#include<iostream>
#include<math.h>
using namespace std;
int rev(int, int);
int main() {
 int num, res;
 int length = 0, temp;
 cout<<"Enter a number: ";
 cin>>num;
 temp = num;
 while (temp != 0) {
  length++;
  temp = temp / 10;
 }
 res = rev(num, length);
 cout<<"Reverse = "<< res<< endl;
 return 0;
}

int rev(int n, int len) {
 int x;
 cout<< " this is x"<< n<< endl;
 if (len == 1) {
  return n+1;
 }
 else {
  x = ((n % 10) * pow(10, len-1));

  return ( x + rev(n / 10,--len));
 }
}
OUTPUT
Enter a number: 1234
Reverse = 4321




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