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Introduction To C++ Programming - Part 10.

C++ Program To Convert Binary Number To Decimal & Vice-Versa.
#include <iostream>
#include <cmath>
using namespace std;

int binary_decimal(int n);
int decimal_binary(int n);
int main() {

int n;
char c;
cout << "Instructions: " << endl <<endl;
cout << "1. Enter Alphabet 'd' To Convert Binary To Decimal." << endl;
cout << "2. Enter Alphabet 'b' To Convert Decimal to Binary." << endl << endl;

cin >> c;
if (c =='d' || c == 'D') {
cout << "\nEnter A Binary Number: ";

cin >> n;
cout << endl << n << " In Binary = " << binary_decimal(n) << " In Decimal" << endl;
}

if (c =='b' || c == 'B') {
cout << "\nEnter A Decimal number: ";
cin >> n;

cout << endl << n << " In Decimal = " << decimal_binary(n) << " In Binary" << endl;
}
return 0;
}

int decimal_binary(int n) {
int rem, i=1, binary=0;

while (n!=0) {
rem=n%2;
n/=2;

binary+=rem*i;
i*=10;
}
return binary;
}

int binary_decimal(int n) {
int decimal=0, i=0, rem;

while (n!=0) {
rem = n%10;
n/=10;

decimal += rem*pow(2,i);
++i;
}
return decimal;
}

C++ Program To Find the Frequency Of Characters In A String.
#include <iostream>
#include <cstring>
using namespace std;

int main() {
char c[1000],ch;
int i, count=0;

cout << "Enter A Sentence: ";
cin.getline(c, 1000);
cout << "\nEnter A Character To Find Frequency: ";
cin >> ch;

for(i=0;c[i]!='\0';++i) {
if(ch==c[i])
++count;
}
cout << "\nFrequency Of " << ch <<  " = " << count;
return 0;
}

C++ Program To Copy One String Into Another String.
Method 1:
#include <iostream>
#include <cstring>
using namespace std;

int main() {
char s1[1000], s2[1000];
int i;

cout << "Enter A Sentence: ";
cin.getline(s1, 1000);

for(i=0; s1[i]!='\0'; ++i) {
s2[i]=s1[i];
}
s2[i]='\0';
cout << "\nYou Wrote: " << s2 << "\n";
return 0;
}

Method 2:
int main() {
char s1[1000], s2[1000];

cout<<"Enter A Sentence: ";
cin.getline(s1, 1000);

strcpy(s2, s1);
cout << "\nYou Wrote: " << s2 << "\n";
return 0;
}
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