Example 1: The function srnd(a) rounds sqrt(a) to 
the nearest integer. 

#include <iostream>
#include<cmath>
using namespace std;

// function definition for srnd
int srnd(double a) {
  int rvalue;
  double b = sqrt(a);

  if ((b-floor(b)) >= 0.5) 
    rvalue = ceil(b);
  else 
    rvalue = floor(b);

  return rvalue;
}

int main() {
  double x;

  cout << "Input a positive real number \n";
  cin >> x;
  cout <<"The sqrt (rounded to nearest integer) is "<< srnd(x) <<"\n";

  return 0;
}


Example 2 : The function strlt(str1,str2) returns 1 if 
str1 is smaller than str2 (in the dictionary ordering)
and 0 otherwise.

#include <iostream>
#include <cstring>
using namespace std;

int strlt(char str1[], char str2[]) {
  int c=0;

  while (str1[c] == str2[c])
    c++;

  if (str1[c] < str2[c])
    return 1;
  else
    return 0;
}

int main() {
  char str1[40], str2[40];

  cout << "Enter the two words \n";
  cin >> str1 >> str2; // Only works with character arrays

  if (strlt(str1, str2)) 
    cout << str1 << "  " << str2 << "\n";
  else
    cout << str2 << "  " << str1 << "\n";

  return 0;
}