C and C++ program to perform various operations on strings

#include"iostream.h"
#include"conio.h"
#include"stdio.h"
void findlength()
{
 char str[30];
 int l=0;
 cout<<"\n Enter the string (size < =30) ";
 gets(str);
 while(str[l]!='\0')
 {
  l++;
 }
 cout<<"\n Length Of the given String is: "<< l<< endl;
}
void compare()
{
 char str1[30], str2[30];
 int l1=0,l2=0,i=0,flag=0;
 cout<<"\n Enter the string1 (size< =30) ";
 gets(str1);
 while(str1[l1]!='\0')
 {
  l1++;
 }
 cout<<"\n Enter the string2 (size< =30) ";
 gets(str2);
 while(str2[l2]!='\0')
 {
  l2++;
 }
 if(l2!=l1)
 {
  cout<<"\n Strings are not Equal ";
 }
 else
 {
  for(i=0;i< l1; i++ )
  {
      if(str1[i]!=str2[i])
      {
   flag=1;
   break;
      }
  }
  if(flag==1)
  {

   cout<< "\n Strings are not Equal ";
  }
  else
  {
   cout<< "\n Strings are Equal ";
  }
 }


}

void concat()
{
 char str1[30], str2[30];
 int l1=0,l2=0,i=0,flag=0;
 cout<<"\n Enter the string1 (size< =30 ) ";
 gets(str1);
 while(str1[l1]!='\0')
 {
  l1++;
 }
 cout<<"\n Enter the string2 (size< =30 ) ";
 gets(str2);
 while(str2[l2]!='\0')
 {
  l2++;
 }
 for(i=0;i < l2;i++)
 {
  str1[l1+i]=str2[i];
 }
 str1[l1+l2]='\0';
 cout<<"\n The concatenated String is: ";
 puts(str1);

}


void main()
{
 clrscr();
 cout<<" Enter your choice \n \t1.Find length of string\n\t"
 "2.Compare two Strings \n\t3.Concatenate two strings\n\t4.Exit \n";
 char ch;
 cin>> ch;
 do
 {
  if(ch=='1')
   findlength();
  if(ch=='2')
   compare();
  if(ch=='3')
   concat();
  cout<< "Enter your choice \n \t1.Find length of string\n\t"
 "2.Compare two Strings \n\t3.Concatenate two strings\n\t4.Exit \n";
 cin>> ch;

 }while(ch!='4');
 getch();
}

Source:  http://www.learncandcpp.com/2012/02/c-program-to-perform-all-operations-on.html

C and C++ program Program to convert the lowercase letter into uppercase and to increment an integer

# include "iostream.h"
# include "conio.h"
char convert(char ch)
{
 return(ch -32);
}
int increment(int n)
{
 return(++n);
}
void main()
{
 int num;
 char ch1;
 clrscr();
 cout<< "Enter a character in lower case ";
 cin >> ch1;
 cout << "Enter an integer ";
 cin >> num;
 cout<< "\nUpper Case Aplhabet is => " << convert(ch1);
 cout<< "\nIncremented Integer is => " << increment(num);
}

Source:   http://www.learncandcpp.com/2012/02/c-program-from-file-handling-copy-text.html

C and C++ program to find the minimum of two numbers using function overloading

# include "iostream.h"
# include "conio.h"
int min(int a, int b)
{
 if (a< b )
  return(a);
 else
  return(b);
}
char min(char a, char b)
{
 if (a< b )
  return(a);
 else
  return(b);
}
double min(double a, double b)
{
 if (a< b )
  return(a);
 else
  return(b);
}
void main()
{
 int n, n1;
 char ch, ch1;
 double d, d1;
 clrscr();
 cout << "Enter two integers ";
 cin >> n >> n1;
 cout << "Enter two characters ";
 cin >> ch >> ch1;
 cout << "Enter two double precision quantity ";
 cin >> d >> d1;
 cout << "\nMinimum of two integer "<< min(n,n1);
 cout << "\nMinimum of two characters "<< min(ch,ch1);
 cout << "\nMinimum of two double precision quantity "<< min(d,d1);
}

C and C++ program to calculate the square root of different numbers

# include"iostream.h"
# include"math.h"
int sroot(int  n)
{
 return(sqrt(n));
}
long int sroot(long int  n)
{
 return(sqrt(n));
}
double sroot(double n)
{
 return(sqrt(n));
}
void main()
{
 int num;
 long int num1;
 double num2;
 cout << "Enter the value of num ";
 cin >> num;
 cout <<  "Enter the value of num1";
 cin >> num1;
 cout << "Enter the value of num2 ";
 cin >> num2;
 cout << "\nSquare root of int is " << sroot(num);
 cout << "\nSquare root of long int is " << sroot(num1);
 cout << "\nSquare root of double is " << sroot(num2);
}

C and C++ program to calculate area of square and area of rectangle using function

#include "iostream.h"
int area(int s)
{
 return(s * s);
}
float area(int b , int h)
{
 return(0.5 * b * h);
}
main()
{
 cout << area(5) << endl;
 cout << area(4,3) << endl;
 cout << area(6, area(3)) << endl;
 return 0;
}
 
Source: http://www.learncandcpp.com/2012/02/c-program-to-find-area-of-rectangle.html

C and C++ program to calculate the area of rectangle, area of triangle, and area of circle.

#include "iostream.h"
#include "conio.h"
#include "iomanip.h"
#include "math.h"
float area(float a, float b , float c);
float area(float l, float w);
float  area(float  r);
void main()
{
 char ch;
 float len, wid, n1, n2, n3, ar;
 float  radius;
 int choice1;
 clrscr();
 cout << "\n1. For area of triangle ";
 cout << "\n2. For area of rectangle ";
 cout << "\n3.  For area of circle ";
 cout << "\nEnter choice : ";
 cin >> choice1;
 if (choice1 == 1)
 {
  cout << "\nEnter the three sides of triangle : ";
  cin >> n1 >> n2 >> n3;
  ar = area(n1, n2, n3);
  cout << "\nArea of triangle is : " << ar;
 }
 if (choice1 == 2)
 {
  cout << "\nEnter the length : ";
  cin >> len;
  cout << "\nEnter the width : ";
  cin >> wid;
  cout << "\nArea of rectangle is: " << area(len, wid);
 }
 if (choice1 == 3)
 {
  cout << "\nEnter the radius : ";
  cin >> radius;
  cout << "\nArea of circle : " << area(radius);
 }
}
float area(float a, float b , float c)
{
 float s;
 float a1;
 s = (a + b + c) / 2;
 a1 = sqrt(s * (s-a) * (s-b) * (s-c));
 return(a1);
}
float area(float l, float w)
{
 return(l*w);
}
float  area( float  radius)
{
 return(3.14 * radius * radius);
}

Source: www.LearnCandCpp.com

C and C++ program to calculate area of rectangle and triangle using function overloading

#include "iostream.h"
#include "conio.h"
#include "iomanip.h"
#include 
float area(float a, float b , float c);
float area(float l, float w);
float  area(float  r);
void main()
{
 char ch;
 float len, wid, n1, n2, n3, ar;
 float  radius;
 int choice1;
 clrscr();
 cout << "\n1. For area of triangle ";
 cout << "\n2. For area of rectangle ";
 cout << "\n3.  For area of circle ";
 cin >> choice1;
 if (choice1 == 1)
 {
  cout << "\nEnter the three sides of triangle : ";
  cin >> n1 >> n2 >> n3;
  ar = area(n1, n2, n3);
  cout << "\nArea of triangle is: " << ar;
 }
 if (choice1 == 2)
 {
  cout << "\nEnter the length ";
  cin >> len;
  cout << "\nEnter the width: ";
  cin >> wid;
  cout << "\nArea of rectangle is: " << area(len, wid);
 }
 if (choice1 == 3)
 {
  cout << "\nEnter the radius ";
  cin >> radius;
  cout << "\n Area of circle " << area(radius);
 }
}

Source: www.LearnCandCpp.com