Some more programs using C++ Library Functions:

//program demonstrating the use of the functions - atoi(), atol(), itoa(), ltoa()

#include <iostream.h>

#include <stdlib.h>

int main()

{

int val1;//variable t store an integer value

long int val2;//variable to store a long integer value

int num1=12345;

long int num2=123456789;

char *str1="12345.33";

char *str2="23456789";

char string[30],string2[30];

val1=atoi(str1)+150;//adding 150 after converting the string to integer

val2=atol(str2)+1500;//adding 1500 after converting the string to long integer

itoa(num1,string,10);//converting an integer to string

ltoa(num2,string2,10);//converting an long int to string

cout<<"\n String was = "<<str1<<" and the new integer = "<<val1<<endl;

cout<<"\n String was = "<<str2<<" and the new long integer = "<<val2<<endl;

cout<<"\n Integer was = "<<num1<<" and the new string = "<<string<<endl;

cout<<"\n Integer was = "<<num2<<" and the new string = "<<string2<<endl;

return 0;

}

Output:

/*program to print the entered name in title case: This program is using strlen(), toupper(), tolower() functions*/

#include <iostream.h>

#include <string.h>

#include <ctype.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

int main()

{

clrscr();

char fname[30];char lname[30];

int flength,llength;

char temp;

cout<<"\n Enter Your First Name: ";

cin>>fname;

fflush(stdin);

cout<<"\n Enter Your Second Name: ";

cin>>lname;

flength=strlen(fname);

llength=strlen(lname);

     for(int i=0;i<flength;++i)

   {

      if(i<flength)

      {

     if(i == 0)

     {

     temp=fname[i];

      fname[i]=toupper(temp);

      }

      else

      fname[i]=tolower(fname[i]);

   }

   for(int i=0;i<llength;++i)

   {

      if(i == 0)

       lname[i]=toupper(lname[i]);

       else

       lname[i]=tolower(lname[i]);

   }

}

strcat(fname," ");

strcat(fname,lname);

cout<<"\nHello! "<<fname;

getch();

return 0;

}

Output:

/*Program to count total number of alphabets, digits, spaces, other characters present in a line of text entered. This program is using isalpha(), isdigit(), isspace() functions */

#include <iostream.h>

#include <ctype.h>

#include<conio.h>

int main()

{

char line[100];

clrscr();

int alpha=0,digi=0,spc=0,other=0,chars=0;

cout<<"\n Enter a line of text: ";

cin.getline(line,100);

     for(int i=0;line[i]!=NULL;++i)

   {

     if(isalpha(line[i]))

      alpha++;

      else if(isdigit(line[i]))

      digi++;

      else if(isspace(line[i]))

      spc++;

      else

      other++;

   }

   chars = alpha+digi+spc+other;

cout<<"\n Total Alphabets Present = "<<alpha;

cout<<"\n Total Digits Present = "<<digi;

cout<<"\n Total Spaces Present = "<<spc;

cout<<"\n Total Other characters Present = "<<other;

cout<<"\nTotal = "<<chars;

getch();

return 0;

}

Output: