C++ is one of the most popular programming languages. It is based on C but is an object-oriented programming language. It is widely used in graphics libraries, games, network devices, etc. C++ is a general-purpose programming language. It has imperative, object-oriented and generic programming features, while also providing facilities for low-level memory manipulation.

//Program to check whether the number is string or not

#include<iostream.h>

#include<conio.h>

#include<stdio.h>

void main()

{clrscr();

char string[10];

int i;

cout<<"\n enter the string:";

 gets(string);

 for(i=0;string[i]!='\0';i++)

 {if(string[i]>=65 && string[i]<=92)

    string[i]=string[i]+32;

  string[i]=string[i];

  }

  cout<<"\n the converted string is:"<<string;

    getch();

   }