C Program to accept string from user & convert all lower case letters into upper case letters & vice versa

C Program to accept string from user & convert all lower case letters into upper case letters & vice versa

How to Write a c program to accept string from user & convert all lower case letters into upper case letters & vice versa in C Programming Language ?

Solution:
/*C Program to accept string from user & convert all lower case letters into upper case letters & vice versa*/

#include<stdio.h>
#include<conio.h>
#include<ctype.h>
#include<string.h>
  void main()
{
  char str[30];
  clrscr();
  printf("\nEnter the string: ");
  gets(str);
  printf("\nEntered string is: ");
  puts(str);
  if(isupper(str[0]))
{
  strupr(str);
}
  else
{
  strlwr(str);
}
  printf("\nThe converted string format is: %s",str);
  getch();
}

//OUTPUT:

//Enter the string: vINIT

//Entered string is: vINIT

//The converted string format is: vinit


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