C program to accept string from user and convert all lower case letters into upper case and vice-versa.

Write a ‘C’ program to accept string from user and convert all lower case letters into upper case and vice-versa.

#include<stdio.h>
#include<conio.h>
void main()
{
  char name[80];
  int l,i;
  clrscr();
  printf("Enter the String");
  gets(name);
  l=strlen(name);
  for(i=0;i<l;i++)
  {
    if(islower(name[i]))
    {
      printf("%c",toupper(name[i]));
    }
    else  if(isupper(name[i]))
    {
      printf("%c",tolower(name[i]));
    }
    else
    {
      printf("%c",name[i]);
    }
  }
  getch();
 }