c program to convert lower case to upper case

For beginners
{I am going write the c program but before you need a c compiler(software).there are a lot of compilers(software) for windows 7  like  Code::Blocks,dev c++ .Download dev c++ its free and install it in your computer.open  dev c++ go to file-->new-->source file.}  


#include<stdio.h>
#include<ctype.h>
#include<conio.h>
main()
{
      char alp;
      printf("enter an alphabet\n");
      alp=getchar();
      if(islower(alp))
      putchar(toupper(alp));
      else
      putchar(tolower(alp));
      getch();
      }

For beginners

{After typing this program go to execute-->compile & run-->a window will pop-up-->give file name:(anything u like)-->save as type: c source files-->click save.}

IS IT HELPFIL? comment.