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Convert Text to Uppercase and Lowercase with strupr() and strlwr()

strupr()

strupr() converts a string into uppercase. strlwr() is useful to convert a string into lowercase.

Example: to convert string into upper and lower case, we can write:

strupr(string);
strlwr(string);    

Program to convert a string into uppercase and lowercase

#include<stdion.h>
#include<string.h>
void main()
{
   char string[100];
   printf("\nEnter a string:");
   gets(string);

   puts("\n uppercase");
   puts(strupr(string));

   puts("\n lowercase");
   puts(strlwr(string));
}

Output:

      Enter a string:  Nav Tutorials
      In uppercase:  NAV TUTORIALS
      In lowecase:  nav tutorials