C language toupper() function: convert lowercase letters to uppercase letters

Function name : toupper

Header file : <ctype.h>

Function prototype : int toupper(int ch);

Function : Convert lowercase letters to uppercase letters, not lowercase letters.

Parameters : int ch character to be converted

Return value : Returns the converted character

Program example : Convert lowercase letters to uppercase letters

 #include<ctype.h>#include<stdio.h>intmain(){charch1,ch2;printf(inputacharacter:);scanf(%c,&ch1);ch2=toupper(ch1);printf(transform%cto%c .n,ch1,ch2);return0;}

Running results:

 inputacharacter:gtransformgtoG.