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Introduction [cont'd]
Input Output Functions [cont'd]
Structures and Unions [cont'd]
# Preprocessor [cont'd]
ctype.h in Introduction of Programming in C
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Ctype.h - Characters type 
ctype.h header file has set of functions to transform and check characters. isalnum(), isalpha(), isdigit(), isblank(), toupper(), tolower() etc
Program
#include
void main(){
   printf("%c\n",toupper('a'));
   printf("%c",tolower('A'));
}
Output 
A
a
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