Create your own version of tolower() and toupper() - C String

C examples for String:String Function

  1. HOME
  2. C
  3. String
  4. String Function

Description

Create your own version of tolower() and toupper()

Demo Code

#include <stdio.h> 
#include <ctype.h> 
#include <string.h> 

//function prototypes 
void convertL(char *); 
void convertU(char *); 

int main()/*w  ww. ja v  a2  s . c  o  m*/
{ 
   char name1[] = " from "; 
   char name2[] = " book2s.com "; 
   convertL(name1); 
   convertU(name2);  
}
void convertL(char *str) { 
   int x; 
   for ( x = 0; x <= strlen(str); x++ ) 
      str[x] = tolower(str[x]); 
   printf("\nFirst name converted to lower case is %s\n", str); 
}

void convertU(char *str) { 
   int x; 
   for ( x = 0; x <= strlen(str); x++ ) 
      str[x] = toupper(str[x]); 
   printf("Last name converted to upper case is %s\n", str); 
}

Result


Related Tutorials