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2013-10 2013-09 2013-08

C library function - tolower()

September 6, 2013 Posted by: GPA Views: 580 0 comments

Problem

C library function - tolower(). Write simple application using this function.

Solution

This function converts an uppercase letter to a lowercase letter and returns the lowercase letter. For using this function you must include <ctype.h> library.

Declaration:

int tolower(int value); 

where value is the character to be checked. 

If value is an uppercase letter, it returns value as a lowercase letter. Otherwise, tolower returns the argument unchanged.

Example:

 

   

 
#include <stdio.h>
#include <ctype.h>
int main(int argc, char *argv[])
{
     char inputString[100];
char lowerStringOutput[100];
     int i=0;
     printf("globalproganswer.com\n");
     printf("Enter string: ");//promt user to enter some value
     scanf("%s",&inputString);//read from keyboard
     //call function isupper and show result
     while(inputString[i])  {
        lowerStringOutput[i]=tolower(inputString[i]);
        i++;
    }
   printf("Lower string is: %s\n",lowerStringOutput);
    system("PAUSE");
  return 0;
} 

Output

c library function - tolower

Download this example

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