C Library Functions -islower()
C Standard Library - <ctype.h>
Description
C Library Functionsint islower(int c)Check whether the passed character is a lowercase letter.
Declaration
Below is the declaration of the islower() function.
int islower(int c);
Parameter
- c-- This is the character to be checked.
Return Value
If c is a lowercase letter, the function returns a non-zero value (true); otherwise, it returns 0 (false).
Example
The example below demonstrates the usage of the islower() function.
#include <stdio.h>
#include <ctype.h>
int main()
{
int var1 = 'Q';
int var2 = 'q';
int var3 = '3';
if( islower(var1) )
{
printf("var1 = |%c| 是小写字母\n", var1 );
}
else
{
printf("var1 = |%c| 不是小写字母\n", var1 );
}
if( islower(var2) )
{
printf("var2 = |%c| 是小写字母\n", var2 );
}
else
{
printf("var2 = |%c| 不是小写字母\n", var2 );
}
if( islower(var3) )
{
printf("var3 = |%c| 是小写字母\n", var3 );
}
else
{
printf("var3 = |%c| 不是小写字母\n", var3 );
}
return(0);
}
Let us compile and run the above program, this will produce the following result:
var1 = |Q| 不是小写字母 var2 = |q| 是小写字母 var3 = |3| 不是小写字母other extensions