C Reference Lower Case Letter Test: islower()
The islower() function returns a non-zero if its argument is a lowercase letter. If the argument is not a lowercase letter, then zero is returned.
islower() source code example:
#include<stdio.h>
#include<ctype.h>
int main()
{
char a;
scanf( "%c", &a );
if( islower(a) )
printf( "Is lower case: %c\n", a );
else
printf( "Is NOT lower case: %c\n", a );
return 0;
}
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