//Declaration: int islower(int ch);
//Return: returns nonzero if ch is a lowercase letter;
otherwise zero is returned.
#include
#include
int main(void)
{
char ch;
for(;;) {
ch = getchar();
if(ch == '.'){
break;
}
if(islower(ch)){
printf("%c is lowercase\n", ch);
}
}
return 0;
}
/*
1
2
d
d is lowercase
g
g is lowercase
y
y is lowercase
e
e is lowercase
d
d is lowercase
Z
.
*/