islower() - Character Function

How is "islower()" used in C++?


islower() is used to check the function arguments for lowercase letters (a-z). It returns zero if lowercase letters (a-z) are not found.


int islower( int c );

Example :

#include <stdio.h>
#include <ctype.h>
int main()
int n;
int count =0;
char str[]="aAaasadaZZZ";
for ( n=0 ; str[n]!='' ; n++)
{ count++; }
printf ("The string has %d lower-case characters.\n", count);
return 0;

Result :

The string has 7 lower-case characters.

In the above example, this function is used to check the lowercase letters (a-z) in the array "str". The checking is based on the ASCII values.

C++ Tutorial

Ask Questions

Ask Question