Question

How to check if the first-letter of a string is lowercase in C

Answer 1

#include <stdio.h> 
#include <stdbool.h> 

bool IsLower(char ch);
 
int main(void)
{   
    char s1[] = "C programming language";
    if (IsLower(s1[0]))
        puts("first letter lowercase");
    else
        puts("first letter not lowercase");
        
       
    char s2[] = "c programming language";
    if (IsLower(s2[0]))
        puts("first letter lowercase");
    else
        puts("first letter not lowercase");
     
    return 0;
}
bool IsLower(char ch) 
{
    if (ch >= 'a' && ch <= 'z')
        return true;
       
    return false;
}
 
       
/*
run:
    
first letter not lowercase
first letter lowercase
  
*/

 

70+ SQL courses for beginners and professionals