Question

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

Answer 1

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

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

 

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