panagram w c

#include<stdio.h>
#include<conio.h>
void main()
{
    char str[100]="The quick brown fox jumps over the lazy dog";
    int i,value[26]={0},count=0;
    for(i=0;str[i]!='\0';i++)
    {
        if('a'<=str[i] && str[i]<='z')
        {
            count+=!value[str[i]-'a'];
            value[str[i]-'a']=1;
        }
        else if('A'<=str[i] && str[i]<='Z')
        {
            count+=!value[str[i]-'A'];
            value[str[i]-'A']=1;
        }
    }
    if(count==26)
    {
        printf("The String is a Pangram String.");
    }
    else
    {
        printf("The String is not a Pangram String.");
    }
    getch();
}
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