Strong Pass

#include<stdio.h>
#include<string.h>


int main()
{
    char seq[100];
    int length, a = 0, num = 0, space = 0, low = 0, up = 0, n, i;

    printf("Enter the password: ");
    scanf(" %[^\n]", seq);

    length = strlen(seq);

    while(1)
    {

        if(a == 2){

            printf("Please enter again: ");
            scanf(" %[^\n]", seq);
            length = strlen(seq);
        }
        else if(a == 1){
            break;
        }
        if(length >= 8)
        {

            for(i=0; i<length; i++)
            {

                if(seq[i] == ' ')
                {

                    printf("Weak Password! ");
                    a = 2;
                    break;

                }
                if(seq[i]>= 97 && seq[i]<=122)
                {

                    low++;
                }
                else if(seq[i]>=65 && seq[i]<=90)
                {

                    up++;
                }
                else if(seq[i]>=48 && seq[i]<=57)
                {
                    num++;
                }
            }

            if(low >=1 && up>=1 && num>=1)
            {

                printf("Strong Password!\n");
                a = 1;
            }
            else
            {

                printf("Weak Password!");
                a = 2;
                continue;
            }
        }
        else{
            printf("Weak Password! ");
            a = 2;
            continue;
        }
    }
}