word search

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

void bblsrt(char str[][100], int n)
{
    int j, k;
    char s[100];
    for(j = 0; j < n-1; j++){
        for(k = 0; k < n-j-1; k++){
            if(strcmp(str[k], str[k+1]) > 0){
                strcpy(s, str[k]);
                strcpy(str[k], str[k+1]);
                strcpy(str[k+1], s);
            }
        }
    }
}

int bisearch(char str[][100], char s[], int l)
{
    int hi = l-1, lo = 0, mid;
    while(lo <= hi){
        mid = (hi+lo)/2;
        if(strcmp(str[mid], s) > 0)hi = mid-1;
        else if(strcmp(str[mid], s) < 0)lo = mid+1;
        else return 1;
    }
    return 0;
}

int main()
{
    int i, j, k;
    char str_lst[10000][100], str[100];
    printf("To terminate input, press enter button two times.\n");
    i = 0;
    gets(str);
    while(strcmp(str, "\0")){
        strcpy(str_lst[i], str);
        i++;
        gets(str);
    }

    if(i == 0)printf("No input\n");
    else{
        bblsrt(str_lst, i);
            /*for(j = 0; j < i; j++){
                 printf("%s\n", str_lst[j]);
            }*/

        printf("Now, enter the word to search: ");
        gets(str);

        if(bisearch(str_lst, str, i))printf("Yes");
        else printf("No");
    }
    return 0;
}