binary.c

#include <stdio.h>
#include <string.h>
#include <cs50.h>

int search(char** students, char* student_name, int len);

int main(void)
{
    char* students[5] = {
      "Ahmed",
      "Bebo",
      "Cedo",
      "Dedo",
      "Eno"
    };

    printf("Put student name: ");
    char* student_name = get_string();

    if(search(students, student_name, sizeof(students) / sizeof(char*)))
    {
        printf("%s is sucess\n", student_name);
    }
    else
    {
        printf("%s is faild\n", student_name);
    }
}


int search(char** students, char* student_name, int len) {


    int left = 0;
    int right = len;

    while (right >= left) {
    int mid = (left + right) / 2;
    if (strcmp(students[mid], student_name) == 0)
        return 1;
    else if (strcmp(students[mid], student_name) > 0)
        right = mid - 1;
    else
        left = mid + 1;
    }

    return 0;

}