(Q-3-3) ALTERNATE SOLLUTION

#include <stdio.h>
int main()
{
    int i, a[100], n = 10, sem, Pfizer = 0, Sinopharm = 0, Moderna = 0, Sputnik = 0;
    char flag;

    for (i = 1; i <= n; i++)
    {
        printf("1. Pfizer\n");
        printf("2. Sinopharm\n");
        printf("3. Moderna\n");
        printf("4. Sputnik\n");

        printf("\nEnter the number of your vaccine : ");
        scanf("%d", &a[i]);
        if (a[i] == 1)
        {
            Pfizer++;
        }
        else if (a[i] == 2)
        {
            Sinopharm++;
        }
        else if (a[i] == 3)
        {
            Moderna++;
        }
        else if (a[i] == 4)
        {
            Sputnik++;
        }
        else
        {
            printf("Invalid.\n");
        }
    }

    printf("The number of Pfizer = %d\n", Pfizer);
    printf("The number of Sinopharm = %d\n", Sinopharm);
    printf("The number of Moderna = %d\n", Moderna);
    printf("The number of Sputnik = %d\n", Sputnik);
    return 0;
}