#include <stdio.h>
#include <math.h>
void main()
{
    float a,b,m;
    char z;

    printf("Please enter:\nL to solve a linear equation\nD to calculate the number of days in month\nW to calculate the number of weeks and days\n");
    fflush(stdin);
    scanf("%c",&z);
    if (z=='L')
        printf("Please enter the equation ax+b=0 arguments: a and b\n");
        fflush(stdin);
        scanf("%f%f", &a,&b);
        {
            if(a==0 && b==0)
                printf("There are infinity solutions\n");
            if(a!=0 && b!=0)
            {
                m=-b/a;
                printf("There is a single solution: %f\n", m);
            }
            if(a==0 && b!=0)
                printf("There is no solution for the equation\n");



        }


    getchar();
    getchar();
}