i get a fatal error c1075 and can't find where i need to add another curved bracket

[Dan Oren]

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <conio.h>
void main ()
{
    int month,year;
    int days,weeks,left;
    char x;
    float a,b,c;
    do
    {
    puts("Please enter:\nL to solve a linear equation\nD to calc the num of days in month\nW to calc the num of weeks and days");
    fflush(stdin);
    scanf("%c",&x);
        while (x!= 'L' && x!='D' &&x!='W')                
    {
        printf("Please type (L or D or W)\n");
        fflush(stdin);
        scanf("%c",&x);
    }
    switch(x) 
    {
        case 'L':                                    
        puts("Please insert equation ax+b=0 argument (float): a ant than b");
        fflush(stdin);
        scanf("%f%f",&a,&b);
        if (a==0 && b==0)
            printf("there is infinity sulotions for the linear equation: %fx+%f=0 ",a,b);
        else if (a==0)
            printf("there is no sulotion for the linear equation: %fx+%f=0 ",a,b);
        else
        {
            b=b*-1;
            c=b/a;
            printf("\nThe single sulotion for the linear equation is: %f\n",c);
        }
        break;
        case 'D':                                            
        puts("Please enter the month (1 - 12) and the year");
        fflush(stdin);    
        scanf("%d%d",&month,&year);
        while (month > 12 || month < 1)                        
        {
            puts("No man! Please enter the month (1 - 12) and the year");
            fflush(stdin);    
            scanf("%d%d",&month,&year);
        }
        if (month==2)
        {    
            if (year%4==0,year%400==0)
                printf("The num of days is 28\n");
            else
                puts("The num of days is 29");
        }
        else if(month<=7)
        {
            if (month%2==1)
            puts("The num of days is 31");
            else
            puts("The num of days is 30");
        }
        else
        {
            if (month%2==0)
            puts("The num of days is 31");
            else
            puts("The num of days is 30");
        }
        break;
        default:                                            
        puts("Please enter a num of days");
        fflush(stdin);
        scanf("%d",&days);
        while (days<0)
            {
                puts("Please try again to enter a positive num of days");
                fflush(stdin);
                scanf("%d",&days);
            }
        weeks=days/7;
        left=days%7;
        printf("The num of weeks is: %d and the num of days is: %d\n" , weeks ,left);
        break;
    }
    puts("\n\npress any key to finish . . .");
    _getch();
    printf("\n===========================================================\n\n");
    puts("\n\nGood bye and thank you, hope you enjoyed with my prog, dog.\n\n");
    }
 

[donbock]

In the future, please provide the full text of the compiler error message. That would make it a lot easier to help you.

I don't know if these issues are related to this error, but ...

1. Lines 26 and 35: the variable types are not consistent with the format string.
2. Lines 26, 41, 46: you may need a separator between the two numbers.
3. Line 50: the if-condition is illegal.
4. Lines 13, 18, 25, 40, 45, 72, 77: I'm not sure, but I think flushing stdin yields undefined behavior.