Does'nt excute program always crashes

I wrote this code to convert a mathematical equation from 1 form to another but when you put in everything it just crashes. I was hoping if some can point out my mistakes to me.

Code:

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#include <stdio.h>
#include <math.h>


int main()
{
        char z,w,G,num,den;
        float Ts;
        z=z;
       
w=z-1/Ts;

G=num/den;

printf("Please enter the samplling rate: ");
scanf("%f",&Ts);
       
printf("Please enter the numarator in terms of w: ");
scanf("%s",&num);

printf("Please enter the denominator in terms of w: ");
scanf("%s",&den);

printf("The discrete transfer function in the form of Z is %s \n",G);

return 0;
}

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You are asking for a string here:

Code:

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scanf("%s",&num);

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Yet you are trying to put it into a single char variable. That will not work. You should either store your string (which is what scanf is looking for with %s) in an array, or else change your call to scanf to be looking for a single char (%c) If you do go the first way, then you ought to limit the amount of input to you scanf call with a width specifier, so the user does not overflow the array.

Huh?

You already posted almost identical code to another thread, which already contains feedback. The only things you've done different this time is add #include <math.h>, which doesn't make any difference, because you're not using anything from math.h, and you changed the format string from %c to %s, which makes even less sense. If you want to read in the numbers as strings first and convert them, then read them into a char array, not a single character.

Pay attention to the feedback on the previous thread, and if you have other questions, post them on that thread.

This thread should probably be locked.