After scanf terminal closes automaticly, whats the problem?

Hi, i'm new to C, and I cannot find the problem, is it somesort of text input failure or what?

Here is the whole program

Code:

---

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <windows.h>
#include <limits.h>
#include <string.h>
int pirma();


int main()
{
    //goto START;
START:
    ;
    system("cls"); //clear screen
    int a=INT_MAX;
    printf("\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\n");
    printf("|        Programos veiksmu pasirinkimas:        |\n");
    printf("|irasykite skaiciu, kurios programos dalies norite|\n");
    printf("///////////////////////////////////////////////////\n");
    printf("|1 - is dvejetaines i desimtaine                  |\n");
    printf("|2 - is dvejetaines i sesioliktaine              |\n");
    printf("|3 - is desimtaines i dvejetaine                  |\n");
    printf("|4 - is desimtaines i sesioliktaine              |\n");
    printf("|5 - is sesioliktaines i dvejetaine              |\n");
    printf("|6 - is desioliktaines i desimtaine              |\n");
    printf("|0 - iseiti is programos                          |\n");
    printf("\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\n");
    scanf("%d", &a);


    system("cls"); //clear screen


    //start of warning if they choose a program that do not exist
    if(a>6)
    {
        int b=0;
        printf("Nera tokios programos\n");
        printf("Paspauskite 1, kad galetumete is naujo pasirinkti\n");
        scanf("%d", &b);
        if(b==1)
        {
            system("cls"); //clear screen
            goto START;
        }
        int c=INT_MAX;
        while(c==INT_MAX)
        {
            printf("Paspauskite 1, kad galetumete is naujo pasirinkti\n");
            scanf("%d", &b);
            if(b==1)
            {
                c=1;
                system("cls"); //clear screen
                goto START;
            }
        }
    }
    //end of warning if they choose a program that do not exist


    //nuline, jei nori iseiti is programos
    if(a==0)
    {
        char p, y="y";
        int lygybe=0;
        printf("Ar tikrai norite iseiti is programos?\n");
        printf("Jei taip, spauskite y\n");
        printf("Jei ne, spauskite n\n");
        scanf("%c", &p);


        lygybe=strcmp(p, y);
        if(lygybe==0)
            exit(0);
        else
            goto START;
    }


    //pirmoji programa
    if(a==1)
    {
        pirma();
    }


    return 0;
}


int pirma()
{
    int binary=0, bp=0; //bp - isaugojimas pradiniu duomenu
    int decimal=0;
    int k=0; //pagalbinis skaiciuojant desimtaini
    int m=1; //kitas pagalbinis, kuris dides
    printf("***********************************************************************************\n");
    printf("**  Iveskite savo norima dvejetaini koda, kuri noretumete paversti desimtainiu:  **\n");
    printf("***********************************************************************************\n");
    scanf("%d", &binary);
    bp = binary;


    while (bp > 0)
    {
        k = bp % 10;
        decimal=decimal+k*m;
        bp=bp/10;
        m=m*2;
    }
    system ("cls");
    printf("HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH\n");
    printf("HH  Jusu pasirinktas dvejetainis kodas: %d", binary);
    printf("                    HH\n");
    printf("HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH\n");


    printf("HH  Gautas desimtainis kodas, konvertutoas is dvejetainio: %d", decimal);
    printf("  HH\n");
    printf("HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH\n");
}

---

But the problem comes when in the start you press 0, and thats where comes scanf I meantioned before

Code:

---

if(a==0)
    {
        char p, y="y";
        int lygybe=0;
        printf("Ar tikrai norite iseiti is programos?\n");
        printf("Jei taip, spauskite y\n");
        printf("Jei ne, spauskite n\n");
        scanf("%c", &p);


        lygybe=strcmp(p, y);
        if(lygybe==0)
            exit(0);
        else
            goto START;
    }

---

> lygybe=strcmp(p, y);
If your compiler isn't complaining about this, get a better compiler.

If it is complaining, but you're choosing to ignore it, then be a better student.

Code:

---

$ gcc bar.c
bar.c: In function ‘main’:
bar.c:64:19: warning: initialization of ‘char’ from ‘char *’ makes integer from pointer without a cast [-Wint-conversion]
  64 |        char p, y="y";
      |                  ^~~
bar.c:72:23: warning: passing argument 1 of ‘strcmp’ makes pointer from integer without a cast [-Wint-conversion]
  72 |        lygybe=strcmp(p, y);
      |                      ^
      |                      |
      |                      char
bar.c:72:26: warning: passing argument 2 of ‘strcmp’ makes pointer from integer without a cast [-Wint-conversion]
  72 |        lygybe=strcmp(p, y);
      |                          ^
      |                          |
      |                          char

---

Since you're only inputting a single character, do this.

Code:

---

        char p, y='y'; // note single quotes for single letters assigned to char
        int lygybe=0;
        printf("Ar tikrai norite iseiti is programos?\n");
        printf("Jei taip, spauskite y\n");
        printf("Jei ne, spauskite n\n");
        scanf(" %c", &p); // NOTE!! single space before %c

        if ( p == y )

---

The space in the %c format is important, it makes sure you read the next visible character.

> #include <conio.h>
> #include <windows.h>
You don't need either of these for console programs.


Another point, backward goto jumps should really be replaced with a while loop.

Thank you very much, and my compiler doesn't say anything:D
But I will try to be...