Nsryjdtyk

For example, to this program that calculates equations of grade 3, after it calculates the equation, it stops. how do I make it so it loops back again to the start without executing again? I'm still new to this platform so I'll be in your care!

#include < stdio.h >



int main() {

  int a, v, b, c, delt;

  float x1, x2;



  printf("nIntroduceti cele 3 parametrii ecuatia: ");



  scanf("%d %d %d", & a, & b, & c);

  if (a != 0) {

    v = pow(b, 2);

    delt = v - (4 * a * c);



    if (delt >= 0) {



      delt = sqrt(delt);

      x1 = -(b + delt) / (2.0 * a);

      x2 = -(b - delt) / (2.0 * a);



      printf("nValoara lui x1 este: %f", x1);

      printf("n");

      printf("nValoara lui x2 este: %f", x2);



    } else {

      printf("Ecuatia nu are soluti! n");

    }



  } else if (a == 0) {

    printf("nBLACKHOLE");

  }



  return 0;

}

Just wrap your code into an infinite loop (while(1) { /* Your code here*/ }):

#include < stdio.h >



int main() {

  int a, v, b, c, delt;

  float x1, x2;



  while (1) {

    printf("nIntroduceti cele 3 parametrii ecuatia: ");



    scanf("%d %d %d", & a, & b, & c);

    if (a != 0) {

      v = pow(b, 2);

      delt = v - (4 * a * c);



      if (delt >= 0) {



        delt = sqrt(delt);

        x1 = -(b + delt) / (2.0 * a);

        x2 = -(b - delt) / (2.0 * a);



        printf("nValoara lui x1 este: %f", x1);

        printf("n");

        printf("nValoara lui x2 este: %f", x2);



      } else {

        printf("Ecuatia nu are soluti! n");

      }



    } else if (a == 0) {

      printf("nBLACKHOLE");

    }

  }



  return 0;

}

You could wrap everything in a do-while loop and ask the user whether he wants to continue the execution or not, for example:

int a,v,b,c,delt;

float x1,x2;

char choice;

do{

    printf("nIntroduceti cele 3 parametrii ecuatia: ");

    scanf("%d %d %d", &a, &b, &c);

    if(a!=0)

    {

        v=pow(b, 2);

        delt = v-(4*a*c);



        if (delt>=0)

        {

            delt=sqrt(delt);

            x1=-(b+delt)/(2.0*a);

            x2=-(b-delt)/(2.0*a);



            printf("nValoara lui x1 este: %f", x1);

            printf("n");

            printf("nValoara lui x2 este: %f", x2);

        }

        else

        {

            printf("Ecuatia nu are soluti! n");

        }

    }

    else if(a==0)

    {

        printf("nBLACKHOLE");

    }

    printf("nEvaluate new equation?(y/n) ")

    scanf("%c",&choice)

}while(strcmp(choice,"y")==0);



return 0;

The block inside the do{...} will execute at least once, then the user will be asked to input a char (y/n) to decide whether to continue or not.
The strcmp(string1,string2) compares two strings and returns 0 if they are equal, so if the user chose "y", the strcmp will return 0 and the do-while will be executed again.