Thread: quadratic equation

Hi. the return values are not coming out properly. Any reasons why would be a big help.

Code:

#include <stdio.h>
#include <stdlib.h>


float b;
float a;
float c;
float z;


int main()
{
    printf("please enter a, b and c \n");
    scanf("%f", &a);
    scanf("%f", &b);
    scanf("%f", &c);


    z= (-b+ sqrt((b*b)-4*a*c))/2*a;
    z= (+b+ sqrt((b*b)-4*a*c))/2*a;
    printf("%f \n");
    printf("%f \n");
}

Missing math.h header. Printf not used properly.

Ok I put the header in and changed the printf but still doesn't work.

Oops Latest code and what is the input you are giving what is the expected and actual output. Can you provide.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
float b;
float a;
float c;
float z;
float r;
int main()
{
    printf("please enter a, b and c \n");
    scanf("%f", &a);
    scanf("%f", &b);
    scanf("%f", &c);
    z= (-b+ sqrt((b*b)-4*a*c))/2*a;
    r= (+b+ sqrt((b*b)-4*a*c))/2*a;
    printf("%f \n",z);
    printf("%f \n",r);
}

Make sure that value in sqrt is positive and 2*a should be in brackets.

Thank you for the help.