Bisection method in c

#include <stdio.h>
#include <math.h>
double f(double x)
{
    return (x*log10(x))-1.2;
}


int main()
{
    double a,b,e;
    printf("Enter 1st root = ");
    scanf("%lf",&a);
    printf("\nEnter 2nd root = ");
    scanf("%lf",&b);
      printf("\nDefine the input accuracy: = ");
    scanf("%lf",&e);

    
    double x;
    
    if(f(a)*f(b)<=0)  
    {  
        int iter = 1; 
          
        printf (" Iteration \t a \t \tb \t\tx \t\tf(x) \t |a - b| \n ");  
          
        do {  
            x = (a+b) /2.0; 
            printf (" %d \t %lf \t %lf \t %lf \t %lf \t %lf \n", iter, a, b, x, f(x), fabs(a- b));  
            
             if (f(x) == 0)  
            {  
                x = f(x);  
                break; 
            }  
            if (f(a)*f(x)>0)  
            {  
                a = x;  
            }  
            else if (f(a)* f(x) < 0)  
            {  
                b = x;   
            }  
            iter++;   
        }  
        while (fabs(a-b)>=e ); 
         printf (" \nThe root of the given equation is: %lf", x);  
    }  
    else  
    {  
        printf (" \n The root doesn't exist in the given interval. ");  
    }

}