what is wrong with compiling error

[abrown07]

When i try to compile:

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


/* Function Headers*/
double gravityFactor(double mass, double radius);
double escapeVelocity(double mass, double radius);

    
int main(void)
{
     double mass, radius, gf, ev;
     int unit;
     
     double mass_pl[] = {3.3022e23, 4.8685e24, 5.9736e24, 7.3477e22, 6.4185e23,1.8986e27, 5.6846e26,
                        8.6810e25, 1.0243e26};
     double rad_pl[] = {2439700, 6051800, 6371000, 1737100, 3396200, 71492000, 60268000, 25559000, 
                       24764000};     

      do
      {
          printf("Select 1 for escape velocities and gravity factors.Select 2 to input own values: ");
          scanf("%d", &unit);
      }while((unit>2)||(unit<1)); 


      																									
      
          if(unit==1)  
          {
      
         
         	  printf("Stellar Body     Gravity Factor    Escape Velocity  \n");
         	  gf=((mass_pl[0]/mass_pl[2])/((rad_pl[0]/rad_pl[2])*(rad_pl[0]/rad_pl[2])));
         	  ev =(sqrt((2*(6.67428e-11)*mass_pl[0])/rad_pl[0]))/1000; 
         	  printf(" Mercury:          %.3f               %.1f km/s\n", gf,ev);
         
         	  gf=((mass_pl[1]/mass_pl[2])/((rad_pl[1]/rad_pl[2])*(rad_pl[1]/rad_pl[2])));
         	  ev =(sqrt((2*(6.67428e-11)*mass_pl[1])/rad_pl[1]))/1000;
        	  printf(" Venus:            %.3f               %.1f km/s\n", gf,ev);
         
         	  gf=((mass_pl[2]/mass_pl[2])/((rad_pl[2]/rad_pl[2])*(rad_pl[2]/rad_pl[2])));
         	  ev =(sqrt((2*(6.67428e-11)*mass_pl[2])/rad_pl[2]))/1000; 
         	  printf(" Earth:            %.3f               %.1f km/s\n", gf,ev);
         
         	  gf=((mass_pl[3]/mass_pl[2])/((rad_pl[3]/rad_pl[2])*(rad_pl[3]/rad_pl[2])));
         	  ev =(sqrt((2*(6.67428e-11)*mass_pl[3])/rad_pl[3]))/1000; 
         	  printf(" Moon:             %.3f               %.1f km/s\n", gf,ev);
         
         	  gf=((mass_pl[4]/mass_pl[2])/((rad_pl[4]/rad_pl[2])*(rad_pl[4]/rad_pl[2])));
         	  ev =(sqrt((2*(6.67428e-11)*mass_pl[4])/rad_pl[4]))/1000; 
        	  printf(" Mars:             %.3f               %.1f km/s\n", gf,ev);
         
         	  gf=((mass_pl[5]/mass_pl[2])/((rad_pl[5]/rad_pl[2])*(rad_pl[5]/rad_pl[2])));
         	  ev =(sqrt((2*(6.67428e-11)*mass_pl[5])/rad_pl[5]))/1000; 
         	  printf(" Jupiter:          %.3f               %.1f km/s\n", gf,ev);
         
         	  gf=((mass_pl[6]/mass_pl[2])/((rad_pl[6]/rad_pl[2])*(rad_pl[6]/rad_pl[2])));
         	  ev =(sqrt((2*(6.67428e-11)*mass_pl[6])/rad_pl[6]))/1000; 
         	  printf(" Saturn:           %.3f               %.1f km/s\n", gf,ev);
         
         	  gf=((mass_pl[7]/mass_pl[2])/((rad_pl[7]/rad_pl[2])*(rad_pl[7]/rad_pl[2])));
              ev =(sqrt((2*(6.67428e-11)*mass_pl[7])/rad_pl[7]))/1000; 
         	  printf(" Uranus:           %.3f               %.1f km/s\n", gf,ev);
         
         	  gf=((mass_pl[8]/mass_pl[2])/((rad_pl[8]/rad_pl[2])*(rad_pl[8]/rad_pl[2])));
         	  ev =(sqrt((2*(6.67428e-11)*mass_pl[8])/rad_pl[8]))/1000; 
         	  printf(" Neptune:          %.3f               %.1f km/s\n", gf,ev);
         
                   
      }   
          	  else if(unit==2)
          	  {
             	
              	  do
              	  {
                  	  printf("Please input the mass of your stellar body(In format:1.9891e30): ");
                  	  scanf("%lf", &mass);
                                                    
                  	  printf("Please indicate the radius of your stellar body(In format:1234567): ");
                  	  scanf("%lf",&radius);
                   
                  	  gravityFactor(mass, radius); 
                                   
                  	  escapeVelocity(mass, radius);
                                   
                  	  printf("Please select 1 to calculate another planet. Press any number key to terminate: ");
                	  scanf("%d", &unit);
   
             	  }while(unit==1);
        	  }
  
  return 0;
  
  
}

double gravityFactor(double mass, double radius)
{       
   double gf;    
   gf =((mass/5.9736e24)/((radius/6371000)*(radius/6371000)));  
   printf("The gravity factor of this stellar body is: %.2f\n", gf);
   return gf;     
}  


double escapeVelocity(double mass, double radius)
{    
   double ev;     
   ev =(sqrt((2*(6.67428e-11)*mass)/radius))/1000; 
   printf("The escape velocity of this stellar body is: %.2f km/s\n", ev);
   return ev;    
}

i get an error saying that the sqrt is not defined. I am usiing kate text editor for linux? where is sqrt defined when using linux?

[newb16]

If it's a linker error, use -lm switch to link with math library. Text editor doesn't matter in this case.

[whodgson]

It compiles OK in Dev-C++ and prints the table OK when 1 selected.