Thread: prototype function sqrt velocity(v)

Code:

question I am trying to computed the time it takes for a projectile to hit the ground. 
 the problem is that i need to square the imput of velocity before i do the calculation. the question I have is that if it's possible to have multiple arguments inside the brakets after main and if it is can someone help me.

#include <stdio.h>
#include <math.h>
double distance (double a, double v, double g);
int square(int y);
double height(double v, double a, double g);
double time (double v, double a, double g);
double sqrt(double num);
int main(void)
{
        double d, h, datha, v, t;
        int velocity, degrees;
        const double pi=3.14159265359; // the value of pi
        const double g= 9.81; // acceleration due to gravity m/s^2
        printf(" enter the angle in degrees");
        scanf("%d", &degrees);
        datha = degrees * pi/180;
        printf("Enter the initial veloity\n");
      
  printf("Enter the initial veloity\n");
        scanf("%lf", &v);
        velocity = square(v);
        d = distance(datha, velocity,g);
        printf("the reange of the projectile was %.2f\n: ", d);
        h = height(datha, velocity, g);
        printf("the maximum height achieveid was:%.2lf: ", h);
        t = time(datha, velocity, g);
        printf(" the time was %.2f", t);
        return 0;
}
int square(int y){
        return pow(y,2);
}
double distance(double a, double v, double g ){
                      return v *sin(2*a)/g;
}
double height(double v, double a, double g){
        return v*sin(a)/g;
}
double time(double v, double a, double g){
        return sqrt v;
        return 2*v*sin(a)/g;
}

this is the error I am getting

âtimeâ:
q1.c:51: error: incompatible types when returning type âdouble (*)(double)â but âdoubleâ was expected
q1.c:51: error: expected â;â before âvâ