#include<stdio.h>

#include<math.h>

double g=9.8, mk, v0, gmk;

//定义公式（8）中的f(x）=0

double f(double theta){

    return .....;

}

//solve f(x)=0 by bi-section method

double solve_f_bisection(double xl, double xh, double err) {

        ......       

        return  ...;

}

// or solve f(x)=0 by iteration method

double solve_f_iteration(double x0 ,  double err) {

        ......       

        return  ...;

}

int main(){

    printf("input mk, v0 :");

    scanf("%lf%lf",&mk,&v0);

    gmk = g*mk;

    double theta = solve_f_bisection(....);

     // 或者 double theta = solve_f_iteration(.....);

     //打印输出theta, 及最大射程

    return 0;

}