solve it

#include <iostream>
#include <cmath>
#include <algorithm>
using namespace std;

float p,q,r,s,t,u;
float function(float x){
    float resp=p*exp(x*(-1))+q*sin(x)+r*cos(x)+s*tan(x)+t*x*x+u;
    return resp;
}
int main() {
    //printf("%f %f %f %f %f %f",&p,&q,&r,&s,&t,&u)
    //cin>>p>>q>>r>>s>>t>>u;
    while(scanf("%f %f %f %f %f %f",&p,&q,&r,&s,&t,&u)!=EOF){
        float ini=0,fin=1,x,resp,encontrado=0;
        if (   ((function(0)>0) && (function(1)>0))|| ((function(0)<0) && (function(1)<0)) ){
            cout << "No solution" << endl;
            continue;
        }
        for (int i=0;i<50;i++){
            x=(fin+ini)/2;
            if (function(x)<0)
                fin=x;
            else
                ini=x;
        }
        printf("%.4f\n",x);
    }
        return 0;
}