常用c++函数1 example

1.float 转字符串方法 

#include<string.h>
#include<sstream>


stringstream ss;
ss<<angle[i/2]*180/3.141516;
string s =ss.str();

2 传入结构体的数组

#include <iostream>
#include<sstream>
#include <vector>
#include <fstream>
#include<string.h>
#include<algorithm>
using namespace std;

typedef struct nn_output
{
    // double *outbuf;
    double outbuf[2];
    int count;
}output_nn;

int get_output(output_nn ouput2[])
{
    double out_men[2]={7.88,8.99};
    double out_men1[2]={1.88,2.99};

    ouput2[0].count=6;
    for(int i=0;i<2;i++)
    {
        ouput2[i].outbuf[0]=out_men[0];
        ouput2[i].outbuf[1]=out_men[1];
    }
    // ouput2[0].outbuf=out_men; 
    ouput2[1].count=0;
    return 0;
}

int main() 
{   
    output_nn* output3=NULL;
    output3 = (output_nn*)malloc(2 * sizeof(output_nn));