c - 结构变量打印

Question

我正在编写一个遗传算法，但在打印一些结构变量时遇到了问题。我知道代码可以正确读取它们，因为我得到了一个结果，但是当我尝试在屏幕上或文件中打印它们时，结果为零..

这是我正在使用的代码，你能帮帮我吗...？？

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

#define POPSIZE 50
#define MAXGENS 1000
#define NVARS 3
#define PXOVER 0.8
#define PMUTATION 0.15
#define B 2
#define TOURNAMENT_SIZE 2
#define TRUE 1
#define FALSE 0

int generation ;
int cur_best;
FILE *galog_tournament;

struct genotype
{
    double gene[NVARS];
    double fitness;
    double upper[NVARS];
    double lower[NVARS];
    double cfitness;
    double rfitness;
};

struct genotype population[POPSIZE+1];
struct genotype newpopulation[POPSIZE+1];


void initialize(void);
double randval(double,double);
void evaluate(void);
void keep_the_best(void);
void elitist(void);
void tournament_selection(void);
void crossover(void);
void random_Xover(int,int);
void swap(double *,double *);
void non_uniform_mutation(void);
void report(void);
double delta2(int,int);


void initialize(void)
{
    FILE *infile;
    FILE *bounds;
    FILE *popu;
    int i,j;
    double lbound,ubound;

    bounds = fopen("bounds.txt","w");
    popu = fopen("population.txt","w");


    if((infile = fopen("gadata.txt","r"))== NULL)
    {
        fprintf(galog_tournament,"\n Cannot open input file\n");
        exit(1);
    }


    for(i = 0; i < NVARS; i++)
    {
        fscanf(infile, "%lf",&lbound);
        fscanf(infile, "%lf",&ubound);

        printf("%lf  %lf\n",lbound,ubound);

        for(j = 0; j < NVARS; j++)
            {
                population[j].fitness = 0;
                population[j].rfitness = 0;
                population[j].cfitness = 0;
                population[j].lower[i] = lbound;
                population[j].upper[i] = ubound;

                fprintf(bounds,"%lf  %lf\n",&population[j].lower[i],&population[j].upper[i]);

                population[j].gene[i] = randval(population[j].lower[i],population[j].upper[i]);

                fprintf(popu,"%lf\n",population[j].gene[i]);
            }

    }
    fclose(infile);
    fclose(bounds);
    fclose(popu);
}

伙计们，非常感谢你们的帮助，实际上我尝试调试代码并稍微更改它，以便在屏幕上打印值。不幸的是，我仍然得到零...!!这是代码和我的带有下限和上限的输入文件

void initialize(void)
{
    FILE *infile;
    FILE *test;
    int i,j;
    double lbound,ubound;

    test = fopen("test.txt","w");



    if((infile = fopen("gadata.txt","r"))== NULL)
    {
        fprintf(galog_tournament,"\n Cannot open input file\n");
        exit(1);
    }


    for(i = 0; i < NVARS; i++)
    {
        fscanf(infile, "%lf",&lbound);
        fscanf(infile, "%lf",&ubound);

         printf("%lf  %lf\n",lbound,ubound);


    for (j=0; j < POPSIZE; j++) {
        population[j].fitness = 0;
        population[j].rfitness = 0;
        population[j].cfitness = 0;
        population[j].lower[i] = lbound;
        population[j].upper[i] = ubound;
        population[j].gene[i] = randval(population[j].lower[i],
                                        population[j].upper[i]);






     }


  }

    fclose(infile);
    fclose(test);

}






   0.000000 0.000000
    0.000514    0.010514
    0.011307    0.021307
    0.021876    0.031876
    0.033994    0.043994
    0.043272    0.053272
    0.050229    0.060229
    0.053976    0.063976
    0.053803    0.063803
    0.046640    0.056640
    0.029907    0.039907
    0.017619    0.027619
    0.002316    0.012316
    -0.005428   0.004572
    -0.00683    0.00317
    -0.009743   0.000257
    -0.10582    -0.09582
    -0.026304   -0.016304
    -0.027064   -0.017064
    -0.025243   -0.015243
    -0.022386   -0.012386
    -0.019108   -0.009108
    -0.015788   -0.005788
    -0.012185   -0.002185
    -0.009452   0.000548
    -0.052133   0.002867
    -0.006128   0.003872
    0.000000    0.000000

Answer 1

从

中删除 &

fprintf(bounds,"%lf  %lf\n",&population[j].lower[i],&population[j].upper[i]);

所以它变成了:

fprintf(bounds,"%lf  %lf\n",population[j].lower[i],population[j].upper[i]);

您想打印变量的值而不是该变量的地址。

将您的编译器设置为显示警告，在这种情况下它会告诉您有关问题。