C 我的代码的更正和提示

我已经添加、修改了以前的代码。现在我的问题是没有得到正确的布局。我意识到阵列更好。但是有没有办法在没有阵列的情况下修复它呢 文本文件是

test0.txt

，如下所示

3 12867 1.0 2.0 1.0 5.0 4.0 5.0

5156431.024.057.835.050.041.040.4

4186741.0.40.40.40.43.61.03.6

0

代码是：

#include<stdio.h> 
   #include<stdlib.h>
   #include<math.h>
   #define MAX_POINTS 100




 double length(double x1,double x2,double y1,double y2);
 double area_bits(double x1,double x2,double y1,double y2);



int
   main(int argc,char *argv[]){
    int npoints;
    double x_point,y_point;
    double x_prev=0,y_prev=0,x_first=0,y_first=0;
    int poly_id;
    int k,l,m=0;
    
   

 double perimeter=0;
        double area=0;
        int primed=0;
    
/*Error check and echo-control*/
for(;m<=2;m++){
    
    if(m==1){
    printf("Stage 2\n");
    printf("=======\n");
    for(l=1;l<=5;l++){
        printf("+-------");
    }
    printf("+\n");
    printf("|    id |  nval | perim |  area | eccen |\n");
    for(l=1;l<=5;l++){
        printf("+-------");
    }
    printf("+\n");
    }
    if(m==0){
    printf("Stage 1\n");
    printf("======\n");
    }
while(scanf("%d %d",&npoints,&poly_id)==2){
    if(npoints>MAX_POINTS){
        printf("Exceeded limit\n");
        exit(EXIT_FAILURE);
        
    }
        if(m==0){
            printf("First polygon is %d\n",poly_id);
            printf("    x_val    y_val\n");
        
        }
        
            printf("| %5d | %5d |",poly_id,npoints);
        
        perimeter=0;
        area=0;
        for(k=0;k<npoints;k++){
            if (scanf("%lf %lf",&x_point,&y_point)==2){
            if(m==0){
            printf("%8.1f %8.1f\n",x_point,y_point);
            }
            if(k==0){
                x_first=x_point;
                y_first=y_point;
                x_prev=x_point;
                y_prev=y_point;
                
            }
            if(primed){
            perimeter+=(length(x_point,x_prev,y_point,y_prev));
            area+=area_bits(x_point,x_prev,y_point,y_prev);
            x_prev=x_point;
            y_prev=y_point;
        
            }     
            primed=1;
    }
    
}
perimeter+=length(x_first,x_prev,y_first,y_prev);
area+=area_bits(x_first,x_prev,y_first,y_prev);
if(m==0){
printf("perimeter    = %.2f m\n",perimeter);
printf("area         = %.2f m^2\n",area/2);           
printf("eccentricity = %.2f\n",( pow(perimeter,2)/(area/2))/(4*M_PI));
}

printf("%6.2f |%6.2f |%6.2f |\n",perimeter,area/2,( pow(perimeter,2)/(area/2))/(4*M_PI));                                   



}
if(m==1){
for(l=1;l<=5;l++){
        printf("+-------");
    }
    printf("+\n");

}
}
    return 0;
}

double length(double x1,double x2,double y1,double y2){
    return sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
}

double area_bits(double x1,double x2,double y1,double y2){   
    return (x1-x2)*(y1+y2);
}

所需输出：

Stage 1
=======
First polygon is 12867
   x_val   y_val
    1.0     2.0
    1.0     5.0
    4.0     5.0
perimeter    = 10.24 m
area         =  4.50 m^2
eccentricity =  1.86

Stage 2
=======
+-------+-------+-------+-------+-------+
|    id |  nval | perim |  area | eccen |
+-------+-------+-------+-------+-------+
| 12867 |     3 | 10.24 |  4.50 |  1.86 |
| 15643 |     5 | 18.11 | 19.59 |  1.33 |
| 18674 |     4 |  7.60 |  1.92 |  2.39 |
+-------+-------+-------+-------+-------+

  

如有任何更正或提示，我们将不胜感激。请注意，我不是在找人告诉我答案，只是寻求指导

谢谢大家!

两个问题：

1） 您应该在printf中添加某种分隔符（例如“\n”）

2） 您的计数器应为（i=0；i

修改代码：

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

int
main(int argc,char *argv[]){
  int npoints,poly_id;
  double x_point,y_point;
  int i;

  while(scanf("%d %d",&npoints,&poly_id)==2){
    for(i=0; i < npoints; i++){
      scanf("%lf %lf",&x_point,&y_point);
      printf("%f %f\n",x_point,y_point);
    }
    printf("\n");
  }
  return 0;
}

---

再次检查循环条件的

，并尝试计算它实际执行了多少次迭代。您还可以检查内部
scanf
函数返回的内容。对于未使用的参数，将出现两个编译器警告：argc和argv[]建议使用“int main（）”以避免出现问题。您确实编译过这个吗？是否启用了所有编译器警告？第一个问题是变量poly_id在自动变量（堆栈变量）中声明了两次。这一行：'对于（i=0；i作为开始，您的缩进遍布整个shop@EdHeal请暂时忽略这一点好吗？实际上，根据建议的代码，这一输出行“3 12867 1.0 2.0 1.0 5.0 4.0 5.0”将不存在，因为它从未被全部输入或打印过
#include<stdio.h> 
#include<stdlib.h>

int
main(int argc,char *argv[]){
  int npoints,poly_id;
  double x_point,y_point;
  int i;

  while(scanf("%d %d",&npoints,&poly_id)==2){
    for(i=0; i < npoints; i++){
      scanf("%lf %lf",&x_point,&y_point);
      printf("%f %f\n",x_point,y_point);
    }
    printf("\n");
  }
  return 0;
}

3 12867 1.0 2.0 1.0 5.0 4.0 5.0
1.000000 2.000000
1.000000 5.000000
4.000000 5.000000