i don't know why error coming mentioned in title. data numbers , function reads without problem when tested without pointers.
note: don't need use 'malloc' or other ones. i'm trying figure what's going structure.
#include<stdio.h> #include<stdlib.h> #include<math.h> #include<limits.h> #define max_points 100 #define max_polygons 100 typedef struct{ int polyid; int npoints; double x[max_points]; //stage1 double y[max_points]; double perimeter; double eccentricity; double area; } polygon; typedef struct { polygon npolygon[max_polygons]; }polygons; //function prototypes void process_file(polygons *total_poly); int largestvalue_index(double a[],int m); int largest_poly_id(double a[],int m, int b[]); double area(double x[max_points],double y[max_points],int n); double perimeter(double x[max_points],double y[max_points],int n); double eccentricity(double area,double perimeter); int main(int argc, char *argv[]) { int i,j,k,l; polygons total_poly; process_file(total_poly); printf("stage 1\n"); printf("=====\n"); printf("first polygon %d\n",total_poly->npolygon[0]->polyid); printf("x_val y_val\n"); for(i=0;i<total_poly->npolygon[0].npoints;i++){ printf("%8.2f %8.2f\n",total_poly->npolygon[0]->x[i], total_poly->npolygon[0]->y[i]); } printf("area=%.2f\n",area(total_poly->npolygon[0].x, total_poly->npolygon[0]->y,total_poly->npolygon[0]->npoints)); printf("perimeter=%.2f\n",perimeter(total_poly->npolygon[0]->x, total_poly->npolygon[0]->y,total_poly->npolygon[0]->npoints)); printf("eccentricity=%.2f\n",total_poly->npolygon[0]->eccentricity); //stage2 printf("stage 2"); 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"); for(k=0;k<count;k++){ printf("| %5d | %5d |%6.2f |%6.2f |%6.2f |\n", total_poly->npolygon[k]->polyid,total_poly->npolygon[k]->npoints, total_poly->npolygon[k]->perimeter,total_poly->npolygon[k]->area, total_poly->npolygon[k]->eccentricity); } for(l=1;l<=5;l++){ printf("+-------"); } //stage3 return 0; } void process_file(polygons *total_poly){ int count=0; int i; while(scanf("%d %d",&total_poly.npolygon[count].npoints, &total_poly.npolygon[count].polyid)=2){ for(i=0;i<total_poly.npolygon[count].npoints;i++){ if( scanf("%lf %lf",&total_poly.npolygon[count].x[i], &total_poly.npolygon[count].y[i])=!2) { printf("error"); exit(exit_failure); }else{ scanf("%lf %lf",&total_poly.npolygon[count].x[i], &total_poly.npolygon[count].y[i]); } } count++; } } double area(double x[max_points],double y[max_points],int n){ int i,j; double area=0; j=n-1; for(i=0;i<n;i++){ area+=(x[i]-x[j])*(y[i]+y[j]); j=i; } return 0.5*fabs(area); } double perimeter(double x[max_points],double y[max_points],int n){ int i,j; double length=0; j=n-1; for(i=0;i<n;i++){ length+=fabs(sqrt((x[i]-x[j])*(x[i]-x[j])+(y[i]-y[j])*(y[i]-y[j]))); j=i; } return length; } double eccentricity(double area,double perimeter){ return perimeter*perimeter/area/(4*m_pi); } int largest_poly_id(double a[],int m, int b[]){ int i,j; int poly_index=0,largest = a[0]; for(i=1;i<m;i++){ if(a[i]>largest){ largest=a[i]; poly_index=i; } } j=b[poly_index]; return j; } int largestvalue_index(double a[],int m){ int i; int index=0,largest=a[0]; for(i=1;i<m;i++){ if (a[i]>largest){ largest=a[i]; index=i; } } return index; }
you passing struct process_file function. is, however, expecting pointer struct.
change line:
process_file(total_poly); to this:
process_file(&total_poly); additionally, you'll need change -> operators in printf statements in main function . operators.
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