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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. typedef struct {
  5. 	size_t rows,cols;
  6. 	double *mat;
  7. } matrix;
  8.  
  9. matrix make(size_t rows,size_t cols)
  10.   {
  11.    matrix m;
  12.    m.rows=rows;
  13.    m.cols=cols;
  14.    m.mat=(double*)malloc(rows*cols*sizeof(double));
  15.    return m;
  16.   }
  17.  
  18. void show(matrix m)
  19.   {
  20.    size_t i,y,x;
  21.    for(i=y=0;y<m.rows;++y,printf("\n")) for(x=0;x<m.cols;++x,++i) printf(" %f"+!x,m.mat[i]);
  22.   }
  23.  
  24. double *ati(matrix m,size_t i)
  25.   {
  26.    return m.mat+i;
  27.   }
  28.  
  29. double *at(matrix m,size_t y,size_t x)
  30.   {
  31.    return ati(m,y*m.cols+x);
  32.   }
  33.  
  34. void drop(matrix m)
  35.   {
  36.    free(m.mat);
  37.   }
  38.  
  39. int main()
  40.   {
  41.    size_t i;
  42.    matrix m1=make(2,5);
  43.    matrix m2=make(3,3);
  44.    for(i=0;i<9;++i) *(ati(m2,i))=i;
  45.    show(m2);
  46.    drop(m2);
  47.    drop(m1);
  48.    return 0;
  49.   }
Success #stdin #stdout 0s 2244KB
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0.000000 1.000000 2.000000
3.000000 4.000000 5.000000
6.000000 7.000000 8.000000


	

		
	 
	
	
			

					
			
			
			
			
			
			
			
			

			
			
			
		

	
		
		

			

			                        







			
			

				

	
					
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language:

						
C (gcc 8.3)

					

					

						
created:
								
						
8 years ago

					

					

						
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