CS计算机代考程序代写 #include

#include

/* Allocate memory for a rows*cols array of floats.
* The elements within a column are contiguous in memory, and columns
* themselves are also contiguous in memory.
*/
float **alloc_floatmatrix(int cols, int rows)
{
int i;
float **m;
if ((m = (float**) malloc(cols*sizeof(float*))) == NULL) {
return NULL;
}
float *els = (float *) calloc(rows*cols, sizeof(float));
if (els == NULL) {
return NULL;
}
for (i = 0; i < cols; i++) { m[i] = &els[rows * i]; } return m; } /* Allocate memory for a rows*cols array of chars. */ char **alloc_charmatrix(int cols, int rows) { int i; char **m; if ((m = (char**) malloc(cols*sizeof(char*))) == NULL) { return NULL; } char *els = (char *) malloc(rows*cols*sizeof(char)); if (els == NULL) { return NULL; } for (i = 0; i < cols; i++) { m[i] = &els[rows * i]; } return m; } /* Free the memory of a matrix allocated with alloc_{float|char}matrix*/ void free_matrix(void *m) { void **els = (void **) m; free(els[0]); /* Deallocate the block of array elements */ free(m); /* Deallocate the block of column pointers */ }