Question: It is C language program and the code is given and needs to write and modify a function from matrix c file & main function
It is C language program and the code is given and needs to write and modify a function from matrix c file & main function that the program will print out the extreme values in the standard input stream.
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extreme.c file
#include
#include
#include \"matrix.h\"
int main () {
int num_rows, num_cols;
/* read the number of columns and the number of rows */
if (scanf(\"%d\",&num_cols) != 1) {
printf (\"ERROR: cannot read the number of columns \");
exit(1);
}
if (scanf(\"%d\",&num_rows) != 1) {
printf (\"ERROR: cannot read the number of rows \");
exit(1);
}
/* add code here */
}
-----------------------------------
matrix.c file
#include
#include
#include \"matrix.h\"
/* allocate and initialize to 0 a num_rows x num_cols matrix */
void matrix_init (matrix_type* mat_ptr, int num_rows, int num_cols) {
mat_ptr->num_rows = num_rows;
mat_ptr->num_cols = num_cols;
mat_ptr->data_ptr = (float*) calloc (num_rows*num_cols, sizeof(float));
#ifdef DEBUG
if (mat_ptr->data_ptr == 0) {
printf (\"error in matrix_init : calloc returned 0. \");
exit(1);
}
#endif
}
/* deallocate a matrix and set all entries to 0 */
void matrix_deinit (matrix_type* mat_ptr) {
mat_ptr->num_rows = 0;
mat_ptr->num_cols = 0;
free(mat_ptr->data_ptr);
mat_ptr->data_ptr = 0;
}
/* read a matrix from stdin */
void matrix_read (matrix_type* mat_ptr) {
int count = 0;
float next;
while (scanf(\"%g\",&next) == 1) {
if (count >= mat_ptr->num_rows*mat_ptr->num_cols) {
printf (\"ERROR: stdin contains too many numbers \");
exit(1);
}
mat_ptr->data_ptr[count] = next;
count += 1;
}
if (count num_rows*mat_ptr->num_cols) {
printf (\"ERROR: stdin contains too rew numbers \");
exit(1);
}
}
/* print a matrix to stdout */
void matrix_print (matrix_type* mat_ptr) {
int i;
matrix_row_type row;
printf (\"number of rows = %d \",mat_ptr->num_rows);
printf (\"number of columns = %d \",mat_ptr->num_cols);
for (i=0;inum_rows;i++) {
matrix_get_row (mat_ptr,&row,i);
matrix_row_print (&row);
}
}
/* get a row of a matrix (not a copy just a pointer into the data) */
void matrix_get_row (matrix_type* mat_ptr, matrix_row_type* row_ptr,
int row) {
#ifdef DEBUG
if ((row = mat_ptr->num_rows)) {
printf (\"error in matrix_get_row : row out of range \");
exit(1);
}
#endif
row_ptr->num_cols = mat_ptr->num_cols;
row_ptr->data_ptr = &(mat_ptr->data_ptr[row*mat_ptr->num_cols]);
}
/* print a row of a matrix to stdout */
void matrix_row_print (matrix_row_type* row_ptr) {
int i;
for (i=0;inum_cols;i++) {
printf (\"%g \",row_ptr->data_ptr[i]);
}
printf (\" \");
}
/* calculate the distance squared between two row vectors */
float matrix_row_dist_sq (matrix_row_type* row1_ptr,
matrix_row_type* row2_ptr) {
#ifdef DEBUG
if (row1_ptr->num_cols != row2_ptr->num_cols) {
printf (\"error in matrix_row_dist_sq: number of columns mismatch \");
}
#endif
/* add code here */
}
-----------------------------------------------------
matrix.h file
/* matrix.h */
/* make sure this header file has not been included already */
#ifndef __MATRIX
#define __MATRIX 1
typedef struct matrix_s {
int num_rows;
int num_cols;
float* data_ptr;
} matrix_type;
typedef struct matrix_row_s {
int num_cols;
float* data_ptr;
} matrix_row_type;
/* allocate and initialize to 0 a num_rows x num_cols matrix */
void matrix_init (matrix_type* mat_ptr, int num_rows, int num_cols);
/* deallocate a matrix and set all entries to 0 */
void matrix_deinit (matrix_type* mat_ptr);
/* read a matrix from stdin */
void matrix_read (matrix_type* mat_ptr);
/* print a matrix to stdout */
void matrix_print (matrix_type* mat_ptr);
/* get a row of a matrix (not a copy just a pointer into the data) */
void matrix_get_row (matrix_type* mat_ptr, matrix_row_type* row_ptr,
int row);
/* print a row of a matrix to stdout */
void matrix_row_print (matrix_row_type* row_ptr);
/* calculate the distance squared between two row vectors */
float matrix_row_dist_sq (matrix_row_type* row1_ptr,
matrix_row_type* row2_ptr);
#endif
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Please modify main function and matrix row dist sqr function.
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