/* File: structs4.c

*

* Purpose: Illustrate pass by reference of structs using second solution

* to problem of passing struct args -- using typedef

* Input: None

* Output: struct member values

*

* Compile: gcc -g -Wall -o structs4 structs4.c

* Usage: ./structs4

*

* Note: This program has a few bugs . . .

*/

#include <stdio.h>

typedef struct {

double value;

int row;

int col;

} element_t;

void pass_struct(element_t* x_p);

int main(void) {

element_t element;

element.value = 5.5;

element.row = 6;

element.col = 10;

printf("element.value = %f\n", element.value);

printf("element.row = %d\n", element.row);

printf("element.col = %d\n", element.col);

pass_struct(&element);

printf("\nelement.value = %f\n", element.value);

printf("element.row = %d\n", element.row);

printf("element.col = %d\n", element.col);

return 0;

} /* main */

void pass_struct(element_t* x_p) {

printf("\nIn pass_struct\n");

printf("x.value = %f\n", (*x_p).value);

printf("x.row = %d\n", (*x_p).row);

printf("x.col = %d\n", (*x_p).col);

*x_p.value = 1.2;

*x_p.row = 10;

*x_p.col = 16;

} /* pass_struct */