How to create a struct on the stack in C?

The same way you declare any variable on the stack:

struct my_struct {...};int main(int argc, char **argv){    struct my_struct my_variable;     // Declare struct on stack    .    .    .}

To declare a struct on the stack simply declare it as a normal / non-pointer value

typedef struct {   int field1;  int field2;} C;void foo() {   C local;  local.field1 = 42;}

an answer to 17.4 Extra Credit (in Zed's book "Learn C the Hard Way") using functions

#include <stdio.h>struct Person {        char *name;        int age;        int height;        int weight;};struct Person Person_create(char *name, int age, int height, int weight){        struct Person who;        who.name = name;        who.age = age;        who.height = height;        who.weight = weight;        return who;}void Person_print(struct Person who){        printf("Name: %s\n", who.name);        printf("\tAge: %d\n", who.age);        printf("\tHeight: %d\n", who.height);        printf("\tWeight: %d\n", who.weight);}int main(int argc, char *argv[]){        // make two people structures         struct Person joe = Person_create("Joe Alex", 32, 64, 140);        struct Person frank = Person_create("Frank Blank", 20, 72, 180);        //print them out and where they are in memory        printf("Joe is at memory location %p:\n", &joe);        Person_print(joe);        printf("Frank is at memory location %p:\n", &frank);        Person_print(frank);        // make everyone age 20 and print them again        joe.age += 20;        joe.height -= 2;        joe.weight += 40;        Person_print(joe);        frank.age += 20;        frank.weight += 20;        Person_print(frank);        return 0;}