Pass Struct

Passing a struct by value gives a function its own copy of the fields.

pass_struct.c

#include <stdio.h>

struct Box {
    int width;
    int height;
};

int area(struct Box box) {
    return box.width * box.height;
}

int main(void) {
    int width = ;
    struct Box box = {width, 5};
    int result = area(box);

    printf("area=%d\n", result);
    return 0;
}

#include <stdio.h>

struct Box {
    int width;
    int height;
};

int area(struct Box box) {
    return box.width * box.height;
}

int main(void) {
    int width = ;
    struct Box box = {width, 5};
    int result = area(box);

    printf("area=%d\n", result);
    return 0;
}

#include <stdio.h>

struct Box {
    int width;
    int height;
};

int area(struct Box box) {
    return box.width * box.height;
}

int main(void) {
    int width = ;
    struct Box box = {width, 5};
    int result = area(box);

    printf("area=%d\n", result);
    return 0;
}

by value The function receives a copy of the struct argument.

compute from fields The function can read fields from its copy to compute a result.