Struct Arrays

An array can store several struct values of the same type.

array of structs `scores[index]` selects one struct value from the array.

field after index Use `scores[index].points` to read a field from the selected element.

                            index
                            index = 1 (default)index = 0index = 2
                        

                            struct_arrays.c
                        
Replay: real traced execution (multi-file project)

                            #include <stdio.h>

struct Score {
    int id;
    int points;
};

int main(void) {
    struct Score scores[3] = {{1, 10}, {2, 20}, {3, 30}};
    int index = 1;
    int result = scores[index].points;

    printf("points=%d\n", result);
    return 0;
}
#include <stdio.h>

struct Score {
    int id;
    int points;
};

int main(void) {
    struct Score scores[3] = {{1, 10}, {2, 20}, {3, 30}};
    int index = 0;
    int result = scores[index].points;

    printf("points=%d\n", result);
    return 0;
}
#include <stdio.h>

struct Score {
    int id;
    int points;
};

int main(void) {
    struct Score scores[3] = {{1, 10}, {2, 20}, {3, 30}};
    int index = 2;
    int result = scores[index].points;

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

                        
1scores ← ⟨addr A⟩, index ← 1, result ← 20⋯8int main(void) {9    struct Score scores→ ⟨addr A⟩[3] = {{1, 10}, {2, 20}, {3, 30}};10    int index→ 1 = 1; //@index=0, 211    int result→ 20 = scores[index].points20;1213    printf("points=%d\n", result20);14    return 0;15}⋯outputpoints=20
1scores ← ⟨addr A⟩, index ← 0, result ← 10⋯8int main(void) {9    struct Score scores→ ⟨addr A⟩[3] = {{1, 10}, {2, 20}, {3, 30}};10    int index→ 0 = 0;11    int result→ 10 = scores[index].points10;1213    printf("points=%d\n", result10);14    return 0;15}⋯outputpoints=10
1scores ← ⟨addr A⟩, index ← 2, result ← 30⋯8int main(void) {9    struct Score scores→ ⟨addr A⟩[3] = {{1, 10}, {2, 20}, {3, 30}};10    int index→ 2 = 2;11    int result→ 30 = scores[index].points30;1213    printf("points=%d\n", result30);14    return 0;15}⋯outputpoints=30