lcthw/ex35.c at master · AliNisarAhmed/lcthw

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#include <stdio.h>

typedef enum {

TYPE_INT,

TYPE_FLOAT,

TYPE_STRING,

} VariantType;

struct Variant {

VariantType type;

union {

int as_integer;

float as_float;

char *as_string;

} data;

};

typedef struct Variant Variant;

void Variant_print(Variant *var) {

switch (var->type) {

case TYPE_INT:

printf("INT: %d\n", var->data.as_integer);

break;

case TYPE_FLOAT:

printf("FLOAT: %f\n", var->data.as_float);

break;

case TYPE_STRING:

printf("STRING: %s\n", var->data.as_string);

break;

default:

printf("UNKNOWN TYPE: %d", var->type);

}

int main(int argc, char *argv[]) {

Variant a_int = {.type = TYPE_INT, .data.as_integer = 100};

Variant a_float = {.type = TYPE_FLOAT, .data.as_float = 100.32};

Variant a_string = {.type = TYPE_STRING, .data.as_string = "YO Dude!"};

Variant_print(&a_int);

Variant_print(&a_float);

Variant_print(&a_string);

a_int.data.as_integer = 200;

a_float.data.as_float = 2.345;

a_string.data.as_string = "Hi there!";

Variant_print(&a_int);

Variant_print(&a_float);

Variant_print(&a_string);

return 0;

}

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