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64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/*
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Structures allow us to construct a collection or sequence of variables, which can be of any type
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*/
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#include <stdio.h>
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//ask dan
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typedef unsigned char byte;
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//alternative method is wrapping struct in a typedef
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//The compiler doesn't care
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typedef struct Color
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{
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/* data */
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byte Red;
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byte Green;
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byte Blue;
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} Color;
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struct Pixel
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{
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/* data */
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float X;
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float Y;
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Color color;
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};
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typedef struct Pixel Pixel;
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void print_pixel(Pixel p)
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{
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puts("Pixel Location");
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printf("X:%2f, Y:%2f\n", p.X, p.Y);
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puts("Pixel color");
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printf("rgb(%d, %d, %d)\n", p.color.Red, p.color.Green, p.color.Blue);
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}
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int main(int argc, char const *argv[])
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{
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//In C the compiler places structs in a different namespace
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//This requires us to use the struct keyword to have the compiler look up struct definitions
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//like so
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//struct Pixel p;
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//struct Color c;
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// but we can instead introduce the structs via typedefs and leave off the struct keyword
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//Also we can initialize structs with the following
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Color c = {255, 128, 0};
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Pixel p = {10.0f, 20.0f, c};
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// Color c = { 255, 128 }; //Trailing members are zero initialized
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printf("Just so you know you're 3 byte struct for Color will be padded. Padded size in bytes: %d\n", (int)sizeof(Color));
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printf("Size of Pixel: %d\n", (int)sizeof(Pixel));
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//We can access members of structs via dot notation like so
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float x = p.X;
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//We can use assignment to update a member directly
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c.Blue = 255;
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Pixel o = {12.0f, 22.0f, c};
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print_pixel(p);
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print_pixel(p);
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return 0;
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}
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