Skip to content

Instantly share code, notes, and snippets.

@Nexuapex Nexuapex/7segment.c
Created Oct 29, 2011

Embed
What would you like to do?
7-segment display in 50 lines of C99.
#include <stdio.h>
int const schematic[7][7] = {
{0,1,1,1,1,0,0},
{2,0,0,0,0,3,0},
{2,0,0,0,0,3,0},
{0,4,4,4,4,0,0},
{5,0,0,0,0,6,0},
{5,0,0,0,0,6,0},
{0,7,7,7,7,0,0},
};
#define seg(i) (1<<(i))
int const digits[10] = {
/* 0 */ seg(1) | seg(2) | seg(3) | seg(5) | seg(6) | seg(7),
/* 1 */ seg(3) | seg(6),
/* 2 */ seg(1) | seg(3) | seg(4) | seg(5) | seg(7),
/* 3 */ seg(1) | seg(3) | seg(4) | seg(6) | seg(7),
/* 4 */ seg(2) | seg(3) | seg(4) | seg(6),
/* 5 */ seg(1) | seg(2) | seg(4) | seg(6) | seg(7),
/* 6 */ seg(1) | seg(2) | seg(4) | seg(5) | seg(6) | seg(7),
/* 7 */ seg(1) | seg(3) | seg(6),
/* 8 */ seg(1) | seg(2) | seg(3) | seg(4) | seg(5) | seg(6) | seg(7),
/* 9 */ seg(1) | seg(2) | seg(3) | seg(4) | seg(6)
};
void segmentize_print(int digit, int row)
{
if (digit >= 0 && digit <= 10)
for (int col = 0; col < 7; ++col)
putchar((seg(schematic[row][col]) & digits[digit]) ? 'X' : ' ');
}
void segmentize(char const* number)
{
for (int row = 0; row < 7; ++row)
{
char const* it = number;
while (*it) segmentize_print(*it++ - '0', row);
putchar('\n');
}
}
int main(int argc, char const* argv[])
{
if (argc > 1) segmentize(argv[1]);
return 0;
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.