tri.c

// tri.c - draw ASCII sirinpinsky triangle, tri-force pattern
// solution to https://boards.4channel.org/g/thread/70748195

#include <stdio.h>

int H = 3;
int T = 2;

/*--- forward declarations for top-down design ---*/

void tri(int N);
void tri_row(int indent, int n, int w);
void tri_line(int h, int n, int w);
void streak(char c, int times);

/*--- top-level function ---*/

void tri(int N) {
    int i, indent;

    for(i = 1; i <= N; i++) {
        indent = (N-i);
        tri_row(indent, i, N);
    }
    return;
}

void tri_row(int indent, int n, int w) {
    int i, j;
    for(j = 1; j <= H; j++) {
        streak(' ', indent*H);
        tri_line(j, n, w);
    }
    return;
}

void tri_line(int h, int n, int w) {
    int i;
    for(i = 1; i <= n; i++) {
        streak(' ', H-h);
        streak('*', h);
        streak('*', h);
        if(h < H) streak(' ', H-h);
    }
    putc('\n', stdout);
    return;
}

void streak(char c, int times) {
    int i;
    for(i = 1; i <= times; i++) putc(c, stdout);
    return;
}

/*--- MAIN ---*/

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

    if(argc > 1) sscanf(argv[1], "%d", &T);
    if(argc > 2) sscanf(argv[2], "%d", &H);

    tri(T);
    return 0;
}