Ma solution à moi

sapin/zigazou/sapin.c

@@ -0,0 +1,62 @@
+void pcs(int intro, int width, char c) {
+    int j;
+
+    for(j = 0; j < intro; j++) putchar(' ');
+    for(j = 0; j < width; j++) putchar(c);
+    putchar('\n');
+}
+
+void draw(int stair, int width, int maxwidth) {
+    int i;
+    for(i = 0; i < stair + 3; i++, width += 2) {
+        pcs((maxwidth - width)/2, width, '*');
+    }
+}
+
+void draw_pied(int height, int maxwidth) {
+    int i;
+    for(i = 0; i < height; i++) {
+        pcs((maxwidth - height) / 2, height + (height+1)%2, '|');
+    }
+}
+
+void draw_sapin(int height) {
+    int stair, incr, width, maxwidth;
+
+    for(width = 1, incr = 2, stair = 1; stair <= height; stair++) {
+        if((stair+1)%2 == 0) incr+=2;
+        width += incr;
+    }
+    maxwidth = width + height + 2;
+
+    for(width = 1, incr = 2, stair = 1; stair <= height; stair++) {
+        draw(stair, width, maxwidth);
+        if((stair+1)%2 == 0) incr+=2;
+        width += incr;
+    }
+
+    draw_pied(height, maxwidth);
+}
+
+int getint(char *s) {
+    int value = 0;
+    char c;
+
+    while(*s != '\0') {
+        c = *s;
+        if(c < '0' || c > '9') return -1;
+        value = value * 10 + c - '0';
+        s++;
+    }
+    return value;
+}
+
+int main(int argc, char **argv) {
+    int height;
+    if(argc != 2) return 1;
+    height = getint(argv[1]);
+    if (height < 1) return 2;
+    draw_sapin(height);
+    return 0;
+}
+