done

programs/p418/main.c

@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+#define CHARSPERLINE 5
+
+int main(void) {
+    int n;
+
+numInput:
+    printf("Input integer: ");
+    scanf("%d", &n);
+
+    if (n < 1) {
+        puts("Please input non-zero positive integer.");
+        goto numInput;
+    }
+
+    for (int i = 1; i <= n; i++) {
+        putchar('*');
+        if (i % CHARSPERLINE == 0) {
+            putchar('\n');
+        }
+    }
+
+    return 0;
+}