Initial commit: C language learning code

翁凯C语言/3/九九乘法表.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <math.h>
+
+int main()
+{
+    int n=9;
+    printf("请输入一个正整数n：");
+    scanf("%d", &n);
+
+    if (n < 1 || n > 9)
+    {
+        printf("输入错误，请重新输入！\n");
+    }
+    else
+    {
+        for (int i = 1; i <= n; i++)
+        {
+            for (int j = 1; j <= i; j++)
+            {
+                printf("%d*%d=%d  ", i, j, i * j);
+                if (i == j)
+                {
+                    printf("\n");
+                }
+            }
+        }
+    }
+    return 0;
+}