Merge branch 'master' into a1012112796-patch-1

Add adder

Add main.c

Signed-off-by: a1012112796 <1012112796@qq.com>

Reviewed-on: https://www.zhao1012112796.top:3000/testg/test_repo/pulls/1

.drone.yml

@@ -0,0 +1,18 @@
+---
+kind: pipeline
+type: docker
+name: build_linux_test
+
+trigger:
+  event:
+    - pull_request
+    - push
+
+steps:
+  - name: build_test
+    image: gcc
+    commands:
+      - echo "start test"
+      - gcc main.c -o test
+      - ./test
+

README.org

@@ -0,0 +1,12 @@
+without latex delimiters the =_{i=1}= in =\sum_{i=1}^n a_n= is interpreted as subscript.
+we support =\(...\)=, =\[...\]=, =$$...$$= and =\begin{$env}...\end{$env}= as latex fragment delimiters.
+
+- \sum_{i=1}^n a_n (without latex delimiter)
+- \(\sum_{i=1}^n a_n\)
+- \[\sum_{i=1}^n a_n\]
+- $$\sum_{i=1}^n a_n$$
+- \begin{xyz}\sum_{i=1}^n a_n\end{xyz}
+- \begin{xyz}
+  \sum_{i=1}^n a_n
+  \end{xyz}
+- $2 + 2$, $3 - 3$

add.c

@@ -0,0 +1,4 @@
+int add(int a, int b)
+{
+    return a + b;
+}

main.c

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+#include <stdio.h>
+
+int add(int a, int b);
+
+int main(int argc, char** argv)
+{
+    int i;
+    printf("hello word!\n");
+    if (argc > 1)
+    {
+        for(i = 0; i < argc; i++)
+        {
+            printf("argv[%2d] = %s\n",i,argv[i]);
+        }
+    }
+    printf("add 1 + 2 = %d \n", add(1,2));
+    return 0;
+}
+
+int add(int a, int b)
+{
+    return a + b;
+}