barosl · July 26, 2015 07:26 · Jul 26, 2015
diff --git a/add.c b/add.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int addi(int a, int b) {
+    return a + b;
+}
+
+char *adds(char *a, char *b) {
+    char *res = malloc(strlen(a) + strlen(b) + 1);
+    strcpy(res, a);
+    strcat(res, b);
+    return res;
+}
+
+#define add(a, b) _Generic(a, int: addi, char*: adds)(a, b)
+
+int main(void) {
+    int a = 1, b = 2;
+    printf("%d\n", add(a, b)); // 3
+
+    char *c = "hello ", *d = "world";
+    printf("%s\n", add(c, d)); // hello world
+
+    return 0;
+}
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