First version

tests/ide_samples/sum.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+#ifdef __cplusplus
+#error This C file must be compiled as C, not C++.
+#endif
+#if __STDC_VERSION__ < 202311L
+#error C23 is required.
+#endif
+int main(void) {
+    long long a, b;
+    printf("C23 | GCC %s\nInput two integers: ", __VERSION__);
+    fflush(stdout);
+    if (scanf("%lld %lld", &a, &b) != 2) return 1;
+    printf("SUM = %lld\n", a + b);
+    return 0;
+}