diff --git a/c_modern_approach/Fundamentials/exercises/2_1 b/c_modern_approach/Fundamentials/exercises/2_1
new file mode 100755
index 0000000..6d97fba
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diff --git a/c_modern_approach/Fundamentials/exercises/2_4 b/c_modern_approach/Fundamentials/exercises/2_4
new file mode 100755
index 0000000..378db81
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diff --git a/c_modern_approach/Fundamentials/exercises/s_2_1.c b/c_modern_approach/Fundamentials/exercises/s_2_1.c
new file mode 100644
index 0000000..971cede
--- /dev/null
+++ b/c_modern_approach/Fundamentials/exercises/s_2_1.c
@@ -0,0 +1,3 @@
+#include <stdio.h>
+
+int main(void) { printf("hello, world\n"); }
diff --git a/c_modern_approach/Fundamentials/exercises/s_2_2.c b/c_modern_approach/Fundamentials/exercises/s_2_2.c
new file mode 100644
index 0000000..e69de29
diff --git a/c_modern_approach/Fundamentials/exercises/s_2_4.c b/c_modern_approach/Fundamentials/exercises/s_2_4.c
new file mode 100644
index 0000000..bf9f28a
--- /dev/null
+++ b/c_modern_approach/Fundamentials/exercises/s_2_4.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+int main(void) {
+  float float_var_1, float_var_2, float_var_3;
+  int int_var;
+  printf("%f\n", float_var_1);
+  printf("%f\n", float_var_2);
+  printf("%f\n", float_var_3);
+  printf("%d", int_var);
+
+  int _100_bottles;
+  int one____hundred_bottles;
+  int bottles_;
+}
diff --git a/c_modern_approach/Fundamentials/exercises/s_2_7.c b/c_modern_approach/Fundamentials/exercises/s_2_7.c
new file mode 100644
index 0000000..e69de29