1 files changed, 42 insertions, 0 deletions
diff --git a/algorithms/string_reverse.c b/algorithms/string_reverse.c
new file mode 100644
index 0000000..e6b6988
--- /dev/null
+++ b/algorithms/string_reverse.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <string.h>
+
+
+char * rev(char *s)
+{
+  int l = strlen(s);
+  char res[l+1];
+  int k = 0;
+  for (int i = l-1; i >= 0; i--) { // unsigned not!
+    res[k] = s[i];
+    k++;
+  }
+  res[l] = 0;
+  return res;
+}
+
+void rev_inplace(char *s)
+{
+  char temp;
+  int j = strlen(s)-1;
+  for (int i = 0; i <= j; i++) {
+    temp = s[i];
+    s[i] = s[j];
+    s[j] = temp;
+    j--;
+  }
+}
+
+
+int main(void)
+{
+  char *s = "Asdf"; 
+  printf("%s\n", s);
+  char *r = rev(s);
+  printf("%s\n", r);
+  char t[] = "fdsA"; 
+  rev_inplace(t);
+  printf("%s\n", t);
+  return 0;
+}
+