Merge pull request #106 from sarthakw7/sarth

C Program to Reverse a String using Pointer

Author: harshareddy794

C/reverse_string.c

@@ -0,0 +1,45 @@
+#include <stdio.h>
+
+int main()
+{
+    char str[100];
+    char rev[100];
+    char *sptr = str;  //base address of string
+    char *rptr = rev;  //base address of reverse
+
+    int i = -1;
+
+    printf("Enter a String: \n");
+    scanf("%s", str);
+
+    // store the ending address of str in sptr
+    while (*sptr)
+    {
+        sptr++;
+        i++;
+    }
+
+    // store the string str in rev in reverse order
+    while (i >= 0)
+    {
+        sptr--;
+        *rptr = *sptr;
+        rptr++;
+        i--;
+    }
+
+    *rptr = '\0';
+    rptr = rev; // restoring the base address of the reverse string
+
+    // storing the reverse string in the original string
+    while (*rptr)
+    {
+        *sptr = *rptr;
+        sptr++;
+        rptr++;
+    }
+
+    // priting the reverse string
+    printf("Reverse of the string is :\n%s", str);
+    return 0;
+}