diff --git a/.kdev4/LearningC.kdev4 b/.kdev4/LearningC.kdev4
index d3e17e6..39e3f98 100644
--- a/.kdev4/LearningC.kdev4
+++ b/.kdev4/LearningC.kdev4
@@ -15,5 +15,28 @@ Extra Arguments=
 Install Directory=
 Runtime=Host System
 
+[Cppcheck]
+checkPerformance=true
+checkPortability=true
+checkStyle=true
+
+[Launch]
+Launch Configurations=Launch Configuration 0
+
+[Launch][Launch Configuration 0]
+Configured Launch Modes=execute
+Configured Launchers=nativeAppLauncher
+Name=New Compiled Binary Launcher
+Type=Native Application
+
 [Project]
 VersionControlSupport=kdevgit
+
+[SourceFormatter]
+text/x-c++hdr=kdevcustomscript||GNU_indent_GNU
+text/x-c++src=kdevcustomscript||GNU_indent_GNU
+text/x-chdr=kdevcustomscript||GNU_indent_GNU
+text/x-csharp=kdevcustomscript||GNU_indent_GNU
+text/x-csrc=kdevcustomscript||GNU_indent_GNU
+text/x-java=kdevcustomscript||GNU_indent_GNU
+text/x-objcsrc=kdevcustomscript||GNU_indent_GNU
diff --git a/main b/main
deleted file mode 100755
index 48241d1..0000000
Binary files a/main and /dev/null differ
diff --git a/main.c b/main.c
index e269483..8c86e66 100644
--- a/main.c
+++ b/main.c
@@ -1,4 +1,6 @@
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 
 // // PART OF 1-5, 1-15
 // #define LOWER   0
@@ -8,9 +10,11 @@
 // // PART OF 1-15
 // float convert2cels(int fahr);
 
-// // PART OF 1-16, 1-17
-// #define MAXLINE 1000
+// // PART OF 1-16, 1-17, 1-18, 1-19, 1-20
+#define MAXLINE 1000
 // int getlines(char line[], int maxline);
+int detab(char s[],int lim, int col);
+// void reverse(char s[MAXLINE], char d[strlen(s)]);
 // void copy(char to[], char from[]);
 
 int main() {
@@ -191,16 +195,34 @@ int main() {
 //       }
 //     }
 //   }
-//   printf("\"%s\"\n", prostr);
-//   return 0;
-// }
+//   printf("\"%s\"\n", prostr);\
+
+// // 1-19
+//   char d[MAXLINE];
+//   char line[MAXLINE];
+//   int len;
+//   while ((len = getlines(line,MAXLINE)) > 0) {
+//     reverse(line, d);
+//     printf("\nOriginal: %s\nReversed: %s\n", line, d);
+//   }
+
+// // 1-20
+//   int len;
+//   char line[MAXLINE];
+//   while ((len = detab(line,MAXLINE,8)) > 0) {
+//     printf("%s", line);
+//   }
+
+
+  return 0;
+}
 
 // // PART OF 1-15
 // float convert2cels(int fahr) {
 //   return (5.0/9.0) * (fahr-32.0);
 // }
 
-// // PART OF 1-16, 1-17, 1-18
+// // PART OF 1-16, 1-17, 1-18, 1-19
 // int getlines(char s[],int lim) {
 //   int c, i;
 //   for (i=0; i < lim-1 && (c=getchar())!=EOF && c!='\n'; ++i)
@@ -212,6 +234,38 @@ int main() {
 //   s[i] = '\0';
 //   return i;
 // }
+
+// // PART OF 1-20
+// int detab(char s[],int lim, int col)
+// /*s is the string we need to replace, lim is the character limit
+//  * and col is the size of a tab (8 characters usually so we use that)*/
+// {
+//   int c, i; /*c is the character integer representation and i is the column we are on*/
+//   for (i=0; i < lim-1 && (c=getchar())!=EOF && c!='\n';)
+//     if (c == '\t') {
+//       int sp=col-i%col; /*Amount of spaces to replace the tab with*/
+//       int st=i; /*Starting point*/
+//       for (int co = 0; co<=sp; co++ && i++) {
+//         /*For each space we need to add, we increase the column count and add it
+//          *to the array at position (starting point + spaces added so far)
+//          * and we increase the spaces added so far*/
+//         s[st+co] = ' ';
+//       }
+//     } else {
+//       s[i] = c;
+//       ++i;
+//     }
+//   if (c == '\n')
+//     /*If it is the end of the string, represented by a new line,
+//      * add that new line and increase it for the \0 addition*/ {
+//     s[i] = c;
+//     ++i;
+//   }
+//   /*Add the string end and return it to the previous context*/
+//   s[i] = '\0';
+//   return i;
+// }
+
 // /* copy: copy 'from' into 'to'; assume to is big enough */
 // void copy(char to[], char from[]) {
 //   int i;
@@ -219,3 +273,12 @@ int main() {
 //   while ((to[i] = from[i]) != '\0')
 //   ++i;
 // }
+
+// // PART OF 1-19
+// void reverse(char s[MAXLINE], char d[strlen(s)+1]) {
+//   int len = strlen(s);
+//   for (int i=--len; i >= 0; --i) {
+//     d[len-i] = s[i];
+//     d[len+1] = '\0';
+//   }
+// }