diff --git a/3.c b/3.c
new file mode 100644
index 00000000..c2b8cb75
--- /dev/null
+++ b/3.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    long int digits[50];
+
+    digits[49] = 123.456;
+
+    printf("Values of X\n");
+    int x;
+    for (x=0; x<100; x++){
+        printf(" %d\t",x);
+    } /*final value of x is 99*/
+
+    printf("\n\nValues of ctr\n");
+    int ctr;
+    for (ctr=2; ctr<10; ctr+=3){
+        printf(" %d\t",ctr);
+    } /*final value of ctr is 8*/
+
+    printf("\n\nCounting from 1 to 100\n");
+    int count=1;
+    while(count<=100){
+        printf(" %d\t",count);
+        count +=3 ;
+    }
+
+    /* for (counter = 1; counter < MAXVALUES; counter ++);
+    printf("\n Counter = %d", counter); */
+
+    /* Problems in the above code are; MAXVALUES not declared to a specific data type,
+    counter not declared an integer, curly braces not used after the 'for' condition,
+    and the 'for loop' was wrongly terminated before printf statement.*/
+
+
+    return 0;
+}
+
diff --git a/4.c b/4.c
new file mode 100644
index 00000000..98d84e05
--- /dev/null
+++ b/4.c
@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <math.h>
+#include <string.h>
+
+
+void addarrays(int arrayone[5],int arraytwo[5]){
+        int i;
+        int sum[5];
+        printf("\nTotal arrays\n");
+        for(i=0;i<5;i++){
+        sum[i] = arrayone[i] + arraytwo[i];
+        printf(" %d\t",sum[i]);
+        }
+        return;
+}
+int main()
+{
+    int m;
+    int arrayA[5] = {23,24,31,40,5};
+    int arrayB[5] = {21,22,23,24,25};
+    printf("first array\n");
+    for(m=0;m<5;m++){
+        printf(" %d\t",arrayA[m]);
+    }
+     printf("\nsecond array\n");
+     for(m=0;m<5;m++){
+        printf(" %d\t",arrayB[m]);
+    }
+
+     addarrays(arrayA,arrayB);
+
+     return 0;
+}
+
+
diff --git a/do_it.h b/do_it.h
new file mode 100644
index 00000000..d462baf8
--- /dev/null
+++ b/do_it.h
@@ -0,0 +1,6 @@
+#ifndef DO_IT_H
+#define DO_IT_H
+
+float DO_IT_H(char x,char y,char z);
+
+#endif // DO_IT_H
diff --git a/doit.h b/doit.h
new file mode 100644
index 00000000..d3f5a12f
--- /dev/null
+++ b/doit.h
@@ -0,0 +1 @@
+
diff --git a/done.h b/done.h
new file mode 100644
index 00000000..59372d07
--- /dev/null
+++ b/done.h
@@ -0,0 +1 @@
+#define AGE 20
diff --git a/main.c b/main.c
index d923aa60..03d8c24d 100644
--- a/main.c
+++ b/main.c
@@ -1,15 +1,31 @@
-#include <ctype.h>
-#include <stdio.h>
-
-main(){
-    char some_string[] = {};
-    for (int i = 0; i < 20; ++i) {
-        scanf("%s", some_string);
-        if (some_string[i] == EOF)
-        {
-            break;
-        }
-    }
-    putchar(some_string);
-
-}
\ No newline at end of file
+#include <stdio.h>
+#include <stdlib.h>
+#include <do_it.h>
+#include <print_a_number.h>
+
+int main()
+{
+
+    return 0;
+}
+
+/* #include <stdio.h>
+    void print_msg( void );
+
+    main(){
+    print_msg("This is a message to print");
+         return 0;
+    }
+
+    void print_msq( void )
+          {
+              puts("This is a message to print");
+               return 0;
+          } */
+
+ /* Problems in the above program include; (1) the function print_msg() wrongly
+ has a return0 yet it cannot be returning anything, (2)the statement 'void'
+ in the parenthesis of the function print_msg() makes it unable to pass any
+ conditions in it. (3) Also the function print_msg() was misspelled when
+ prototyping. (4) The argument passed through print_msg() is undefined
+  to a specific data type*/
diff --git a/number 1 b/number 1
new file mode 100644
index 00000000..ca1a2b8d
--- /dev/null
+++ b/number 1	
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int x=1;
+main()
+{
+    if (x==1){
+        printf(" x equals 1 ");
+    }
+      else{
+        printf(" x does not equal 1 ");
+      }
+
+    return 0;
+}