diff --git a/Conversions/Binary To Decimal.c b/Conversions/Binary To Decimal.c
deleted file mode 100644
index 93cb7d3f..00000000
--- a/Conversions/Binary To Decimal.c	
+++ /dev/null
@@ -1,17 +0,0 @@
-#include<stdio.h>
-#include<conio.h>
-int main() {
-	int number, decimal_number, temp=1;
-	printf("Enter any binary number= ");
-	scanf("%d", &number);
-    int remainder;
-	while(number>0) {
-	
-		remainder = number%10;
-		number = number/10;
-		decimal_number += remainder*temp;
-		temp = temp*2;//used as power of 2
-	
-	}
-	printf("%d",decimal_number);
-}
diff --git a/conversions/decimal2Binary.c b/conversions/decimal2Binary.c
new file mode 100644
index 00000000..8164fa5c
--- /dev/null
+++ b/conversions/decimal2Binary.c
@@ -0,0 +1,38 @@
+/*********decimal number to binary number conversion*****************/
+#include <stdio.h>
+void decimal2Binary(long num);
+ 
+int main(){
+	
+    long num;
+ 
+    printf("Enter a decimal integer \n");
+    scanf("%ld", &num);
+    decimal2Binary(num);
+
+return 0;
+} 
+
+/***function for convert decimal numbers to binary numbers****************/
+void decimal2Binary(long num){
+
+long  decimal_num, remainder, base, binary, no_of_1s;
+
+base = 1; 
+binary = 0; 
+no_of_1s = 0;
+
+while (num > 0)
+    {
+        remainder = num % 2;
+      
+        if (remainder == 1)
+        {
+            no_of_1s++;
+        }
+        binary = binary + remainder * base;
+        num = num / 2;
+        base = base * 10;}
+        
+    printf("Its binary equivalent is = %ld\n", binary);
+}
diff --git a/conversions/decimal2Hexa.c b/conversions/decimal2Hexa.c
new file mode 100644
index 00000000..079b8183
--- /dev/null
+++ b/conversions/decimal2Hexa.c
@@ -0,0 +1,46 @@
+/*****Decimal to Hexadecimal conversion*******************/
+#include <stdio.h>
+void decimal2Hexadecimal(long num);
+
+ 
+int main(){
+	
+  long decimalnum;
+ 
+  printf("Enter decimal number: ");
+  scanf("%ld", &decimalnum);
+ 
+  decimal2Hexadecimal(decimalnum);
+
+return 0;
+}
+
+/********function for convert decimal number to hexadecimal number****************/
+void decimal2Hexadecimal(long num){
+
+long decimalnum=num;
+long quotient, remainder;
+int i, j = 0;
+char hexadecimalnum[100];
+
+    quotient = decimalnum;
+
+	while (quotient != 0){
+
+        remainder = quotient % 16;
+			if (remainder < 10)
+            hexadecimalnum[j++] = 48 + remainder;
+
+			else
+			hexadecimalnum[j++] = 55 + remainder;
+
+			quotient = quotient / 16;}
+
+    // print the hexadecimal number
+
+    for (i = j; i >= 0; i--){
+            printf("%c", hexadecimalnum[i]);}
+
+	printf("\n");
+}
+
diff --git a/conversions/decimal2Octal.c b/conversions/decimal2Octal.c
new file mode 100644
index 00000000..2cc0d4c0
--- /dev/null
+++ b/conversions/decimal2Octal.c
@@ -0,0 +1,35 @@
+/*****Decimal to octal conversion*******************/
+#include <stdio.h>
+void decimal2Octal(long decimalnum);
+ 
+int main(){
+
+    long decimalnum;
+
+    printf("Enter the decimal number: ");
+	scanf("%ld", &decimalnum);
+    
+    decimal2Octal(decimalnum);
+
+return 0;
+}
+ 
+/********function for convert decimal numbers to octal numbers************/ 
+void decimal2Octal(long decimalnum){
+  long remainder, quotient;
+
+    int octalNumber[100], i = 1, j;
+    quotient = decimalnum;
+
+    while (quotient != 0){
+		octalNumber[i++] = quotient % 8;
+
+        quotient = quotient / 8;
+	}
+
+    for (j = i - 1; j > 0; j--)
+
+        printf("%d", octalNumber[j]);
+
+	printf("\n");
+}