diff --git a/README.md b/README.md
index 98ba3380..df158a98 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,7 @@
 | Program-17 | Program to check whether the given number is prefect or not |
 | Program-18 | Program to check given number is Armstrong or not |
 | Program-19 | Program to find power of a given number |
+| Program-20 | Program to convert datatype explicitly |
 | Program-21 | Program to check whether the given number is prime or not |
 | Program-22 | Program to find GCD and LCM of given two number |
 | Program-23 | Program to find number of digits in a given number |
diff --git a/program-20/program.c b/program-20/program.c
index bfe8670d..ed865cda 100644
--- a/program-20/program.c
+++ b/program-20/program.c
@@ -1,8 +1,20 @@
-#include<stdio.h>
-void main()
-{
-if(printf("hello world\n"))
-{
+#include <stdio.h>
+#include <stdlib.h>
 
-}
+int main()
+{ int a=7,b=2;
+   // printf("enter two number !\n");
+    //scanf("%d%d",&a,&b);
+    printf("%d",a/b);
+
+    printf("%d\n",(float)a/b);
+    printf("%d\n",(float)a/(float)b);
+    printf("%d\n",a/(float)b);
+
+    printf("%f\n",a/b);
+    printf("%f\n",(float)(a/b));
+    printf("%f\n",(float) a/b);
+    printf("%f\n",(float)a/(float)b);
+    printf("%f\n",a/(float)b);
+    return 0;
 }