diff --git a/C/program-55/program.c b/C/program-55/program.c
new file mode 100644
index 00000000..ff134113
--- /dev/null
+++ b/C/program-55/program.c
@@ -0,0 +1,22 @@
+/* Program that prints a number in binary*/
+
+// start writng code from here
+#include <stdio.h>
+
+int main (void)
+{
+  int b;
+  unsigned int mask = 1<<31;
+
+  printf("Input a 32bits integer number: ");
+  scanf("%d", &b);
+
+  while (mask != 0){
+    printf("%d", b&mask?1:0);
+    mask >>= 1;
+  }
+
+  printf("\n");
+
+  return 0;
+}
diff --git a/C/program-55/read.md b/C/program-55/read.md
new file mode 100644
index 00000000..42d8c087
--- /dev/null
+++ b/C/program-55/read.md
@@ -0,0 +1,4 @@
+# program-55
+## Program that prints a number in binary
+
+This program uses bitwise operators to print a 32bits integer in binary representation