Add a C program to check if a number is power of 2

This is writen as a one line-function of course.

CONTRIBUTORS.md

@@ -439,3 +439,8 @@ Name: [Antonio](https://github.com/toluwalope19) </br>
 Place: Nigeria </br>
 Coding Experience: Python and javaScript. </br>
 Email: [email protected] </br>
+
+Name: [Nasser](https://github.com/nasafix-nasser) </br>
+Place: Iran </br>
+Coding Experience: C/C++. </br>
+Email: [email protected] </br>

c/nasafix-nasser_isPowerOf2.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+void is_powerof_2(int x)
+{
+    for(int p = 1; p < x ; p *= 2, printf("%s%s", p == x ? "Yes\n" : "", p > x && x > 1 ? "No\n" : ""));
+}
+
+int main ( int argc, char *argv[] )
+{
+    int value;
+    do {
+        printf("Enter a number > 1: ");
+        scanf("%d", &value);
+    }while(value <= 1);
+    is_powerof_2(value);
+    return EXIT_SUCCESS;
+}