added c program to check for perfect numbers pclubuiet#71

programs/C/perf.c

@@ -0,0 +1,26 @@
+#include<stdio.h>
+
+int main()
+{
+    int sum=0,n;
+     //prompting user for number to check whether it is perfect or not
+    printf("please enter number to check whether it is perfect or not");
+    scanf("%d",&n);
+     //finding sum of divisors of entered number 
+    for(int i=1;i<=n/2;i++)
+    {
+        if(n%i==0)
+        {
+         sum+=i;
+        }
+    }
+        //checking if sum of divisors is equal to entered number or not and then printing required output
+        if(sum==n)
+        {
+            printf("hurray!,entered number is perfect\n");
+        }
+        else
+        printf("number is not perfect, try another one\n");
+
+
+}