prime numbers using squareroot c-basics

Author: kartikgandhi

primenosusinsqrt.c

@@ -0,0 +1,29 @@
+#include<stdio.h>
+#include<math.h>
+void main()
+{
+    int i,a;
+    int k,c=0;
+    printf("Enter number");
+    scanf("%d",&k);
+    for(i=2;i<=a;i++)
+    {
+        a=sqrt(k);
+
+        if(k%i==0)
+        {
+            c++;
+
+        }
+
+    }
+    if(c==0)
+    {
+        printf("prime");
+    }
+    else
+    {
+        printf("not prime");
+    }
+
+}