added programs

programs/p311/main.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+int main(void) {
+    int a, b;
+
+    printf("Int A: ");
+    scanf("%d", &a);
+    printf("Int B: ");
+    scanf("%d", &b);
+
+    int diff = a - b;
+
+    if (diff >= 11 || diff <= -11) {
+        printf("Difference is greater than or equal to 11.\n");
+    } else {
+        printf("Difference is less than or equal to 10.\n");
+    }
+
+    return 0;
+}