added all c file to raise pull request

big2.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+void biggest2()
+{
+    int num1, num2;
+    // Ask user to enter the two numbers
+    printf("Please Enter Two different values\n");
+    // Read two numbers from the user
+    scanf("%d %d", &num1, &num2);
+    if(num1 > num2)
+    {
+        printf("%d is Largest\n", num1);
+    }
+    else if (num2 > num1)
+    {
+        printf("%d is Largest\n", num2);
+    }
+    else
+    {
+        printf("Both are Equal\n");
+    }
+    //return 0;
+}

factorial.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+void factorial() {
+    int n, i;
+    unsigned long long fact = 1;
+    printf("Enter an integer: ");
+    scanf("%d", &n);
+
+    // shows error if the user enters a negative integer
+    if (n < 0)
+        printf("Error! Factorial of a negative number doesn't exist.");
+    else {
+        for (i = 1; i <= n; ++i) {
+            fact *= i;
+        }
+        printf("Factorial of %d = %llu", n, fact);
+    }
+
+   //return 0;
+}

main.c

@@ -0,0 +1,5 @@
+#include<stdio.h>
+main(){
+	biggest2();
+	factorial();
+}

makefile

@@ -0,0 +1,8 @@
+ABC.exe:main.o big2.o factorial.o
+	gcc -o ABC.exe main.o big2.o factorial.o
+main.o:main.c
+	gcc -c main.c
+big2.o:big2.c
+	gcc -c big2.c
+factorial.o:factorial.c
+	gcc -c factorial.c