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Author: Ashray-debug

fact-og-large-number.cpp

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+#include<iostream> 
+using namespace std; 
+  
+#define MAX 500 
+  
+int multiply(int x, int res[], int res_size); 
+  
+void factorial(int n) 
+{ 
+    int res[MAX]; 
+  
+    res[0] = 1; 
+    int res_size = 1; 
+  
+     for (int x=2; x<=n; x++) 
+        res_size = multiply(x, res, res_size); 
+  
+    cout << "Factorial of given number is \n"; 
+    for (int i=res_size-1; i>=0; i--) 
+        cout << res[i]; 
+} 
+ int multiply(int x, int res[], int res_size) 
+{ 
+    int carry = 0;  // Initialize carry 
+  
+    for (int i=0; i<res_size; i++) 
+    { 
+        int prod = res[i] * x + carry; 
+        res[i] = prod % 10;   
+  
+        carry  = prod/10;     
+    } 
+  
+    while (carry) 
+    { 
+        res[res_size] = carry%10; 
+        carry = carry/10; 
+        res_size++; 
+    } 
+    return res_size; 
+} 
+  
+int main() 
+{ int n;
+cin>>n;
+factorial(n); 
+    return 0; 
+}