c++ to find factorial

,

09-array-2.0/01-input-char-array-cin.getline.cpp

@@ -1,60 +1,12 @@
 #include <iostream>
 using namespace std;
-
 int main() {
-   	char a[5]; // contains garbage values
-   	cout<<"A: "<<a<<sizeof(a)/sizeof(char)<<endl;
-
-   	char b[] ={'a', 'b', 'c', 'd', 'e'}; // can end with null or garbage value
-   	cout<<"B: "<<b<<sizeof(b)/sizeof(char)<<endl;
-
-   	char c[] ={'a', 'b', 'c', 'd', 'e', '\0'}; // best practice to add null at end
-   	cout<<"C: "<<c<<sizeof(c)/sizeof(char)<<endl;
-
-   	char d[] = "hello world"; //size+1
-   	cout<<"D: "<<d<<sizeof(d)/sizeof(char)<<endl;
-
-   	// storing char
-   	char e[100];
-   	cin>>e; // it can also read boolean string , without spaces, tab etc.
-   	cout<<"E: "<<e<<sizeof(e)/sizeof(char)<<endl;
-
-   	// strong using cin.getline()
-   	char f[100];
-   	// cin.getline(arr, sizeofarray, delimiter) default delimeter is '\n'
-   	cin.getline(f,100);
-   	cout<<"F: "<<f<<sizeof(f)/sizeof(char)<<endl;;
-
-   	// read pragraph
-   	char par[1000];
-   	cin.get(par, 1000, '.'); // when it finds . then stops, at max 1000 char can be read
-   	cout<<"Par: "<<par<<sizeof(par)/sizeof(char)<<endl;;
-
-    return 0;
+	int num,factorial=1;
+	cout<<" Enter Number To Find Its Factorial:  ";
+	cin>>num;
+	for (int a=1;a<=num;a++) {
+		factorial=factorial*a;
+	}
+	cout<<"Factorial of Given Number is ="<<factorial<<endl;
+	return 0;
 }
-
-
-/*
-
-Input: 
-
-i am from e
-you are from f
-what about
-the paragraph
-you are reading.
-
-Output:
-    
-A: 5
-B: abcde5
-C: abcde6
-D: hello world12
-E: i100
-F:  am from e100
-Par: you are from f
-what about
-the paragraph
-you are reading1000
-
-*/