# Factorial of any length

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 Submitted on: 1/3/2015 7:00:00 AM By: Rishab Rana (from psc cd) Level: Beginner User Rating: By 3 Users Compatibility: C, C++ (general), Microsoft Visual C++ Views: 511

Finds the factorial of large numbers.

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 ``` //************************************** // Name: Factorial of any length // Description:Finds the factorial of large numbers. // By: Rishab Rana (from psc cd) // // Assumes:the program find out using simple multiplication the way we do on a paper. 1) find the length of the number so that we can have that big buffer log10 of any number + 1 gives u the length of the number 2) just multplies like we do on paper //************************************** #include #include #include #include void main() { unsigned int d; //number of digits unsigned char *a; unsigned int j, n, q, z, t; int i; double p; cout << "\nEnter the No\t:"; cin >> n; p = 0.0; //calculate the number of digits required for(j = 2; j <= n; j++) p += log10(j); d = (int)p + 1; a = (unsigned char*)malloc(d*sizeof(unsigned char)); if (!a) { cout << "Could not allocate memory!!!"; exit(0); } for (i = 1; i < d; i++) a[i] = 0; //initialize a[0] = 1; p = 0.0; for (j = 2; j <= n; j++) { q = 0; //initialize remainder to be 0 p += log10(j); z = (int)p + 1; for (i = 0; i <= z/*NUMDIGITS*/; i++) { t = (a[i] * j) + q; q = (t / 10); a[i] = (char)(t % 10); } } cout << "\nThe Factorial is\n"; // the fact is stored ulta.. for( i = d -1; i >= 0; i--) { cout << (int)a[i]; } }```

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