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//program to create a function to find factorial of number passed to function as argument #include<iostream.h> void factorial(int); //function declaration void factorial(int a) //function definition { int fact=1; int i; for(i=1;i<=a;i++) { fact=fact*i; } cout<<"factorial of number is "<<fact; } void main() { int a; clrscr(); cout<<"enter number to find factorial for "; cin>>a; factorial(a); //calling the function getch(); }