THERE ARE THREE DIFFERENT METHODS FOR SOLVING FACTORIAL PROBLEM WHICH ARE AS FOLLOWS—–
METHOD NO-1–>
# include <stdio.h>
int main()
{
int c, n, fact = 1;
printf("PleasevEnter a number to calculate factorialn");
scanf("%d", &n);
for (c = 1; c <= n; c++)
fact = fact * c;
printf("Factorial of %d = %dn", n, fact);
return 0;
}
METHOD NO-2-->
#include <stdio.h>
long factorial(int);
int main()
{
int number;
long fact = 1;
printf("Please Enter a number to calculate factorialn");
scanf("%d", &number);
printf("%d! = %ldn", number, factorial(number));
return 0;
}
long factorial(int n)
{
int c;
long result = 1;
for (c = 1; c <= n; c++)
result = result * c;
return result;
}
METHOD NO-3-->
#include<stdio.h>
long factorial(int);
int main()
{
int n;
long f;
printf("Please Enter an integer to find factorialn");
scanf("%d", &n);
if (n < 0)
printf("Negative integers are not allowed.n");
else
{
f = factorial(n);
printf("%d! = %ldn", n, f);
}
return 0;
}
long factorial(int n)
{
if (n == 0)
return 1;
else
return(n * factorial(n-1));
}
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