www.pudn.com > c.rar > recurse.c

/* Demonstrates function recursion. Calculates the */ 
/* factorial of a number. */ 
 
#include  
 
unsigned int f, x; 
unsigned int factorial(unsigned int a); 
 
int main( void ) 
{ 
    puts("Enter an integer value between 1 and 8: "); 
    scanf("%d", &x); 
 
    if( x > 8 || x < 1) 
    { 
        printf("Only values from 1 to 8 are acceptable!"); 
    } 
    else 
    { 
        f = factorial(x); 
        printf("%u factorial equals %u\n", x, f); 
    } 
 
    return 0; 
} 
 
unsigned int factorial(unsigned int a) 
{ 
    if (a == 1) 
        return 1; 
    else 
    { 
        a *= factorial(a-1); 
        return a; 
    } 
}