#includeint main() { int i=1; long n; int fact=1; printf("please input the number:n"); scanf("%ld",&n); while(i<=n) { fact=fact*i; i++; } printf("%ld!=%ldn",n,fact); return 0; }

#includeint main() { int i=1; long n; int fact=1; printf("please input the number:n"); scanf("%ld",&n); while(i<=n) { fact=fact*i; i++; } printf("%ld!=%ldn",n,fact); return 0; }