5) Write a program to calculate factorial value of a number. The number is supplied at the command line.

 source file name: FactCmdLine.C

//  This  command line program have  main method which  uses 2 parameters

void main(int a, char *b[])

{

void fact(int); // prototype of function

int n;

//clrscr();

n=atoi(b[1]);

printf("\n given  no :  %d ",n);

//scanf("%d", &n);

fact(n);

getch();

}

void fact(int n)

{

int f=1;

for(;n>0;n--)

f=f*n;

printf("\n Factorial value=%d", f);

}

output: