// By muhammad farhan khan 20-02-08

1. include<iostream.h>

1. include<conio.h>

int fact(int f) // f!

{

if(f==0)

return 1;

else

return f*fact(f-1);

}



int fibonacci(int n) // series 1 1 2 3 5 8 13 sum of prev two nos

{ // in func n is the index no.

if(n==1||n==2)

return 1;

else

return fibonacci(n-1)+fibonacci(n-2);

}



double pow(int a,int b) // a^b

{

if(b==1)

return a;

else

return a*pow(a,b-1);

}



int mul(int a,int b) // a*b //farhan production

{

if(b==1)

return a;

else

return a+mul(a,--b);

}



int multiply(int a,int b) // sir rashid production

{

if(b==1)

return a;

else

return a+multiply(a,--b);

}



int add(int a,int b) // a+b //farhan production

{

if(b==1)

return ++a;

else

return 1+add(a,--b);

}



int sum(int a,int b) // sur rashid production

{

if(b==0)

return a;

else

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