More on functions – Theory and Programs [Learn to code]

Learn more theory about Functions. And different programs on functions. What is recursion? And programs on recursion.

• 063. Write a program to accept two numbers from user and swap their values using call by reference method in C language

  #include<stdio.h>
  #include<conio.h>  
  #include<process.h>
  
  swap(int *x ,int *y)
  {
  	int temp;
  	temp=*x;
  	*x=*y;
  	*y=temp;
  }
  main()
  {
  	int a,b;
  	clrscr();
  	printf("Enter numbers : ");
  	scanf("%d%d",&a,&b);
          printf("\nBefore Swapping a = %d, b = %d\n",a,b);
  	swap(&a,&b);
  	printf("\nAfter  Swapping a = %d, b = %d\n",a,b);
  	getch();
  }
  
  
  

• 064. Write a program using recursions for fibbonacci series in C language

  
  #include<stdio.h>
  #include<conio.h>  
  #include<process.h>
  fibbo(int pre, int cur ,int x)
  {        int temp;
  	if(x==2)
  	{
  		getch();
  		exit(0);
  	}
  	temp=cur;
  	cur=pre+cur;
  	pre=temp;
  	printf("%d ",cur);
  	fibbo(pre,cur,x-1);
  }
  main()
  {
  	int n,pre=1,cur=1;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	printf("%d %d ",pre,cur);
          fibbo(pre,cur,n);
  	getch();
  }
  
  

• 065. Write a program to print factorial of a given number using recursive function in C language

  #include<stdio.h>
  #include<conio.h>  
  #include<process.h>
  
  int fact(int n)
  {
  	int f;
  	if(n==1)
  		return 1;
  	else
  		f=n*fact(n-1);
  	return f;
  }
  main()
  {
  	int n;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	printf("\nFactorial is...%d\n",fact(n));
  	getch();
  }