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fibonacci number or not in C


Here we written code for to check whether the given number is in belongs to Fibonacci series or not.

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Task: Write a C program to print nth term in Fibonacci series.

Write a C program to check the given integer is Fibonacci number or not.

void main()
  int f,s,t,n,i,flg; //’f’ is 1st num,’s’ is 2nd num,’t’ for 3rd new generated num, ‘n’ is user defined, ‘i’ is for iteratons, “flg” is Flag variable.
  printf(“Enter a number : “);
  scanf(“%d”,&n); //Read the number.
    printf(“Please enter a valid number\n”);
  f=flg=t=0; //set f,flg and t variables set as zero for check conditions.
    flg=1; //set flg variable as ‘1’ for founding the integer in series.
    s=1; //set ‘s’ variable as ‘1’ to generate next numbers of series.
      t=f+s; //Generating next number in the series by adding preceding two intigers.
      s=t; //Shifting the last two terms of series to ‘f’ & ‘s’ for genarating next number in the series.
  printf(“Given integer is a Fibanacci number.\n”);
  printf(“Given integer is Not Fibanacci number.\n”);

i) Enter a number : 610
Given integer is a Fibanacci number.

ii) Enter a number : 812
Given integer is Not Fibanacci number.

Back to the programs.

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