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C Exercises: Display the first n terms of Fibonacci series

C For Loop: Exercise-35 with Solution

Write a program in C to display the first n terms of Fibonacci series. The series is as follows:
Fibonacci series 0 1 2 3 5 8 13 .....

Pictorial Presentation:

Display the first n terms of Fibonacci series

Sample Solution:

C Code:

#include <stdio.h>

void main()
{
   int prv=0,pre=1,trm,i,n;
   printf("Input number of terms to  display : ");
   scanf("%d",&n);
   printf("Here is the Fibonacci series upto  to %d terms : \n",n);
   printf("% 5d % 5d", prv,pre);
 
  for(i=3;i<=n;i++)
   {
     trm=prv+pre;
     printf("% 5d",trm);
     prv=pre;
     pre=trm;
   }
   printf("\n");
}

Sample Output: 

Input number of terms to  display : 10                                                                        
Here is the Fibonacci series upto  to 10 terms :                                                              
    0     1    1    2    3    5    8   13   21   34

Flowchart:

Flowchart : Display the first n terms of fibonacci series.

C Programming Code Editor:

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Next: Write a program in C to display the such a pattern for n number of rows using a number which will start with the number 1 and the first and a last number of each row will be 1.

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C Programming: Tips of the Day

Is there a way to specify how many characters of a string to print out using printf()?

The basic way is:

printf ("Here are the first 8 chars: %.8s\n", "A string that is more than 8 chars");

The other, often more useful, way is:

printf ("Here are the first %d chars: %.*s\n", 8, 8, "A string that is more than 8 chars");

Here, you specify the length as an int argument to printf(), which treats the '*' in the format as a request to get the length from an argument.

You can also use the notation:

printf ("Here are the first 8 chars: %*.*s\n",
        8, 8, "A string that is more than 8 chars");

This is also analogous to the "%8.8s" notation, but again allows you to specify the minimum and maximum lengths at runtime - more realistically in a scenario like:

printf("Data: %*.*s Other info: %d\n", minlen, maxlen, string, info);

The POSIX specification for printf() defines these mechanism

Ref : https://bit.ly/3u32GyO