C Exercises: Display first 10 Fermat numbers

Last update on May 27 2022 12:18:17 (UTC/GMT +8 hours)

C Numbers: Exercise-30 with Solution

Write a program in C to display first 10 Fermat numbers.

Sample Solution:

C Code:

# include <stdio.h>
# include <stdlib.h>
# include <math.h>


int main()
{
    int n=0;
	double result;
	printf("\n\n Display first 10 Fermat numbers:\n");
	printf("-------------------------------------\n");
	printf(" The first 10 Fermat numbers are: \n");
while (n <= 10) 
		{
            result= pow(2, pow(2, n)) + 1;
            n++;
            printf("%lf \n",result);
        }
}

Sample Output:

 The first 10 Fermat numbers are:                                                                             
3.000000                                                                                                      
5.000000                                                                                                      
17.000000                                                                                                     
257.000000                                                                                                    
65537.000000                                                                                                  
4294967297.000000                                                                                             
18446744073709551616.000000                                                                                   
340282366920938463463374607431768211456.000000                                                                
115792089237316195423570985008687907853269984665640564039457584007913129639936.000000                         
13407807929942597099574024998205846127479365820592393377723561443721764030073546976801874298166903427690031858
186486050853753882811946569946433649006084096.000000                                                          
inf

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C programming: Display first 10 Fermat numbers.

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Next: Write a program in C to find any number between 1 and n that can be expressed as the sum of two cubes in two (or more) different ways.

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C Programming: Tips of the Day

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP