C Exercises: Check if a number is Mersenne number or not
C Numbers: Exercise-32 with Solution
Write a program in C to Check if a number is Mersenne number or not.
Test DataInput a number: 127
Sample Solution:
C Code:
# include <stdio.h>
# include <stdlib.h>
# include <math.h>
int main()
{
int n,p,ans,i,n1;
double result;
printf("\n\n Check whether a given number is Mersenne number or not:\n");
printf("------------------------------------------------------------\n");
printf(" Input a number: ");
scanf("%d",&n);
n1=n+1;
p = 0;
ans = 0;
for(i=0;;i++)
{
p=(int)pow(2,i);
if(p>n1)
{
break;
}
else if(p==n1)
{
printf(" %d is a Mersenne number.\n",n);
ans=1;
}
}
if(ans==0)
{
printf(" %d is not a Mersenne number.\n",n);
}
}
Sample Output:
Input a number: 127 127 is a Mersenne number.
Pictorial Presentation:
Flowchart:
C Programming Code Editor:
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Previous: 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.
Next: Write a program in C to generate mersenne primes within a range of numbers.
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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
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