Q:

# Write a program in C to generate mersenne primes within a range of numbers

Write a program in C to generate mersenne primes within a range of numbers

`Expected Output:Input a upper limit [range from 1 to upper limit]: 1000Mersenne prime numbers are:3 7 31 127`

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

void GenAllPrim(int n1, bool prarr1[])
{
for (int i=0; i<=n1; i++)
prarr1[i] = true;

for (int p=2; p*p<=n1; p++)
{
if (prarr1[p] == true)
{
for (int i=p*2; i<=n1; i += p)
prarr1[i] = false;
}
}
}
void chkMerPrime(int nm)
{
bool prarr1[nm+1];
GenAllPrim(nm,prarr1);
for (int j=2; ((1<<j)-1) <= nm; j++)
{
long long num = (1<<j) - 1;
if (prarr1[num])
printf(" %lli ",num);
}
}
int main()
{
int n ;
printf("\n\n Generate Mersenne primes within a range of numbers:\n");
printf("--------------------------------------------------------\n");
printf(" Input a upper limit [range from 1 to upper limit]: ");
scanf("%d",&n);
printf(" Mersenne prime numbers are: \n");
chkMerPrime(n);
printf("\n\n");
}``````