C Exercises: Get the 1001st prime number
C Programming Practice: Exercise-23 with Solution
By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13.
The first six prime numbers are 2, 3, 5, 7, 11, and 13.
Write a C programming to get the 1001st prime number?
C Code:
#include <stdio.h>
int main(void)
{
char *s;
size_t i;
unsigned ctr = 0;
size_t n = 1000000;
const unsigned target_val = 1001;
s = calloc(n, sizeof *s);
for (i = 2; i < n; i++) {
if (!s[i]) {
size_t j;
ctr++;
if (ctr == target_val) {
printf("%lu\n", i);
break;
}
for (j = i*2; j < n; j += i) {
s[j] = 1;
}
}
}
free(s);
return 0;
}
Sample Output:
7927
Flowchart:

C Programming Code Editor:
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Previous: Write a C programming to find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.
Next: Write a C programming to find the thirteen adjacent digits in the 1000-digit number that have the greatest product. What is the value of this product?
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
C Programming: Tips of the Day
Maximum value of int:
In C:
#include <limits.h> then use int imin = INT_MIN; // minimum value int imax = INT_MAX;
or
#include <float.h> float fmin = FLT_MIN; // minimum positive value double dmin = DBL_MIN; // minimum positive value float fmax = FLT_MAX; double dmax = DBL_MAX;
Ref : https://bit.ly/3fi8yk9
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