Primes

//gcc -o primes primes.c -lm

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

int main(int argc, char *argv[])
{
  int a = 1;
  int b = 2;
  
  while(a < 50) {
    float sa = sqrt(a)+1;
    while(b < sa) {
      float af = a;
      float bf = b;
      if(a/b == af/bf) {
        break;
      b++;
      }
    else {
      printf("%d is a prime!\n", a);
      break;
      }
    }
  b = 2;
  a++;
  }
  printf("\n");
  
  return 0;
}

#include <stdio.h>

int main(int argc, char *argv[])
{
    // integer values <= 50 to check for prime number
    int intValue = 2;

    // an array in which we put the prime numbers             
    int primes[100];

    // just an index value for exploring elements in the array             
    int indx = 0; 

    // if it is equal to 1 then the current number is a prime number
    int isPrimeFlag = 0;

    // shows, so far, how many prime number we have found       
    int primeCounter = 0;     


    while (intValue < 50)
    {
        // So this is the range, that is, for each intValue we have to search for
        // possible divisor within the range of [2; (intValue / 2) + 1] 
        int divTestLimit = (intValue / 2) + 1;
        int divisor = 2;

        isPrimeFlag = 1;
   
        while (divisor <= divTestLimit)
        {
            if (((intValue % divisor) == 0) && (intValue != 2))
            {
                // So there was a divisor, therefore, it is not a prime number
                isPrimeFlag = 0;

                // Because, we already have found a divisor, it is useless to continue
                // the search, we simply leave the inner while loop by break
                break;
            }

            // The next possible divisor
            ++divisor;
        }
        
        if (isPrimeFlag)
        {
            primes[primeCounter] = intValue;
            ++primeCounter;
        }
        ++intValue;
    }

    for (indx = 0 ; indx < primeCounter ; indx++)
        printf("%d, ", primes[indx]);
    
    printf("\n");

    return 0;
}

$ gcc -Wall testscript.c -o testscript
$ ./testscript
$ 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47,
$

for i in list:
  #do something

for(i=0; ???; i++) {
  //do something
  }