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#include <stdio.h>        
#include <math.h>
 
#define N 300             
 
//------
#define BOOL int
#define FALSE 0
#define TRUE 1
 
void displayPrime (BOOL checkPrime);         
BOOL checkPrime (int num);
 
main()                    
{
     BOOL is_prime[N+1];         
 
     displayPrime(is_prime);
 
     getchar();      
}
 
void displayPrime (BOOL check)          
{
     int I;
 
     for(I=1; I<N; I++)
     {
              checkPrime(is_prime[I]);
              if(is_prime[I]==TRUE)
              {
                      printf("%d\n", I);
              }
              else if(is_prime[I]==FALSE)
              {
                      printf("");
              }
     }
}
 
BOOL checkPrime (int num)
{
     int num;
 
     is_prime[1]=FALSE;
     for(I=2; I<=sqrt(N); I++)
     {
              for(num=I; num<=N/num; num=num*I)
              {
                      is_prime[num]=FALSE;    
              }         
              return(is_prime[I]);
     }
 
}

prog.c:14:1: warning: return type defaults to ‘int’ [-Wreturn-type]
prog.c: In function ‘main’:
prog.c:18:6: warning: passing argument 1 of ‘displayPrime’ makes integer from pointer without a cast [enabled by default]
prog.c:11:6: note: expected ‘int’ but argument is of type ‘int *’
prog.c: In function ‘displayPrime’:
prog.c:29:26: error: ‘is_prime’ undeclared (first use in this function)
prog.c:29:26: note: each undeclared identifier is reported only once for each function it appears in
prog.c:36:23: warning: zero-length gnu_printf format string [-Wformat-zero-length]
prog.c: In function ‘checkPrime’:
prog.c:43:10: error: ‘num’ redeclared as different kind of symbol
prog.c:41:22: note: previous definition of ‘num’ was here
prog.c:45:6: error: ‘is_prime’ undeclared (first use in this function)
prog.c:46:10: error: ‘I’ undeclared (first use in this function)
prog.c:55:1: warning: control reaches end of non-void function [-Wreturn-type]
prog.c: In function ‘main’:
prog.c:21:1: warning: control reaches end of non-void function [-Wreturn-type]

Standard output is empty