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#include <stdio.h>
#include <math.h>
 
int a(int);
 
int main()
{
   int n;
   long long sum=0;
 
   printf("숫자를 입력하세요 : ");
   scanf_s("%d", &n);
 
   for (int i = 2; i <= n; i++)
   {
      sum += a(i);
   }
 
   printf("%l입니다 \n", sum);
 
   system("pause");
}
 
int a(int n) 
{
   double m = floor(sqrt((double)n));
 
   for (int i = 2; i <= m; i++)
   {
      if (n%i==0)
      {
         return 0;
      }
   }
   return n;
}

prog.c: In function ‘main’:
prog.c:12:4: warning: implicit declaration of function ‘scanf_s’ [-Wimplicit-function-declaration]
    scanf_s("%d", &n);
    ^~~~~~~
prog.c:19:14: warning: unknown conversion type character 0xffffffec in format [-Wformat=]
    printf("%l입니다 \n", sum);
              ^
prog.c:19:11: warning: too many arguments for format [-Wformat-extra-args]
    printf("%l입니다 \n", sum);
           ^~~~~~~~~~~~~~~~
prog.c:21:4: warning: implicit declaration of function ‘system’ [-Wimplicit-function-declaration]
    system("pause");
    ^~~~~~
/home/c5uTk6/ccHtpW6K.o: In function `main':
prog.c:(.text.startup+0x23): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status

Standard output is empty