Find prime numbers (C source, 퍼옴)

#include
char prime_check(int num)
{
int flag=1;
for(int i=2;i<=num/2;i++)
if(num%i==0)
{
flag=0;
break;
}
return flag;
}
void main()
{
int num1,num2,count=0,max,min;
printf("시작 정수를 입력하세요=");
scanf("%d",&num1);
printf("최종 정수를 입력하세요=");
scanf("%d",&num2);
max=num1;
min=num2;
for(int i=num1;i<=num2;i++)
{
if(prime_check(i)==1)
{
count++;
if(i>max)
max=i;
if(i min=i;
//printf("%d is prime number\n",i);
}
}
printf("%d prime numbers\n",count);
printf("%d minimum prime number\n",min);
printf("%d maximum prime number\n",max);
}


Computer Science

Computer Science. It is very hard 'work' to study that.
Default C programming.
Data Structure. Programming Languege.
Java programming to study Object-Oriented programming.
Assembler. Data communication.
Linear Algebra.

C programming is English. I have studied little and can speak little.
Java programming likes Japanese. It have been known, but cannot use absolutely.
C++ programming likes Chinese. I haven't heard and can speak just 'nihaoma'
Assembler is LATIN!. It is a another dimension's languege...............

How can I study these perpect........!!!!!!!!