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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
int demtu(char s[])
{
	int dem=0;
	int tu;
	int l=strlen(s);
	for(int i=0;i<l;i++)
	if(s[i++]==' ')
		dem++;
	return dem;
 
}
int main()
{
	char s[100];
	int x;
	cout<<" nhap vao chuoi "<<endl;
	gets(s);
	x=demtu(s);
	cout<<"\nso lan xuat hien tu trong chuoi "<<x+1<<endl;
 
}// your code goes here
	}
}

Main.java:12: error: ';' expected
int demtu(char s[])
         ^
Main.java:12: error: ';' expected
int demtu(char s[])
                  ^
Main.java:23: error: ';' expected
int main()
        ^
Main.java:25: error: ']' expected
	char s[100];
	       ^
Main.java:25: error: illegal start of expression
	char s[100];
	          ^
Main.java:27: error: not a statement
	cout<<" nhap vao chuoi "<<endl;
	                        ^
Main.java:30: error: not a statement
	cout<<"\nso lan xuat hien tu trong chuoi "<<x+1<<endl;
	                                               ^
7 errors

Standard output is empty