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#include <cstdlib>
#include <iostream>
#include <cmath>
#define max 30
using namespace std;
 
int main()
{
	int tab[21];
	int maximum=0;
	bool ok=false;
	for(int i=0;i<21;i++)tab[i]=0;
	int k=10,l,j;
	while(true)
	{
		cin>>l;
		tab[l+10]++;	
	}
	for(int i=0;i<21;i++)
	if(tab[i]>maximum)maximum=tab[i];
 
	for(int i=0;i<21;i++)
	{
	int dl=round(max*tab[i]/maximum);
 
	cout.right;
	cout.width(4);
	cout<<i-10<<":|";
	for(j=0;j<dl;j++)
	  cout<<"*";
	  cout.width(max-j+1);
	  cout<<"|"<<endl;
	}
	//system("pause");
	return 0;
}
 

prog.c:1:19: error: cstdlib: No such file or directory
prog.c:2:20: error: iostream: No such file or directory
prog.c:3:17: error: cmath: No such file or directory
prog.c:5: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘namespace’
prog.c: In function ‘main’:
prog.c:11: error: ‘bool’ undeclared (first use in this function)
prog.c:11: error: (Each undeclared identifier is reported only once
prog.c:11: error: for each function it appears in.)
prog.c:11: error: expected ‘;’ before ‘ok’
prog.c:12: error: ‘for’ loop initial declaration used outside C99 mode
prog.c:14: error: ‘true’ undeclared (first use in this function)
prog.c:16: error: ‘cin’ undeclared (first use in this function)
prog.c:19: error: redefinition of ‘i’
prog.c:12: error: previous definition of ‘i’ was here
prog.c:19: error: ‘for’ loop initial declaration used outside C99 mode
prog.c:22: error: redefinition of ‘i’
prog.c:19: error: previous definition of ‘i’ was here
prog.c:22: error: ‘for’ loop initial declaration used outside C99 mode
prog.c:24: warning: implicit declaration of function ‘round’
prog.c:24: warning: incompatible implicit declaration of built-in function ‘round’
prog.c:26: error: ‘cout’ undeclared (first use in this function)
prog.c:32: error: ‘endl’ undeclared (first use in this function)
prog.c:13: warning: unused variable ‘k’

Standard output is empty