Question

How to run #include <stdblib.h> like run system("cls")

Answer 1

CLS is a Windows command. OnlineGDB runs on Unix based operating system. Use

system("clear");

instead.

Note: The compiler may reorganize your code for optimization reasons, so don't be surprised if simple programs like

#include <stdio.h>
#include <stdlib.h>

int main()
{
    printf("Type some text then hit ENTER! : ");
//    scanf("%*s");
//    system("clear");
    printf("Hello World");
    return 0;
}

do not work as you would have expected. But if you uncomment those two lines, the screen will be cleared (as the printf calls cannot be optimized together anymore).

Answer 2

not use system (" cls" ) , use system (" clear " )

#include <stdlib.h>

Comments

exemple an small code working with it Clear. Software make count of phone .

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
using namespace std;


int pay1,minutes;

int main()  {
   
    label1:
    system("clear");
    cout<<"What value you pay ? 39, 59 or 69 ?   ";
    cin >> pay1;
    cout << "What minute you used ?   ";
    cin>> minutes;
    
   
   if (pay1 == 39 ) {  cout << "You Pay 39$ "<< "\n";
   cout << "Your total Bill is " << pay1 + minutes*0.45 << "\n" ; }
    else if ( pay1 == 59) { cout << "You Pay 59$" << "\n";  
    cout << "Your total Bill is " << pay1 + minutes*0.40 << "\n" ; }
    else if ( pay1 == 69) { cout << "You Pay 69" << "\n";  
    cout << "Your total Bill is ilimitate "  << "\n" ; }
    else {cout << "You tape value wrong" << "\n"  ;}
 
goto label1;
    return 0;
}