Help with printf

[timhuynh]

Hi everyone. This is my first post . I develop this program in C-Free 4.0 with <iostream> header... And it working

#include <iostream>
#include <cstdlib> 
#include <iomanip>
#include <ctime>

using namespace std;
int main ()
{    
    
    int random_num;
    srand((unsigned)time(0));
    
    bool assigned_players[32];
    
    for (int i=0;i<32;i++)
        assigned_players[i] = false;
        
    int n=32;
    cout<<"Game    Players"<<endl;
    while (n>0){
        random_num = (rand()%(32))+1;
        if (!assigned_players[random_num-1]){
            if ((32-n)%2==0){
                cout<<(32-n)/2+1;
                if (((32-n)/2+1)>9)
                    cout<<setw(8)<<random_num;
                else
                    cout<<setw(9)<<random_num;
            }
            
            if ((32-n)%2==1)
                cout<<" - "<<random_num<<endl;
            
            assigned_players[random_num-1] = true;
            
                
            n--;
        }
    }
        

    return 0;
}

But when i rebuild it without <iostream> header. It came up with some errors. Can any please help me? Thanks you:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#define SIZE 32
int main (void)
{
double x[SIZE];
int random_number;
int i, n;
srand((unsigned) time(0));
for (i=0;i<32;i++);
        x[i] = "false";
n=32;
Printf("Game    Player\n");

while (n>0){
        random_number = (rand()%(32))+1;
        if (!x[random_number-1]){
            if ((32-n)%2==0){
                printf("(32-n)/2+1\n");
                if (((32-n)/2+1)>9)
                    printf("%d\n",random_number);
                else
                    printf("%d\n",random_number);
            }
            
            if ((32-n)%2==1)
                printf("-\n",random_number);;
            
            x[random_number-1] = "true";
            
                
            n--;
        }
    }
        

    return 0;
}

Error is:
Checking file dependency...
Compiling C:\Program Files (x86)\C-Free 4\temp\Untitled1.cpp...
[Error] C:\Program Files (x86)\C-Free 4\temp\Untitled1.cpp:13: assignment to `double' from `const char *'
[Error] C:\Program Files (x86)\C-Free 4\temp\Untitled1.cpp:15: implicit declaration of function `int Printf(...)'
[Error] C:\Program Files (x86)\C-Free 4\temp\Untitled1.cpp:31: assignment to `double' from `const char *'

[WaltP]

Why are you trying to store the strings "false" and "true" into double variables?

And where did you define Printf()?

[timhuynh]

This is my fixed code. But still have some errors:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#define SIZE 32
int main (void)
{
    double x[SIZE];
    int random_number;
    int i, n;
    srand((unsigned) time(0));
    
    for (i=0;i<SIZE;i++)
        x[i] = false;
    n=32;
    printf("Game    Player\n");

while (n>0){
        random_number = (rand()%(32))+1;
        if (!x[random_number-1]){
            if ((32-n)%2==0){
                printf("%2d      ",(32-n)/2+1);
                printf("%2d ",random_number);
            }
           
            if ((32-n)%2==1)
                printf("- %2d\n",random_number);;
           
            x[random_number-1] = true;
           
               
            n--;
        }
    }
       

    return 0;
}

error: ‘false’ undeclared (first use in this function)
error: (Each undeclared identifier is reported only once
error: for each function it appears in.)
error: ‘true’ undeclared (first use in this function)

[WaltP]

false and true are not defined in C. You need to define them.

[timhuynh]

Sorry I just started with c++, can you help me how can i define true and false, please? thanks you

[thomas_naveen]

try #define

[WaltP]

If you are trying to learn C++ why are you concerned with making a C program?

[chiwawa10]

It is never wrong to start learning C when you want to pick up C++ skills. After all, C++ is the superset of C. Through this, you will be able to differentiate between both of them. For 'true' and 'false' are not defined in C language, you may want to define them through the macro #define.

Normally, programmers utilize integers to represent true and false values like:-

#define FALSE 0
#define TRUE 1

Where having a value zero always mean false.