Thread: C++ errors help

the code is this:

Code:

#include <stdio.h>
#include <math.h>

int main ()
{
    int a, b, r1, r2;
    
    printf("type in the 2 roots:");
    scanf("%d%d" &a, &b);
    r1 = a+b;
    r2 = a*b;
    printf("the equation in general form is: x*x+(%f)x+(%f)"r1, r2;
    system ("pause");
    return 0;
}

why doesn't it work?

Because you don't have a comma between your close quotation and r1, or between the close quote and &a.

thanks
i smash my head in the table when hearing this

another new problem occurs.....

Code:

#include <stdio.h>
#include <math.h>

int main ()
{
    int a, b, r1, r2;
    
    printf("type in the 2 roots:");
    scanf("%d%d", &a, &b);
    r1 = a+b;
    r2 = a*b;
    printf("the equation in general form is: x*x+(%f)x+(%f)", r1, r2);
    
     system("pause");
     return 0;
}

the program says that there is error in those red words i labelled
how come there is a mistake?

it's C++

First of all compiling your this code with g++ doesn't mean it c++ what features of c++ you are using in it...

well the errors are

Code:

#include <stdio.h>
#include <math.h>
#include <windows.h> // include this file on ms windows for system API call

int main ()
{
    int a, b, r1, r2;
    
    printf("type in the 2 roots:");
    scanf_s("%d %d", &a, &b); // , coma was missing
    r1 = a+b;
    r2 = a*b;
    printf("the equation in general form is: x*x+(%f)x+(%f)",r1, r2); // ) brace and , was missing
    system ("pause");
    return 0;
}

Originally Posted by laserlight

Actually, <cstdlib> is the correct header for std::system. Or if you prefer to use the C header, it would be <stdlib.h>.

By the way, please do not change the code to use the non-standard scanf_s, at least not without explaining very clearly the ramifications of such a change.

About header file u are correct that can be done also



And about scanf_s on microsoft see this

warning C4996: 'scanf' was declared deprecated
C:\Program Files\Microsoft Visual Studio 8\VC\include\stdio.h(295) : see declaration of 'scanf'
Message: 'This function or variable may be unsafe. Consider using scanf_s instead. To disable deprecation, use _CRT_SECURE_NO_DEPRECATE. See online help for details.'

Thanks guys.....
the problem is solved