Q:

C++ Preprocessor | Find output programs | Set 3

belongs to collection: C++ find output programs

robaa

Save to bookmark

|

2022-11-21

|

220

0

This section contains the C++ find output programs with their explanations on C++ Preprocessor (set 3).

Program 1:

#include <iostream>
#include <string.h>

#define student(R, F) cout << "Roll Number: " << #R << " Fees: " << #F

using namespace std;

int main()
{
    int roll_no = 101;
    int fees = 1000;

    student(roll_no, fees);

    return 0;
}

Program 2:

#include <iostream>
#include <stdio.h>

#define MACRO(A, B) cout << A##B;

using namespace std;

int main()
{
    int A = 101;
    int B = 102;
    int AB = 103;

    MACRO(A, B);

    return 0;
}

Program 3:

#include <iostream>
#include <stdio.h>

#define A 10

#ifdef A
#define A 20
#else
#define A 30
#endif

using namespace std;

int main()
{
    cout << A << endl;

    return 0;
}

Program 4:

#include <iostream>
#include <stdio.h>

#define A 10
#define B 20

#ifdef A > B
#define Large A
#else
#define Large B
#endif

using namespace std;

int main()
{
    cout << Large << endl;

    return 0;
}

Program 5:

#include <iostream>
#include <stdio.h>

#define A 10
#define B 20

#ifndef B = A
#define Large A
#else
#define Large B
#endif

using namespace std;

int main()
{
    cout << Large << endl;

    return 0;
}

C++ programming, examples, C++ programming examples,

login and add your own answer to this question

All Answers

robaa

2022-11-21

need an explanation for this answer? contact us directly to get an explanation for this answer

Answer Program1 :

Output:

Roll Number: roll_no Fees: fees

Explanation:

The above program will print "Roll Number: roll_no Fees: fees" on the console screen. Let's understand the program, we defined student() macro that uses the pound symbol '#', which is used to print variable name instead of value. Then the roll_no and fees will be printed instead of their values.

Answer Program 2:

Output:

Explanation:

The above code will print 103 on the console screen, because here we used token pasting "##" operator, which is used to concatenate the name of two variable, in our case, we concatenate A and B, and it becomes AB, then the value of AB will print on the console screen. That is 30.

Answer Program 3:

Output:

Explanation:

The above code will print 20 on the console screen. In the above program, we used conditional preprocessor directives. Here we defined a macro called A that contains value A, and check if A is defined then it will be defined by 20 otherwise A will be defined by 30. That's why 20 will be printed on the console screen.

Answer Program 4:

Output:

Explanation:

In the above program, we defined two macros A and B, then we checked the condition (A>B) using #ifdef, but using #ifdef we can check specified macro is defined or not, that's why here #ifdef check macro "A" is defined then it will be defined "Large" by "A", and then it will print "10" on the console screen.

Answer Program 5:

Output:

Explanation:

In the above program, we defined two macros A and B, then we used (B=A) in #ifndef, but using #ifndef we can check specified macro is not defined, that's why here #ifndef check macro "B" is not defined then it will be defined "Large" by "B" in #else directive, and then it will print "20" on the console screen.

need an explanation for this answer? contact us directly to get an explanation for this answer

total answers (1)

C++ Signal Handling | Find output programs | Set 1... >>

<< C++ Preprocessor | Find output programs | Set 2...