Output of C++ programs | Set 40

Q.1 What is the output of following program?

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#include <iostream>
using namespace std;
int main()
{
    int i, j, k;
    int sum[2][4];
    for (i = 0; i < 2; i++) {
        for (j = 0; j < 3; j++)
            sum[i][j];
    }
    cout << sum[i][j];
    return 0;
}

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Option
a) 3 3
b) 2 0
c) garbage value
d) 2 3

Answer : c

Explanation : In this program, in given array we did not assign any value so it will be pointing to any garbage value.



Q.2 What is the output of following program?

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#include <iostream>
using namespace std;
int main()
{
    char m;
    switch (m) {
    case 'c':
        cout << "Computer Science";
    case 'm':
        cout << "Mathematics";
        break;
    case 'a':
        cout << "Accoutant";
        break;
    default:
        cout << "wrong choice";
    }
    return 0;
}

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Option
a) Computer Science, Mathematics
b) Mathematics
c) wrong choice
d) error

Answer : c

Explanation : In this program, m is a variable and it is not assigned any value which means – m is having any garbage value. So, it does’nt match any case and by default it will be print “wrong choice”.

Q.3 What is the output of following program?

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#include <iostream>
using namespace std;
#include <iostream>
using namespace std;
int main()
{
    int i, x[5], y, z[5];
    for (i = 0; i < 5; i++) {
        x[i] = i;
        z[i] = i + 3;
        y = z[i];
        x[i] = y++;
    }
    for (i = 0; i < 5; i++)
        cout << x[i] << " ";
    return 0;
}

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Option
a) 3 4 5 6 7
b) 4 5 6 7 8
c) 2 3 4 5 6
d) none of above

Answer : a

Explanation : In this loop, simply first assign the value of y and then increment so no change.

Q.4 What is the output of following program?

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#include <iostream>
using namespace std;
int max(int& x, int& y, int& z)
{
    if (x > y && y > z) {
        y++;
        z++;
        return x++;
    } else {
        if (y > x)
            return y++;
        else
            return z++;
    }
}
int main()
{
    int A, B;
    int a = 10, b = 13, c = 8;
    A = max(a, b, c);
    cout << a++ << " " << b-- << " " << ++c << endl;
    B = max(a, b, c);
    cout << ++A << " " << --B << " " << c++ << endl;
    return 0;
}

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Option
a) 10 14 8 or 14 13 8
b) 10 13 8 or 11 14 9
c) 10 14 9 or 14 12 9
d) 11 12 8 or 13 14 8

Answer : c

Explanation : Here, max function is to return max value and at the time of first print, the value of b decrements and remaining two a and c are same and remain same during second call of function.

Q.5 What is the output of following program?

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#include <iostream>
using namespace std;
int main()
{
    for (int i = 10; i > 6; i = i - 2)
        cout << i;
    for (int i = -5; i > -7; i--)
        cout << i + 1;
    return 0;
}

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Option
a) 10 8 6 -5 -6
b) 10 8 -4 -5
c) 10 8 -5 -6
d) 8 6 -4 -5

Answer : b

Explanation : First loop is executed and prints 10, 8 and then condition gets false, so loop exits. Then second loop is executed and checks the condition and print -4, -5 after that the condition becomes false then it gets terminated.

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