Structures Questions in C

A structure is a user defined data type in C/C++. A structure creates a data type that can be used to group items of possibly different types into a single type.

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1.
What is the output?

#include

    struct student

    {

        char *name;

    };

    struct student s;

    struct student fun(void)

    {

        s.name = "newton";

        printf("%s\n", s.name);

        s.name = "alan";

        return s;

    }

    void main()

    {

        struct student m = fun();

        printf("%s\n", m.name);

        m.name = "turing";

        printf("%s\n", s.name);

    }

A.  newton alan alan

B.  alan newton alan

C.  alan alan newton

D.  Compile time error

Answer: A

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2.
The output of the code below is

#include
    struct student
    {
        char *name;
    };
    struct student fun(void)
    {
        struct student s;
        s.name = "alan";
        return s;
    }
    void main()
    {
        struct student m = fun();
        s.name = "turing";
        printf("%s", m.name);
    }

A. alan
B. Turing
C. Compile time error
D.  Nothing

Answer: C
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3.
Which of the following accesses a variable in structure b?

A. b->var;
B. b.var;
C. b-var;
D. b>var;

Answer: B
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4.
Which of the following is a properly defined struct?
A. struct {int a;}
B. struct a_struct {int a;}
C. struct a_struct int a;
D. struct a_struct {int a;};

Answer: D
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5.
Which properly declares a variable of struct foo?
A. struct foo;
B. struct foo var;
C. foo;
D. int foo;

Answer: B
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6.
Which of the following return-type cannot be used for a function in C?

A. char *
B. struct
C. void
D. none of the mentioned

Answer: D
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7.
Find the output?

#include
    struct temp
    {
        int a;
    } s;
    void func(struct temp)
    {
        s.a = 10;
        printf("%d\t", s.a); s
    }
    main()
    {
        func(s);
        printf("%d\t", s.a);
    }

A. 10 (Garbage Value)
B. 0 10
C. 10 0
D. (Garbage Value) 10

Answer: C
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8.
Presence of code like “s.t.b = 10” indicate.
A. Syntax Error
B. structure
C. double data type
D. An ordinary variable name

Answer: B
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9.
Find the output?

#include
    struct student
    {
        char *name;
    };
    struct student fun(void)
    {
        struct student s;
        s.name = "alan";
        return s;
    }
    void main()
    {
        struct student m = fun();
        s.name = "turing";
        printf("%s", m.name);
    }

A. alan
B. Turing
C. Compile time error
D. Nothing

Answer: C
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