Structure in C Language

Q 1: What is the output of this C code?


    #include <stdio.h>
    struct student
    {
        char *name;
    };
    void main()
    {
        struct student s, m;
        s.name = "st";
        m = s;
        printf("%s%s", s.name, m.name);
    }

A Compile time error
B Nothing
C Junk values
D st st

Q 2: What is the output of this C code?


    #include <stdio.h>
    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

Q 3: What will be the output of the following C code?


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

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

Q 4: Which of the following is not possible under any scenario?

A s1 = &s2;
B s1 = s2;
C (*s1).number = 10;
D None of the mentioned

Q 5: Which of the following operation is illegal in structures?

A Typecasting of structure
B Pointer to a variable of same structure
C Dynamic allocation of memory for structure
D All of the mentioned

Q 6: 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

structure

The code "s.t.b = 10" suggests that there is a data structure or a variable named "s" which contains another data structure or variable named "t" which in turn contains a variable named "b". The code assigns the value 10 to the variable "b".

In C language, such a data structure or variable can be defined using a struct. Here is an example of how this code could be implemented in C:


struct t {
    int b;
};

struct s {
    struct t t;
};

int main() {
    struct s s;
    s.t.b = 10;
    return 0;
}

In this example, a struct "t" is defined which contains a single integer variable "b". Another struct "s" is defined which contains an instance of struct "t". In the main function, an instance of struct "s" is created and the value 10 is assigned to the variable "b" using the syntax "s.t.b = 10".

Q 7: The output of the code below is


    #include <stdio.h>
    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

Q 8: Which of the following are themselves a collection of different data types?

A string
B structures
C char
D all of the mentioned

Q 9: User-defined data type can be derived by___________

A struct
B enum
C typedef
D all of the mentioned

Q 10: Which operator connects the structure name to its member name?

B <-
C .
D Both <- and .

Q 11: Which of the following cannot be a structure member?

A Another structure
B Function
C Array
D None of the mentioned

Q 12: Which of the following structure declaration will throw an error?

A struct temp{}s;
main(){}
B struct temp{};
struct temp s;
main(){}
C struct temp s;
struct temp{};
main(){}
D None of the mentioned

Q 13: What is the output of this C code?


    #include <stdio.h>
    struct student
    {
        int no;
        char name[20];
    }
    void main()
    {
        struct student s;
        s.no = 8;
        printf("hello");
    }

A Compile time error
B Nothing
C hello
D Varies

Q 14: What is the output of this C code?


    #include <stdio.h>
    struct student
    {
        int no = 5;
        char name[20];
    };
    void main()
    {
        struct student s;
        s.no = 8;
        printf("hello");
    }

A Nothing
B Compile time error
C hello
D Varies

Q 15: What is the output of this C code?


    #include <stdio.h>
    struct student
    {
        int no;
        char name[20];
    };
    void main()
    {
        student s;
        s.no = 8;
        printf("hello");
    }

A Nothing
B hello
C Compile time error
D Varies

Q 16: What is the output of this C code?


    #include <stdio.h>
    void main()
    {
        struct student
        {
            int no;
            char name[20];
        };
        struct student s;
        s.no = 8;
        printf("%d", s.no);
    }

A Nothing
B Compile time error
C Junk
D 8

Q 17: Can the above code be compiled successfully?


    #include <stdio.h>
    struct p
    {
        int k;
        char c;
        float f;
    };
    int main()
    {
        struct p x = {.c = 97, .f = 3, .k = 1};
        printf("%f\n", x.f);
    }

A Yes
B No
C Depends on the standard
D Depends on the platform

Q 18: What is the output of this C code?


    #include <stdio.h>
    void main()
    {
        struct student
        {
            int no;
            char name[20];
        };
        struct student s;
        no = 8;
        printf("%d", no);
    }

A Nothing
B Compile time error
C Junk
D ) 8

Q 19: Number of bytes in memory taken by the below structure is



    #include <stdio.h>
    struct test
    {
        int k;
        char c;
    };

A Multiple of integer size
B integer size+character size
C Depends on the platform
D Multiple of word size

Q 20: What is the output of this C code?


    #include <stdio.h>
    struct
    {
        int k;
        char c;
    };
    int main()
    {
        struct p;
        p.k = 10;
        printf("%d\n", p.k);
    }

A Compile time error
B 10
C Undefined behaviour
D Segmentation fault

Q 21: What is the output of this C code?


    #include <stdio.h>
    struct
    {
        int k;
        char c;
    } p;
    int p = 10;
    int main()
    {
        p.k = 10;
        printf("%d %d\n", p.k, p);
    }

A Compile time error
B 10 10
C Depends on the standard
D Depends on the compiler

Q 22: What is the output of this C code?


    #include <stdio.h>
    struct p
    {
        int k;
        char c;
    };
    int p = 10;
    int main()
    {
        struct p x;
        x.k = 10;
        printf("%d %d\n", x.k, p);
    }

A Compile time error
B 10 10
C Depends on the standard
D Depends on the compiler

Q 23: What is the output of this C code?


    #include <stdio.h>
    struct p
    {
        int k;
        char c;
        float f;
    };
    int p = 10;
    int main()
    {
        struct p x = {1, 97};
        printf("%f %d\n", x.f, p);
    }

A Compile time error
B 0.000000 10
C Somegarbage value 10
D 0 10

Q 24: What is the output of this C code(according to C99 standard)?


    #include <stdio.h>
    struct p
    {
        int k;
        char c;
        float f;
    };
    int main()
    {
        struct p x = {.c = 97, .f = 3, .k = 1};
        printf("%f\n", x.f);
    }

A 3.000000
B Compile time error
C Undefined behaviour
D 1.000000

Q 25: What is the output of this C code(according to C99 standard)?

 #include 
    struct p
    {
        int k;
        char c;
        float f;
    };
    int main()
    {
        struct p x = {.c = 97, .k = 1, 3};
        printf("%f \n", x.f);
    }

A 3.000000
B 0.000000
C Compile time error
D Undefined behaviour

Q 26: What is the output of this C code(according to C99 standard)?


    #include <stdio.h>
    struct p
    {
        int k;
        char c;
        float f;
    };
    int main()
    {
        struct p x = {.c = 97};
        printf("%f\n", x.f);
    }

A 0.000000
B Somegarbagevalue
C Compile time error
D None of the mentioned

Q 27: What is the output of this C code?


    #include <stdio.h>
    struct point
    {
        int x;
        int y;
    };
    int main()
    {
        struct point p = {1};
        struct point p1 = {1};
        if(p == p1)
            printf("equal\n");
        else
            printf("not equal\n");
    }

A Compile time error
B equal
C depends on the standard
D not equal

Q 28: What is the output of this C code?


    #include <stdio.h>
    struct point
    {
        int x;
        int y;
    };
    struct notpoint
    {
        int x;
        int y;
    };
    struct point foo();
    int main()
    {
        struct point p = {1};
        struct notpoint p1 = {2, 3};
        p1 = foo();
        printf("%d\n", p1.x);
    }
    struct point foo()
    {
        struct point temp = {1, 2};
        return temp;
    }

A Compile time error
B 1
C 2
D Undefined behaviour

Q 29: What is the output of this C code?


    #include <stdio.h>
    struct point
    {
        int x;
        int y;
    };
    struct notpoint
    {
        int x;
        int y;
    };
    int main()
    {
        struct point p = {1};
        struct notpoint p1 = p;
        printf("%d\n", p1.x);
    }

A Compile time error
B 1
C 0
D Undefined

Q 30: What is the output of this C code?


    #include <stdio.h>
    struct point
    {
        int x;
        int y;
    };
    struct notpoint
    {
        int x;
        int y;
    };
    void foo(struct point);
    int main()
    {
        struct notpoint p1 = {1, 2};
        foo(p1);
    }
    void foo(struct point p)
    {
        printf("%d\n", p.x);
    }

A Compile time error
B 1
C 0
D Undefined

Q 31: What is the output of this C code?


    #include <stdio.h>
    struct point
    {
        int x;
        int y;
    };
    void foo(struct point*);
    int main()
    {
        struct point p1 = {1, 2};
        foo(&p1);
    }
    void foo(struct point *p)
    {
        printf("%d\n", *p.x++);
    }

A Compile time error
B Segmentation fault/code crash
C 2
D 1

Q 32: What is the output of this C code?


    #include <stdio.h>
    struct point
    {
        int x;
        int y;
    };
    void foo(struct point*);
    int main()
    {
        struct point p1 = {1, 2};
        foo(&p1);
    }
    void foo(struct point *p)
    {
        printf("%d\n", *p->x++);
    }

A Compile time error
B 1
C Segmentation fault/code crash

Q 33: What is the output of this C code?

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

A Compile time error
B alan
C Nothing
D Varies

Q 34: What is the output of this C code?


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

A Nothing
B alan
C Run time error
D Varies

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