Structure and Union - C Programming MCQ Questions and Answers Page-9 section-1

81.

What will be the output of the following 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

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82.

What will be the output of the following C code?

#include <stdio.h>
struct p
{
    int x;
    char y;
    struct p *ptr;
};
int main()
{
    struct p p = {1, 2, &p};
    printf("%d\n", p.ptr->x);
    return 0;
}

A. Compile time error

B. Undefined behaviour

C. 1

D. 2

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83.

What will be the output of the following C code?

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

A. hello

B. Run time error

C. Nothing

D. Depends on compiler

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84.

Comment on the output of the following C code.

#include <stdio.h>
struct temp
{
    int a;
    int b;
    int c;
};
main()
{
    struct temp p[] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
}

A. No Compile time error, generates an array of structure of size 3

B. No Compile time error, generates an array of structure of size 9

C. Compile time error, illegal declaration of a multidimensional array

D. Compile time error, illegal assignment to members of structure

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85.
Which of the following operation is illegal in structures?

A. Typecasting of structure

B. Pointer to a variable of the same structure

C. Dynamic allocation of memory for structure

D. All of the mentioned

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86.

The correct syntax to access the member of the ith structure in the array of structures is?

Assuming: struct temp
    {
        int b;
    }s[50];

A. s.b.[i];

B. s.[i].b;

C. s.b[i];

D. s[i].b;

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87.

What will be the output of the following C code?

#include <stdio.h>
struct p
{
    int x;
    char y;
};
int main()
{
    struct p p1[] = {1, 92, 3, 94, 5, 96};
    struct p *ptr1 = p1;
    int x = (sizeof(p1) / sizeof(ptr1));
    if (x == 1)
        printf("%d\n", ptr1->x);
    else
        printf("false\n");
}

A. Compile time error

B. 1

C. false

D. Undefined behaviour

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88.

What will be the output of the following C code?

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

A. Nothing

B. Compile time error

C. hey

D. Varies

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89.

What will be the output of the following C code?

#include <stdio.h>
union stu
{
    int ival;
    float fval;
};
void main()
{
    union stu r;
    r.ival = 5;
    printf("%d", r.ival);
}

A. 9

B. Compile time error

C. 16

D. 5

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90.

What will be the output of the following C code?

#include <stdio.h>
union
{
    int x;
    char y;
}p;
int main()
{
    p.y = 60;
    printf("%d\n", sizeof(p));
}

A. Compile time error

B. sizeof(int) + sizeof(char)

C. Depends on the compiler

D. sizeof(char)

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81.
What will be the output of the following 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++); }`

Answer & Solution

82.
What will be the output of the following C code?

`#include <stdio.h> struct p { int x; char y; struct p *ptr; }; int main() { struct p p = {1, 2, &p}; printf("%d\n", p.ptr->x); return 0; }`

Answer & Solution

83.
What will be the output of the following C code?

`#include <stdio.h> struct student { char c; }; void main() { struct student m; struct student s = &m; s->c = "hello"; printf("%s", s->c); }`

Answer & Solution

84.
Comment on the output of the following C code.

`#include <stdio.h> struct temp { int a; int b; int c; }; main() { struct temp p[] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}; }`

Answer & Solution

85.
Which of the following operation is illegal in structures?

Answer & Solution

86.
The correct syntax to access the member of the ith structure in the array of structures is?

`Assuming: struct temp { int b; }s[50];`

Answer & Solution

87.
What will be the output of the following C code?

`#include <stdio.h> struct p { int x; char y; }; int main() { struct p p1[] = {1, 92, 3, 94, 5, 96}; struct p *ptr1 = p1; int x = (sizeof(p1) / sizeof(ptr1)); if (x == 1) printf("%d\n", ptr1->x); else printf("false\n"); }`

Answer & Solution

88.
What will be the output of the following C code?

`#include <stdio.h> struct student { char c; struct student point; }; void main() { struct student s; struct student m; m.point = s; (m.point)->c = "hey"; printf("%s", s.c); }`

Answer & Solution

89.
What will be the output of the following C code?

`#include <stdio.h> union stu { int ival; float fval; }; void main() { union stu r; r.ival = 5; printf("%d", r.ival); }`

Answer & Solution

90.
What will be the output of the following C code?

`#include <stdio.h> union { int x; char y; }p; int main() { p.y = 60; printf("%d\n", sizeof(p)); }`

Answer & Solution

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Structure and Union - C Programming MCQ Questions and Answers

81. What will be the output of the following 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++); }

Answer & Solution

82. What will be the output of the following C code? #include <stdio.h> struct p { int x; char y; struct p *ptr; }; int main() { struct p p = {1, 2, &p}; printf("%d\n", p.ptr->x); return 0; }

Answer & Solution

83. What will be the output of the following C code? #include <stdio.h> struct student { char *c; }; void main() { struct student m; struct student *s = &m; s->c = "hello"; printf("%s", s->c); }

Answer & Solution

84. Comment on the output of the following C code. #include <stdio.h> struct temp { int a; int b; int c; }; main() { struct temp p[] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}; }

Answer & Solution

85. Which of the following operation is illegal in structures?

Answer & Solution

86. The correct syntax to access the member of the ith structure in the array of structures is? Assuming: struct temp { int b; }s[50];

Answer & Solution

87. What will be the output of the following C code? #include <stdio.h> struct p { int x; char y; }; int main() { struct p p1[] = {1, 92, 3, 94, 5, 96}; struct p *ptr1 = p1; int x = (sizeof(p1) / sizeof(ptr1)); if (x == 1) printf("%d\n", ptr1->x); else printf("false\n"); }

Answer & Solution

88. What will be the output of the following C code? #include <stdio.h> struct student { char *c; struct student *point; }; void main() { struct student s; struct student m; m.point = s; (m.point)->c = "hey"; printf("%s", s.c); }

Answer & Solution

89. What will be the output of the following C code? #include <stdio.h> union stu { int ival; float fval; }; void main() { union stu r; r.ival = 5; printf("%d", r.ival); }

Answer & Solution

90. What will be the output of the following C code? #include <stdio.h> union { int x; char y; }p; int main() { p.y = 60; printf("%d\n", sizeof(p)); }

Answer & Solution

Read More Section(Structure and Union)

81.
What will be the output of the following 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++); }`

82.
What will be the output of the following C code?

`#include <stdio.h> struct p { int x; char y; struct p *ptr; }; int main() { struct p p = {1, 2, &p}; printf("%d\n", p.ptr->x); return 0; }`

83.
What will be the output of the following C code?

`#include <stdio.h> struct student { char c; }; void main() { struct student m; struct student s = &m; s->c = "hello"; printf("%s", s->c); }`

84.
Comment on the output of the following C code.

`#include <stdio.h> struct temp { int a; int b; int c; }; main() { struct temp p[] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}; }`

85.
Which of the following operation is illegal in structures?

86.
The correct syntax to access the member of the ith structure in the array of structures is?

`Assuming: struct temp { int b; }s[50];`

87.
What will be the output of the following C code?

`#include <stdio.h> struct p { int x; char y; }; int main() { struct p p1[] = {1, 92, 3, 94, 5, 96}; struct p *ptr1 = p1; int x = (sizeof(p1) / sizeof(ptr1)); if (x == 1) printf("%d\n", ptr1->x); else printf("false\n"); }`

88.
What will be the output of the following C code?

`#include <stdio.h> struct student { char c; struct student point; }; void main() { struct student s; struct student m; m.point = s; (m.point)->c = "hey"; printf("%s", s.c); }`

89.
What will be the output of the following C code?

`#include <stdio.h> union stu { int ival; float fval; }; void main() { union stu r; r.ival = 5; printf("%d", r.ival); }`

90.
What will be the output of the following C code?

`#include <stdio.h> union { int x; char y; }p; int main() { p.y = 60; printf("%d\n", sizeof(p)); }`