C Programming Practice MCQs

Question 1

Which data type is most suitable to store the number 65000 on a 32-bit system?

Accepted Answer

D. `unsigned short`

Answer

`long`

Answer

`signed short`

Answer

`int`

Answer

`unsigned short`

Question 2

What is printed? ```c signed char a = 322; unsigned char b = -1; printf("%d %d %c", b-a, sizeof(a=1), a); ```

Accepted Answer

C. 189, 1, B

Answer

127, 4, -124

Answer

-323, 1, 322

Answer

189, 1, B

Answer

127, 4, A

Question 3

Which of the following is NOT a valid escape sequence?

Accepted Answer

A. `\q`

Answer

`\q`

Answer

`\f`

Answer

`\a`

Answer

`\v`

Question 4

Which of the following does `\r` do?

Accepted Answer

B. Moves cursor to beginning of same line

Answer

Moves cursor to next line

Answer

Moves cursor to beginning of same line

Answer

Moves cursor one char back

Answer

Inserts vertical tab

Question 5

Copy one structure to another:

Accepted Answer

All of these

Answer

`memcpy`

Answer

`s1 = s2;`

Answer

Field-by-field

Question 6

What is the range of a `signed short` on most 32-bit systems?

Accepted Answer

C. -32,768 to 32,767

Answer

-2³¹ to 2³¹-1

Answer

-128 to 127

Answer

-32,768 to 32,767

Answer

0 to 65,535

Question 7

Bit-fields: which is FALSE?

Accepted Answer

Can exceed specified bits safely

Answer

`#pragma pack(1)` removes padding

Answer

Inside struct/union

Answer

`&` not allowed

Question 8

Which of the following is an implicit typecast?

Accepted Answer

A. `int x = 45.67;`

Answer

`int x = 45.67;`

Answer

`float f = (float)5/3;`

Answer

`int *p = (int*)malloc(4);`

Answer

`char c = (char)65;`

Question 9

`sizeof` a structure:

Accepted Answer

B. At least sum (with padding)

Answer

Sum of members

Answer

At least sum (with padding)

Answer

Always 8

Answer

Largest member

Question 10

What is printed? ```c signed char ch = 128; printf("%d", ch); ```

Accepted Answer

C. -128

Answer

128

Answer

garbage

Answer

-128

Answer

compiler dependent

Question 11

Output? ```c typedef struct { int a1; char ch; } demo_t; demo_t s1={1}, s2={1}; if (s1 == s2) ... else ... ```

Accepted Answer

D. Compile error

Answer

Runtime

Answer

Sunbeam Pune

Answer

sunbeam Karad

Answer

Compile error

Question 12

A nested structure:

Accepted Answer

B. Struct containing another struct member

Answer

Stacked unions

Answer

Struct containing another struct member

Answer

Not allowed

Answer

Array of arrays

Question 13

Output? ```c union demo { int a1; unsigned k1:2; unsigned char s1:6; } st; st.s1=127; st.k1=8; st.a1=15; int *p = st.a1; ++*p; // Treating int as pointer … ```

Accepted Answer

B. Error

Answer

`63,0,8,4,4`

Answer

Error

Answer

all 16

Answer

all 15

Question 14

What does the following code print? ```c short x = 32767; x = x + 1; printf("%d
", x); ```

Accepted Answer

C. -32768

Answer

32768

Answer

0

Answer

-32768

Answer

32767

Question 15

Which is NOT a type modifier in C?

Accepted Answer

D. `big`

Answer

`signed`

Answer

`unsigned`

Answer

`short`

Answer

`big`

C Programming Practice MCQs

C Programming Free MCQs

Which data type is most suitable to store the number 65000 on a 32-bit system?

What is printed? ```c signed char a = 322; unsigned char b = -1; printf("%d %d %c", b-a, sizeof(a=1), a); ```

Which of the following is NOT a valid escape sequence?

Which of the following does `\r` do?

Copy one structure to another:

What is the range of a `signed short` on most 32-bit systems?

Bit-fields: which is FALSE?

Which of the following is an implicit typecast?

`sizeof` a structure:

What is printed? ```c signed char ch = 128; printf("%d", ch); ```

Output? ```c typedef struct { int a1; char ch; } demo_t; demo_t s1={1}, s2={1}; if (s1 == s2) ... else ... ```

A nested structure:

Output? ```c union demo { int a1; unsigned k1:2; unsigned char s1:6; } st; st.s1=127; st.k1=8; st.a1=15; int p = st.a1; ++p; // Treating int as pointer … ```

What does the following code print? ```c short x = 32767; x = x + 1; printf("%d\n", x); ```

Which is NOT a type modifier in C?

Output? `printf("%d", sizeof('A'));` (C compiler, not C++)

Struct member can be pointer to same struct type?

Which keyword allows a variable's address to be taken?

Short alias for a struct type:

Which of the following is an automatic variable?

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