This is the c programming questions and answers section on " Data Types " with explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand.
1. Comment on the output of this C code?
int main()
{
int a[5] = {1, 2, 3, 4, 5};
int i;
for (i = 0; i < 5; i++)
if ((
char)a[i] == '5')
printf(
"%d\n", a[i]);
else
printf(
"FAIL\n");
}
- A. The compiler will flag an error
- B. Program will compile and print the output 5
- C. Program will compile and print the ASCII value of 5
- D. Program will compile and print FAIL for 5 times
Answer: Option D
Explanation:
The ASCII value of 5 is 53, the char type-casted integral value 5 is 5 only.
Output:
$ cc pgm1.c
$ a.out
FAILED
FAILED
FAILED
FAILED
FAILED
2. The format identifier ‘%i’ is also used for _____ data type?
Answer: Option B
Explanation:
Both %d and %i can be used as a format identifier for int data type.
3. Which data type is most suitable for storing a number 65000 in a 32-bit system?
Answer: Option A
Explanation:
65000 comes in the range of short (16-bit) which occupies the least memory.
4. Which of the following is a User-defined data type?
- A. typedef int Boolean;
- B. typedef enum {Mon, Tue, Wed, Thu, Fri} Workdays;
- C. struct {char name[10], int age};
- D. All of the mentioned
Answer: Option D
Explanation:
typedef and struct are used to define user-defined data types.
5. What is the size of an int data type?
- A. 4 Bytes
- B. 8 Bytes
- C. Depends on the system/compiler
- D. Cannot be determined.
Answer: Option C
Explanation:
The size of the data types depend on the system.
