C Programming Questions and Answers – Data Types and Sizes – 1

C Programming Questions and Answers – Data Types and Sizes – 1

1.Comment on the output of this C code?

#include <stdio.h>

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

2.The format identifier ‘%i’ is also used for _____ data type?

a) char

b) int

c) float

d) double

3.Which data type is most suitable for storing a number 65000 in a 32-bit system?

a) signed short

b) unsigned short

c) long

d) int

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

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

6.What is the output of this C code?

#include  <stdio.h>

int main()

{

signed char chr;

chr = 128;

printf(“%d\n”, chr);

return 0;

}

a) 128

b) -128

c) Depends on the compiler

d) None of the mentioned

7.Comment on the output of this C code?

#include  <stdio.h>

int main()

{

char c;

int i = 0;

FILE *file;

file = fopen(“test.txt”, “w+”);

fprintf(file, “%c”, ‘a’);

fprintf(file, “%c”, -1);

fprintf(file, “%c”, ‘b’);

fclose(file);

file = fopen(“test.txt”, “r”);

while ((c = fgetc(file)) !=  -1)

printf(“%c”, c);

return 0;

}

a) a

b) Infinite loop

c) Depends on what fgetc returns

d) Depends on the compiler

8.What is short int in C programming?

a) Basic datatype of C

b) Qualifier

c) short is the qualifier and int is the basic datatype

d) All of the mentioned