C/C /C Multiple Choice Questions Sample Test,Sample questions

Question:
Comment on the output of this C code?

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;
}

1.a

2.Infinite loop

3.Depends on what fgetc returns

4.Depends on the compiler


Question:
Comment on the output of this C code?

int main()
{
float f1 = 0.1;
if (f1 == 0.1)
printf("equal
");
else
printf("not equal
");
}

1.equal

2.not equal

3.Output depends on compiler

4.None of the mentioned


Question:
Comment on the output of this C code?

int main()
{
float f1 = 0.1;
if (f1 == 0.1f)
printf("equal
");
else
printf("not equal
");
}

1.equal

2. not equal

3.Output depends on compiler

4.None of the mentioned


Question:
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
", a[i]);
else
printf("FAIL
");
}

1.The compiler will flag an error

2.Program will compile and print the output 5

3.Program will compile and print the ASCII value of 5

4.Program will compile and print FAIL for 5 times


Question:
The format identifier '%i' is also used for _____ data type?

1.char

2.int

3.float

4.double


Question:
What is short int in C programming?

1.Basic data type of C

2.Qualifier

3.short is the qualifier and int is the basic datatype

4.All of the mentioned.


Question:
What is the output of the following C code(on a 64 bit machine)?

union Sti
{
int nu;
char m;
};
int main()
{
union Sti s;
printf("%d", sizeof(s));
return 0;
}

1.8

2.5

3.4

4.9


Question:
What is the output of this C code (on a 32-bit machine)?

int main()
{
int x = 10000;
double y = 56;
int *p = &x;
double *q = &y;
printf("p and q are %d and %d", sizeof(p), sizeof(q));
return 0;
}

1.p and q are 4 and 4

2.p and q are 4 and 8

3.Compiler error

4. p and q are 2 and 8


Question:
What is the output of this C code?

int main()
{
char chr;
chr = 128;
printf("%d
", chr);
return 0;
}

1.128

2.- 126

3. Depends on the compiler

4.None of the mentioned


Question:
What is the output of this C code?

int main()
{
float x = 'a';
printf("%f", x);
return 0;
}

1.a

2.run time error

3.a.0000000

4.97.000000


Question:
What is the size of an int data type?

1.4 Bytes

2.8 Bytes

3.Depends on the system/compiler

4.Cannot be determined.


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

1.short

2.int

3.long

4.double


Question:
Which is correct with respect to size of the datatypes?

1. char > int > float

2.int > char > float

3.char < int < double

4.double > char > int


Question:
Which of the datatypes have size that is variable?

1.int

2. struct

3.float

4.double


Question:
Which of the following is a User-defined data type?

1.typedef int Boolean;

2.typedef enum {Mon, Tue, Wed, Thu, Fri} Workdays;

3.struct {char name[10], int age};

4.All of the mentioned


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