Explore topic-wise MCQs in C Programming.

This section includes 52 Mcqs, each offering curated multiple-choice questions to sharpen your C Programming knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following is the correct output for the program given below?
#include <stdio.h>
int main ( )
{
 double d = 2.25;
 printf ("%e", d);
 printf ("%f", d);
 printf ("%g".d);
 printf ("%lf n", d);
 return 0 ;
}

A. 2.2 2.50 2.50 2.5
B. 2.2e 2.25f 2.00 2.25
C. 2.250000e + 000 2.250000 2.25 2.250000
D. Error
Answer» D. Error
Discussion
2.

Which of the following is the correct output for the program given below?
#include <stdio.h>
int main ( )
{
 float f = 43.20;
 printf ("%e", f);
 printf ("%f", f);
 printf ("%g  n" , f);
 return 0 ;
}
A. 4.320000e + 001 43.200001 43.2
B. 4.3 43.22 43.21
C. 4.3e 43.20f 43.00
D. Error
Answer» B. 4.3 43.22 43.21
Discussion
3.

Which of the following statements are correct about the program given below?
#include <stdio.h>
int main ()
 {
 float k = 0.7;
 if (k < 0.7)
 printf ("C n");
 else
 printf ("C++ n");
 return 0 ;
}
A. The program will output C
B. The program will output C++
C. Compiler will report an error saying a float cannot be compared with a double.
D. Output will be C for 16-bit compilers and C++ for 32-bit compilers
Answer» B. The program will output C++
Discussion
4.

Which of the following is the correct output for the program given below?
#include <stdio.h>
int main ( )
{
 float n = 2.39;
 printf("%f %f n", ceil (n), floor (n)) ;
 return 0 ;
}
A. 3.000000 2.000000
B. 2.500000 2.500000
C. 2.550000 3.000000
D. 2.000000 3.000000
Answer» B. 2.500000 2.500000
Discussion
5.

Which of the following is the correct output for the program given below?
#include <stdio.h>
#include <math.h>
int main ( )
{
 printf ( "%f n" ,sqrt (49.0));
 return 0 ;
}
A. 7.0
B. 7
C. 7.000000
D. Error : Prototype of sqrt ( ) not found
Answer» D. Error : Prototype of sqrt ( ) not found
Discussion
6.

Which of the following is the correct output for the program given below?
#include<stdio.h>
int main ( )
{
 float *p;
 printf ( "%d n " , sizeof ( p ) );
 return 0 ;
}
A. 2 in 16-bit compiler like TC/TC++, 4 in 32-bit compiler like Visual studio or gcc
B. 4 in 16-bit compiler like TC/TC++, 2 in 32-bit compiler like Visual Studio or gcc
C. 4 in 16-bit compiler like TC/TC++, 4 in 32-bit compiler like Visual Studio or gcc
D. 2 in 16-bit compiler like TC/TC++, 2 in 32-bit compiler like Visual studio or gcc
Answer» B. 4 in 16-bit compiler like TC/TC++, 2 in 32-bit compiler like Visual Studio or gcc
Discussion
7.

Which error are you likely to get when you run the following program in TC/TC++?
#include <stdio.h>
int main ( )
{
 struct emp
 {
 char name[20];
 float sal;
 };
 struct emp e[10];
 int i ;
 for (i = 0; i <= 9; i++)
 {
 printf ("Enter name and salary : ");
 scanf ("%s %f" , e[ i ].name, &e[ i ].sal);
 }
 return 0 ;
}
A. Suspicious pointer conversion
B. Floating point formats not linked
C. Cannot use scanf ( ) for structures
D. Strings cannot be nested inside structures
Answer» C. Cannot use scanf ( ) for structures
Discussion
8.

If the binary equivalent of 5.375 in normalized form is 0100 0000 1010 1100 0000 0000 0000 0000, what will be the output of the following program?
#include <stdio.h>
int main ( )
{
 float a =5.375 ;
 char *p ;
 int i ;
 p = (char *) &a ;
 for (i = 0 ; i <= 3 ; i++)
 printf("%02 X  n" , (unsigned char) p[ i ]);
 return 0 ;
}
A. 40 AC 00 00
B. 04 CA 00 00
C. 00 00 AC 40
D. 00 00 CA 04
Answer» D. 00 00 CA 04
Discussion
9.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 float num = 0.3;
 if (num == 0.3)
 printf("Interview Mania");
 else
 printf("Advanced C Classes");
 }
A. Advanced C Classes
B. Interview Mania
C. Compilation Error
D. Runtime Error
E. None of these
Answer» B. Interview Mania
Discussion
10.

What will be the output of the following C code?
 #include <stdio.h>
 int main()
 {
 float f = 'I';
 printf("%f", f);
 return 0;
 }
A. Compilation Error
B. I
C. 73.000000
D. Runtime Error
E. None of these
Answer» D. Runtime Error
Discussion
11.

What will be the output of the following C code?
 #include <stdio.h>
 int main()
 {
 unsigned int n = 25;
 signed char ch = -25;
 if (n > ch)
 {
 printf("Yes n");
 }
 else if (n < ch)
 {
 printf("No n");
 }
 }
A. Yes
B. No
C. Depends on the compiler
D. Depends on the compiler
E. None of these
Answer» C. Depends on the compiler
Discussion
12.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 int n = 98;
 char m = n;
 printf("%c n", m);
 }
A. 98
B. Compilation error
C. b
D. Garbage value
E. None of these
Answer» D. Garbage value
Discussion
13.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 double n = 23458965.12124;
 int m = n;
 printf("%d", m);
 printf(" %lf", m);
 }
A. 23458965, 0.000000
B. 0.000000, 23458965
C. Compilation Error
D. Runtime Error
E. None of these
Answer» B. 0.000000, 23458965
Discussion
14.

What will be the output of the following C code? (Initial values: p= 10, q = 12)
#include <stdio.h>
 void main()
 {
 float p;
 int q;
 printf("Enter two numbers: ", p);
 scanf("%f %f", &p, &q);
 printf("%f, %d", p, q);
 }
A. 10.000000, 12
B. 12, 10.000000
C. 12, Garbage value
D. Garbage value, 10.000000
E. 10.000000, Garbage value
Answer» F.
Discussion
15.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 int n = 25;
 char ch = -25;
 if (n < ch)
 {
 printf("Yes n");
 }
 else
 {
 printf("No n");
 }
 }
A. 25
B. Yes
C. No
D. Depends on the compiler
E. Depends on the standard
Answer» D. Depends on the compiler
Discussion
16.

What will be the output of the following C code on a 32-bit machine?
#include <stdio.h>
 int main()
 {
 int n = 210;
 double m = 65;
 int *ptr1 = &n;
 double *ptr2 = &m;
 printf("n and m are %d and %d", sizeof(ptr1), sizeof(ptr2));
 return 0;
 }
A. 210
B. 65
C. Depends on compiler
D. Compilation Error
E. None of these
Answer» D. Compilation Error
Discussion
17.

In the following C code, the union size is decided by?
union temp
 {
 char ch;
 int n;
 float f;
 };
A. float
B. int
C. both float and int
D. char
E. None of these
Answer» D. char
Discussion
18.

What will be the data type of the result of the following operation?
(float)p * (int)q / (long)r * (double)s
A. double
B. float
C. long
D. int
E. None of these
Answer» B. float
Discussion
19.

What will be the output of the following C code considering the size of short int is 2, char is 1 and int is 4 bytes?
#include <stdio.h>
 int main()
 {
 short int k = 23;
 char ch = 99;
 printf("%d, %d, %d n", sizeof(k), sizeof(ch), sizeof(ch + k));
 return 0;
 }
A. 23
B. 99
C. 2, 1, 4
D. 4, 1, 2
E. None of these
Answer» D. 4, 1, 2
Discussion
20.

What will be the output of the following C code on a 64 bit machine?
#include <stdio.h>
 union Stir
 {
 int num;
 char ch;
 };
 int main()
 {
 union Stir str;
 printf("%d", sizeof(str));
 return 0;
 }
A. str
B. Compilation Error
C. 4
D. All of above
E. None of these
Answer» D. All of above
Discussion
21.

What will be the output of the following C code?
#include 
 printf("%.0f", 4.89);
A. 4.890000
B. 4.89
C. 4
D. 5
E. None of these
Answer» E. None of these
Discussion
22.

What will be the output of the following C code?
#include <stdio.h>
 void main()
 {
 float num = 0.2;
 printf("%d, ", num);
 printf("%f", num);
 }
A. Garbage value, 0.200000
B. 0.200000, Garbage value
C. Compilation Error
D. Runtime Error
E. None of these
Answer» B. 0.200000, Garbage value
Discussion
23.

Which of the following is the correct output for the program given below?
#include <stdio.h>
int main ( )
{
 float floatvalue = 8.25;
 printf ("%d n " , (int) floatvalue);
 return 0;
}
A. 0
B. 0.0
C. 8.0
D. 8
Answer» E.
Discussion
24.

Which of the following is the correct datatype for the variable n in the statement given below?

n = 35.29 ;

A. float
B. double
C. long double
D. Depends upon the memory model that you are using
Answer» B. double
Discussion
25.

Which of the following is the correct output for the program given below?
#include <stdio.h>
int main ( )
{
 printf ("%d %d %d n" , sizeof(2.19f), sizeof(2.19), sizeof (2.19l));
 return 0 ;
}
A. 4 4 4
B. 4 8 8
C. 4 8 10
D. 4 8 12
Answer» C. 4 8 10
Discussion
26.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 float num = 0.2;
 if (num == 0.2f)
 {
 printf("Equal n");
 }
 else
 {
 printf("Not Equal n");
 }
 }
A. Equal
B. Not Equal
C. output depends on compiler
D. Compilation Error
E. None of these
Answer» B. Not Equal
Discussion
27.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 float fl = 15.621212121212;
 printf("%f", fl);
 }
A. 15.621212121212
B. Compilation Error
C. Garbage value
D. 15.621212
E. None of these
Answer» E. None of these
Discussion
28.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 float num1 = 0.2;
 if (num1 == 0.2)
 {
 printf("Equal n");
 }
 else
 {
 printf("Not Equal n");
 }
 }
A. Compilation Error
B. 0.2
C. Equal
D. Not Equal
E. None of these
Answer» E. None of these
Discussion
29.

Which data type is suitable for storing a number like?
25.00002500025
A. double
B. int
C. both int and double
D. float
E. None of these
Answer» B. int
Discussion
30.

What is the output of the following C code?
 #include <stdio.h>
 int main()
 {
 signed char ch;
 ch = 129;
 printf("%d n", ch);
 return 0;
 }
A. 129
B. -129
C. 127
D. -127
E. None of these
Answer» E. None of these
Discussion
31.

What will be the output of the following C code?
 #include <stdio.h>
 int main()
 {
 char ch;
 int k = 0;
 FILE *file;
 file = fopen("Example.txt", "w+");
 fprintf(file, "%c", 'I');
 fprintf(file, "%c", -1);
 fprintf(file, "%c", 'L');
 fclose(file);
 file = fopen("Example.txt", "r");
 while ((ch = fgetc(file)) != -1)
 printf("%c", ch);
 return 0;
 }
A. I
B. -1
C. L
D. Compilation Error
E. None of these
Answer» B. -1
Discussion
32.

Which of the following is the correct output for the program given below?
#include <stdio.h>
int main ( ) 
{
 float n = 5.375 ;
 printf("%f %e %E n" , n, n, n) ;
 return 0 ;
}
A. 5.375 5.375 5.375
B. 5.375000 5.375000 5.375000
C. 5.375000 5.375000e+000 5.375000E+000
D. 5.375000 5.375000E+000 5.375000e+000
Answer» D. 5.375000 5.375000E+000 5.375000e+000
Discussion
33.

What is the output of this C code?
#include <stdio.h>
int main()
{
 char chr;
 chr = 128;
 printf("%d n", chr);
 return 0;
}
A. 128
B. -128
C. Depends on the compiler
D. None of the mentioned
Answer» C. Depends on the compiler
Discussion
34.

Predict the data type of the following mathematical operation?
2 * 9 + 3 / 2 . 0
A. long
B. double
C. float
D. int
E. None of these
Answer» C. float
Discussion
35.

Which error are you likely to get when you run the following program in TC/TC++?

A. Suspicious pointer conversion
B. Floating point formats not linked
C. Cannot use scanf ( ) for structures
D. Strings cannot be nested inside structures
Answer» C. Cannot use scanf ( ) for structures
Discussion
36.

We want to round off x, a float, to an int value. The correct way to do so will be

A. y = ( int ) ( x + 0.5);
B. y = int ( x +0.5 );
C. y = ( int ) x + 0.5;
D. y = ( int ) ( ( int ) x + 0.5 )
Answer» B. y = int ( x +0.5 );
Discussion
37.

If the binary equivalent of 5.375 in normalized form is 0100 0000 1010 1100 0000 0000 0000 0000, what will be the output of the following program?

A. 40 AC 00 00
B. 04 CA 00 00
C. 00 00 AC 40
D. 00 00 CA 04
Answer» D. 00 00 CA 04
Discussion
38.

Which of the following is valid range of long double ?

A. 3.4E-4932 to 1.1E+4932
B. 3.4E-4932 to 3.4E+4932
C. 1.1E-4932 to 1.1E+4932
D. 1.7E - 308 to 1.7E + 308
Answer» E.
Discussion
39.

What is the range of a signed char variable in C?

A. 0 to 255
B. -128 to 127
C. 0 to 127
D. -128 to 255
Answer» C. 0 to 127
Discussion
40.

Which of the following is the correct datatype for the variable n in the statement given below?

A. float
B. double
C. long double
D. Depends upon the memory model that you are using
Answer» B. double
Discussion
41.

Predict the data type of the following mathematical operation?

A. long
B. double
C. float
D. int
E. None of these
Answer» C. float
Discussion
42.

Which data type is suitable for storing a number like?

A. double
B. int
C. both int and double
D. float
E. None of these
Answer» B. int
Discussion
43.

%f access specifier is used for ________.

A. Integral types
B. Floating type
C. Strings
D. All of above
E. None of these
Answer» C. Strings
Discussion
44.

In the following C code, the union size is decided by?

A. float
B. int
C. both float and int
D. char
E. None of these
Answer» D. char
Discussion
45.

What will be the data type of the result of the following operation?

A. double
B. float
C. long
D. int
E. None of these
Answer» B. float
Discussion
46.

What will be the output of the following C code considering the size of short int is 2, char is 1 and int is 4 bytes?

A. 23
B. 99
C. 2, 1, 4
D. 4, 1, 2
E. None of these
Answer» D. 4, 1, 2
Discussion
47.

function tolower(c) defined in library works for ___________.

A. Unicode character set
B. Ascii and utf-8 but not EBCDIC character set
C. Ascii character set
D. Any character set
E. None of these
Answer» E. None of these
Discussion
48.

The format identifier %i is also used for _____ data type.

A. double
B. char
C. int
D. float
E. None of these
Answer» D. float
Discussion
49.

What will be the output of the following C code? (Initial values: p= 10, q = 12)

A. 10.000000, 12
B. 12, 10.000000
C. 12, Garbage value
D. Garbage value, 10.000000
E. 10.000000, Garbage value
Answer» F.
Discussion
50.

What will be the output of the following C code on a 64 bit machine?

A. str
B. Compilation Error
C. 4
D. All of above
E. None of these
Answer» D. All of above
Discussion