1. What is the difference between the following 2 codes?
#include <stdio.h> //Program 1
int main()
{
int d, a = 1, b = 2;
d = a++ +++b;
printf("%d %d %d", d, a, b);
}
#include <stdio.h> //Program 2
int main()
{
int d, a = 1, b = 2;
d = a++ + ++b;
printf("%d %d %d", d, a, b);
}
a) No difference as space doesn’t make any difference, values of a, b, d are same in both the case
b) No difference as space doesn’t make any difference, values of a, b, d are different
c) Program 1 has syntax error, program 2 prints 4 2 3
d) Program 2 has syntax error, program 1 prints 4 2 3
Answer:c
2. What is the output of this C code?
#include <stdio.h>
int main()
{
int a = 1, b = 1, c;
c = a++ + b;
printf("%d, %d", a, b);
}
a) a = 1, b = 1
b) a = 2, b = 1
c) a = 1, b = 2
d) a = 2, b = 2
Answer:b
3. What is the output of this C code?
#include <stdio.h>
int main()
{
int a = 1, b = 1, d = 1;
printf("%d, %d, %d", ++a + ++a+a++, a++ + ++b, ++d + d++ + a++);
}
a) 15, 4, 5
b) 9, 6, 9
c) 9, 3, 5
d) 6, 4, 6
Answer:a
4. For which of the following, “PI++;” code will fail?
a) #define PI 3.14
b) char *PI = “A”;
c) float PI = 3.14;
d) Both (A) and (B)
5. What is the output of this C code?
#include <stdio.h>
int main()
{
int a = 10, b = 10;
if (a = 5)
b--;
printf("%d, %d", a, b--);
}
a) a = 10, b = 9
b) a = 10, b = 8
c) a = 5, b = 9
d) a = 5, b = 8
Answer:c
6. What is the output of this C code?
#include <stdio.h>
int main()
{
int i = 0;
int j = i++ + i;
printf("%d\n", j);
}
a) 0
b) 1
c) 2
d) Compile time error
Answer:a
7. What is the output of this C code?
#include <stdio.h>
int main()
{
int i = 2;
int j = ++i + i;
printf("%d\n", j);
}
a) 6
b) 5
c) 4
d) Compile time error
Answer:a
8. Comment on the output of this C code?
#include <stdio.h>
int main()
{
int i = 2;
int i = i++ + i;
printf("%d\n", i);
}
a) = operator is not a sequence point
b) ++ operator may return value with or without side effects
c) it can be evaluated as (i++)+i or i+(++i)
d) Both a and b
Answer:a
9. What is the output of this C code?
#include <stdio.h>
int main()
{
int c = 2 ^ 3;
printf("%d\n", c);
}
a) 1
b) 8
c) 9
d) 0
Answer: a
10. What is the output of this C code?
#include <stdio.h>
int main()
{
unsigned int a = 10;
a = ~a;
printf("%d\n", a);
}
a) -9
b) -10
c) -11
d) 10
Answer:c
11. What is the output of this C code?
#include <stdio.h>
int main()
{
if (7 & 8)
printf("Honesty");
if ((~7 & 0x000f) == 8)
printf("is the best policy\n");
}
a) Honesty is the best policy
b) Honesty
c) is the best policy
d) No output
Answer:c
12. What is the output of this C code?
#include <stdio.h>
int main()
{
int a = 2;
if (a >> 1)
printf("%d\n", a);
}
a) 0
b) 1
c) 2
d) No Output.
Answer:c
13. Comment on the output of this C code?
#include <stdio.h>
int main()
{
int i, n, a = 4;
scanf("%d", &n);
for (i = 0; i < n; i++)
a = a * 2;
}
a) Logical Shift left
b) No output
c) Arithmetic Shift right
d) bitwise exclusive OR
Answer:b
14. What is the output of this C code?
#include <stdio.h>
void main()
{
int x = 97;
int y = sizeof(x++);
printf("x is %d", x);
}
a) x is 97
b) x is 98
c) x is 99
d) Run time error
Answer:a
15. What is the output of this C code?
#include <stdio.h>
void main()
{
int x = 4, y, z;
y = --x;
z = x--;
printf("%d%d%d", x, y, z);
}
a) 3 2 3
b) 2 2 3
c) 3 2 2
d) 2 3 3
Answer:d
16. What is the output of this C code?
#include <stdio.h>
void main()
{
int x = 4;
int *p = &x;
int *k = p++;
int r = p - k;
printf("%d", r);
}
a) 4
b) 8
c) 1
d) Run time error
Answer:c
17. What is the output of this C code?
#include <stdio.h>
int main()
{
int i = -3;
int k = i % 2;
printf("%d\n", k);
}
a) Compile time error
b) -1
c) 1
d) Implementation defined
Answer:b
18. What is the output of this C code?
#include <stdio.h>
int main()
{
int i = 3;
int l = i / -2;
int k = i % -2;
printf("%d %d\n", l, k);
return 0;
}
a) Compile time error
b) -1 1
c) 1 -1
d) Implementation defined
Answer:b
19. What is the output of this C code?
#include <stdio.h>
int main()
{
int i = 5;
i = i / 3;
printf("%d\n", i);
return 0;
}
a) Implementation defined
b) 1
c) 3
d) Compile time error
Answer:b
20. What is the output of this C code?
#include <stdio.h>
int main()
{
int i = -5;
i = i / 3;
printf("%d\n", i);
return 0;
}
a) Implementation defined
b) -1
c) -3
d) Compile time error
Answer:b
21. What is the value of x in this C code?
#include <stdio.h>
void main()
{
int x = 5 * 9 / 3 + 9;
}
a) 3.75
b) Depends on compiler
c) 24
d) 3
Answer:c
22. What is the output of this C code?
#include <stdio.h>
void main()
{
int x = 5.3 % 2;
printf("Value of x is %d", x);
}
a) Value of x is 2.3
b) Value of x is 1
c) Value of x is 0.3
d) Compile time error
Answer:d
23. What is the output of this C code?
#include <stdio.h>
void main()
{
int y = 3;
int x = 5 % 2 * 3 / 2;
printf("Value of x is %d", x);
}
a) Value of x is 1
b) Value of x is 2
c) Value of x is 3
d) Compile time error
Answer:a
24. 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
Answer:d
25. The format identifier ‘%i’ is also used for _____ data type?
a) char
b) int
c) float
d) double
Answer:b
26. Which data type is most suitable for storing a number 65000 in a 32-bit system?
a) short
b) int
c) long
d) double
Answer:a
27. 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:d
28. 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:c
29. 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:b
30. 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
Answer:a
31. Which of the following is not a valid variable name declaration?
a) int _a3;
b) int a_3;
c) int 3_a;
d) int _3a
Answer:c
Explanation:Variable name cannot start with a digit.
32. Which of the following is not a valid C variable name?
a) int number;
b) float rate;
c) int variable_count;
d) int $x;
ans :d
explanation:
White spaces and special symbols(!,@,#,$,^,&) are not allowed except underscore( _ ) .
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:b
34. 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
Answer:c