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Instruction:
Total number of questions : 20 .
Time alloted : 20 minutes.
Each question carry 1 mark, no negative marks.
1.
How many times the while loop will get executed if a short int is 2 byte wide?
#include<stdio.h>
int main()
{
int j=1;
while(j <= 255)
{
printf("%c %d\n", j, j);
j++;
}
return 0;
}
Answer: B
Explanation:
The while(j <= 255) loop will get executed 255 times. The size short int(2 byte wide) does not affect the while() loop.
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2.
Which of the following errors would be reported by the compiler on compiling the program given below?
#include<stdio.h>
int main()
{
int a = 5;
switch(a)
{
case 1:
printf("First");
case 2:
printf("Second");
case 3 + 2:
printf("Third");
case 5:
printf("Final");
break;
}
return 0;
}
Answer: C
Explanation:
Because, case 3 + 2: and case 5: have the same constant value 5.
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3.
Point out the error, if any in the program.
#include<stdio.h>
int main()
{
int P = 10;
switch(P)
{
case 10:
printf("Case 1");
case 20:
printf("Case 2");
break;
case P:
printf("Case 2");
break;
}
return 0;
}
Answer: B
Explanation:
The compiler will report the error "Constant expression required" in the line case P: . Because, variable names cannot be used with case statements.
The case statements will accept only constant expression.
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4.
What will be the output of the program?
#include<stdio.h>
int main()
{
int i=2;
printf("%d, %d\n", ++i, ++i);
return 0;
}
Answer: D
Explanation:
The order of evaluation of arguments passed to a function call is unspecified.
Anyhow, we consider ++i, ++i are Right-to-Left associativity. The output of the program is 4, 3.
In TurboC, the output will be 4, 3.
In GCC, the output will be 4, 4.
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5.
In the expression a=b=5 the order of Assignment is NOT decided by Associativity of operators
Answer: B
Explanation:
The equal to = operator has Right-to-Left Associativity. So it assigns b=5 then a=b .
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6.
What is the notation for following functions?
1. int f(int a, float b)
{
/* Some code */
}
2. int f(a, b)
int a; float b;
{
/* Some code */
}
Answer: C
Explanation:
KR Notation means Kernighan and Ritche Notation.
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7.
How many times the program will print "IndiaBIX" ?
#include<stdio.h>
int main()
{
printf("IndiaBIX");
main();
return 0;
}
Answer: D
Explanation:
A call stack or function stack is used for several related purposes, but the main reason for having one is to keep track of the point to which each active subroutine should return control when it finishes executing.
A stack overflow occurs when too much memory is used on the call stack.
Here function main() is called repeatedly and its return address is stored in the stack. After stack memory is full. It shows stack overflow error.
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8.
What will be the output of the program?
#include<stdio.h>
#define SQR(x)(x*x)
int main()
{
int a, b=3;
a = SQR(b+2);
printf("%d\n", a);
return 0;
}
Answer: B
Explanation:
The macro function SQR(x)(x*x) calculate the square of the given number 'x' . (Eg: 102 )
Step 1 : int a, b=3; Here the variable a, b are declared as an integer type and the variable b is initialized to 3.
Step 2 : a = SQR(b+2); becomes,
=> a = b+2 * b+2; Here SQR(x) is replaced by macro to x*x .
=> a = 3+2 * 3+2;
=> a = 3 + 6 + 2;
=> a = 11;
Step 3 : printf("%d\n", a); It prints the value of variable 'a'.
Hence the output of the program is 11
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9.
A preprocessor directive is a message from programmer to the preprocessor.
Answer: A
Explanation:
True, the programmer tells the compiler to include the preprocessor when compiling.
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10.
What will be the output of the program ?
#include<stdio.h>
int main()
{
char *p;
p="hello";
printf("%s\n", *&*&p);
return 0;
}
11.
How will you free the allocated memory ?
12.
In a file contains the line "I am a boy\r\n" then on reading this line into the array str using fgets() . What will str contain?
Answer: C
Explanation:
Declaration : char *fgets(char *s, int n, FILE *stream);
fgets reads characters from stream into the string s . It stops when it reads either n - 1 characters or a newline character, whichever comes first.
Therefore, the string str contain "I am a boy\n\0"
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13.
Which files will get closed through the fclose() in the following program?
#include<stdio.h>
int main()
{
FILE *fs, *ft, *fp;
fp = fopen("A.C", "r");
fs = fopen("B.C", "r");
ft = fopen("C.C", "r");
fclose(fp, fs, ft);
return 0;
}
Answer: D
Explanation:
Extra parameter in call to fclose().
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14.
If the file 'source.txt' contains a line "Be my friend" which of the following will be the output of below program?
#include<stdio.h>
int main()
{
FILE *fs, *ft;
char c[10];
fs = fopen("source.txt", "r");
c[0] = getc(fs);
fseek(fs, 0, SEEK_END);
fseek(fs, -3L, SEEK_CUR);
fgets(c, 5, fs);
puts(c);
return 0;
}
Answer: C
Explanation:
The file source.txt contains "Be my friend".
fseek(fs, 0, SEEK_END); moves the file pointer to the end of the file.
fseek(fs, -3L, SEEK_CUR); moves the file pointer backward by 3 characters.
fgets(c, 5, fs); read the file from the current position of the file pointer.
Hence, it contains the last 3 characters of "Be my friend".
Therefore, it prints "end".
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15.
According to ANSI specifications which is the correct way of declaring main when it receives command-line arguments?
16.
What will be the output of the program (myprog.c) given below if it is executed from the command line?myprog one two three
/* myprog.c */
#include<stdio.h>
#include<stdlib.h>
int main(int argc, char **argv)
{
printf("%s\n", *++argv);
return 0;
}
17.
Point out the correct statement which correctly allocates memory dynamically for 2D array following program?
#include<stdio.h>
#include<stdlib.h>
int main()
{
int *p, i, j;
/* Add statement here */
for(i=0; i<3; i++)
{
for(j=0; j<4; j++)
{
p[i*4+j] = i;
printf("%d", p[i*4+j]);
}
}
return 0;
}
18.
malloc() allocates memory from the heap and not from the stack.
19.
Point out the error in the following program.
#include<stdio.h>
#include<stdarg.h>
void display(char *s, ...);
int fun1();
int fun2();
int main()
{
int (*p1)();
int (*p2)();
p1 = fun1;
p2 = fun2;
display("IndiaBIX", p1, p2);
return 0;
}
void display(char *s, ...)
{
int (*pp1)();
int (*pp2)();
va_list ptr;
va_start(ptr, s);
pp1 = va_arg(ptr, int(*)());
(*pp1)();
pp2 = va_arg(ptr, int(*)());
(*pp2)();
}
int fun1()
{
printf("Hello");
}
int fun2()
{
printf("Hi");
}
20.
What do the following declaration signify?
int (*ptr)[30];
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