Input and Output Statements

Which among the following is the odd one out?
1. printf
2. fprintf
3. putchar
4. scanf
For a typical program, the input is taken using _________
1. scanf
2. Files
3. Command-line
4. All of the mentioned
What does the following command line signify?

prog1|prog2
1. It runs prog1 first, prog2 second
2. It runs prog2 first, prog1 second
3. It runs both the programs, pipes output of prog1 to input of prog2
4. It runs both the programs, pipes output of prog2 to input of prog1
What is the default return-type of getchar()?
1. char
2. int
3. char *
4. reading character doesn’t require a return-type
What is the value of EOF?
1. -1
2. 0
3. 1
4. 10
What is the use of getchar()?
1. The next input character each time it is called
2. EOF when it encounters end of file
3. The next input character each time it is called EOF when it encounters end of file
4. None of the mentioned
Which of the following statement is true?
1. The symbolic constant EOF is defined in
2. The value is -1
3. The symbolic constant EOF is defined in & value is -1
4. Only value is -1
What is the return value of putchar()?
1. The character written
2. EOF if an error occurs
3. Nothing
4. Both character written & EOF if an error occurs
Which is true about function tolower?
1. The function tolower is defined in
2. Converts an uppercase letter to lowercase
3. Returns other characters untouched
4. None of the mentioned
What will be the output of the following C code?

#include
int main()
{
char c = '�';
putchar(c);
}
1. Compile time error
2. Nothing
3. 0
4. Undefined behaviour
putchar(c) function/macro always outputs character c to the __________
1. screen
2. standard output
3. depends on the compiler
4. depends on the standard
What will be the output of the following C code if following commands are used to run (considering myfile exists)?

gcc -otest test.c
./test < myfile

#include
int main()
{
char c = 'd';
putchar(c);
}
1. Compile time error (after first command)
2. d in the myfile file
3. d on the screen
4. Undefined behaviour
What will be the output of the following C code if following commands are used to run (considering myfile exists)?
gcc -otest test.c
./test > myfile

#include
int main(int argc, char **argv)
{
char c = 'd';
putchar(c);
printf(" %d\n", argc);
}
1. d 2 in myfile
2. d 1 in myfile
3. d in myfile and 1 in screen
4. d in myfile and 2 in screen
What will be the output of the following C code if following commands are used to run and if myfile does not exist?

gcc -o test test.c
./test > myfile

#include
int main(int argc, char **argv)
{
char c = 'd';
putchar(c);
printf(" %d\n", argc);
}
1. d 2 in myfile
2. d 1 in myfile
3. Depends on the system
4. Depends on the standard
The statement prog < infile causes _________
1. prog to read characters from infile
2. prog to write characters to infile
3. infile to read characters from prog instead
4. nothing
What will be the output of the following C code?
#include
int main()
{
int i = 10, j = 2;
printf("%d\n", printf("%d %d ", i, j));
}
1. Compile time error
2. 10 2 4
3. 10 2 2
4. 10 2 5
What will be the output of the following C code?

#include
int main()
{
int i = 10, j = 3;
printf("%d %d %d", i, j);
}
1. Compile time error
2. 10 3
3. 10 3 some garbage value
4. Undefined behaviour
What will be the output of the following C code?

#include
int main()
{
int i = 10, j = 3, k = 3;
printf("%d %d ", i, j, k);
}
1. Compile time error
2. 10 3 3
3. 10 3
4. 10 3 somegarbage value
What will be the output of the following C code?
#include
int main()
{
char *s = "myworld";
int i = 9;
printf("%*s", i, s);
}
1. myworld
2. myworld(note: spaces to the left of myworld)
3. myworld (note:followed by two spaces after myworld)
4. Undefined
What will be the output of the following C code?

#include
int main(int argc, char** argv)
{
char *s = "myworld";
int i = 3;
printf("%10.*s", i, s);
}
1. myw(note:7 spaces before myw)
2. myworld(note:2 spaces before myworld)
3. myworld (note:2 spaces after myworld)
4. myw(note:6 spaces after myw)
What is the difference between %e and %g?
1. %e output formatting depends on the argument and %g always formats in the format [-]m.dddddd or [-]m.dddddE[+|-]xx where no.of ds are optional
2. %e always formats in the format [-]m.dddddd or [-]m.dddddE[+|-]xx where no.of ds are optional and output formatting depends on the argument
3. No differences
4. Depends on the standard
Escape sequences are prefixed with ________
1. %
2. /
3. ”
4. None of the mentioned
What is the purpose of sprintf?
1. It prints the data into stdout
2. It writes the formatted data into a string
3. It writes the formatted data into a file
4. None of the mentioned
he syntax to print a % using printf statement can be done by ________
1. %
2. \%
3. ‘%’
4. %%

Input and Output Statements

Quiz