File Input Output- C Programming MCQ Questions and Answers

1

What does the following C code snippet mean?

int ungetc(int c, FILE *stream)

A) pushes c back onto a stream B) deletes c from the stream C) reads frequency of c in stream D) no action is taken by the command

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Answer & Solution

Answer: Option A

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2

Which is the best way to generate numbers between 0 to 99?

A) rand()-100 B) rand()%100 C) rand(100) D) srand(100)

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Answer & Solution

Answer: Option B

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3

Which of the following is an invalid method for input?

A) scanf("%d%d%d",&a, &b, &c); B) scanf("%d %d %d", &a, &b, &c); C) scanf("Three values are %d %d %d",&a,&b,&c); D) none of the mentioned

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Answer & Solution

Answer: Option D

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4

What error will be generated on using incorrect specifier for the datatype being read?

A) compile error B) run-time error C) logical error D) no error

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Answer & Solution

Answer: Option B

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5

In C language, FILE is of which data type?

A) int B) char * C) struct D) None of the mentioned

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Answer & Solution

Answer: Option C

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6

Which types of input are accepted in toupper(c)?

A) char B) char * C) float D) Both char and char *

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Answer & Solution

Answer: Option A

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7

Which among the following is correct function call for rand() and random()?

A) rand() and random(); B) rand() and random(1); C) rand(1) and random(1); D) rand(1) and random();

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Answer & Solution

Answer: Option A

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8

what is the return value of fputs()?

A) EOF if an error occurs B) Non-negative if no error C) EOF if an error occurs & Non-negative if no error D) None of the mentioned

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Answer & Solution

Answer: Option C

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9

What will be the output of the following C code?

#include <stdio.h>
#include <stdarg.h>
int f(char c, ...);
int main()
{
    char c = 97, d = 98;
    f(c, d);
    return 0;
}
int f(char c, ...)
{
    va_list li;
    va_start(li, c);
    char d = va_arg(li, int);
    printf("%c\n", d);
    va_end(li);
}

A) Compile time error B) Undefined behaviour C) a D) b

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Answer & Solution

Answer: Option D

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10

What will be the output of the following C statement?

int sscanf(char *string, char *format, arg1, arg2, ...)

A) Scans the string according to the format in format and stores the resulting values through arg1, arg2, etc B) The arguments arg1,arg2 etc must be pointers C) Scans the string according to the format in format and stores the resulting values through arg1, arg2, etc, those arguments arg1,arg2 etc must be pointers D) None of the mentioned

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Answer & Solution

Answer: Option C

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