File Input Output- C Programming MCQ Questions and Answers

51

Choose the correct description for control string %-+7.2f.

A) - means display the sign, + means left justify, 7 specifies the width and 2 specifies the precision B) - means left justify, + means display the sign, 7 specifies the width and 2 specifies the precision C) - means display the sign, + means left justify, 7 specifies the precision and 2 specifies the width D) - means left justify, + means display the sign, 7 specifies the precision and 2 specifies the width

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Answer & Solution

Answer: Option B

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52

What will be the output of the following C code?

#include <stdio.h>
#include <ctype.h>
int main()
{
    char c = 't';
    printf("is :%c\n", tolower('A'));
}

A) A B) a C) Non-zero number D) Zero

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Answer & Solution

Answer: Option B

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53

ungetc() is used . . . . . . . .

A) to get a char B) to get an int C) to push a character back to file D) nothing

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Answer & Solution

Answer: Option C

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54

Which mathematical function among the following does NOT require int parameters?

A) div(x, y); B) srand(x); C) sqrt(x); D) all of the mentioned

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Answer & Solution

Answer: Option C

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55

Which pre-defined function returns a pointer to the last occurence of a character in a string?

A) strchr(s, c); B) strrchr(s, c); C) strlchr(s, c); D) strfchr(s, c);

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Answer & Solution

Answer: Option B

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56

Select the correct value of i from given options i=scanf("%d %d", &a, &b);

A) 1 B) 2 C) 3 D) No value assigned

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Answer & Solution

Answer: Option B

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57

What error will generate if the read and write parameters are not separated by commas?

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

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Answer & Solution

Answer: Option B

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58

gets() and puts() operate on . . . . . . . .

A) stdin and stdout B) files C) stderr D) nothing

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Answer & Solution

Answer: Option A

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59

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    char str[11] = "hello";
    char *str1 = "world";
    strcat(str, str1);
    printf("%s %d", str, str[10]);
}

A) helloworld 0 B) helloworld anyvalue C) worldhello 0 D) Segmentation fault/code crash

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Answer & Solution

Answer: Option A

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60

Only . . . . . . . . character of pushback is guaranteed per file when ungetc is used.

A) Two B) One C) Many D) Zero

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Answer & Solution

Answer: Option B

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