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- Question
Which of the following function is more appropriate for reading in a multi-word string?
Options- A. printf();
- B. scanf();
- C. gets();
- D. puts();
- Correct Answer
- gets();
Explanationgets(); collects a string of characters terminated by a new line from the standard input stream stdin#include <stdio.h> int main(void) { char string[80]; printf("Enter a string:"); gets(string); printf("The string input was: %s\n", string); return 0; }Output:
Enter a string: CuriousTab
The string input was: CuriousTab
More questions
- 1. What will the function rewind() do?
Options- A. Reposition the file pointer to a character reverse.
- B. Reposition the file pointer stream to end of file.
- C. Reposition the file pointer to begining of that line.
- D. Reposition the file pointer to begining of file. Discuss
Correct Answer: Reposition the file pointer to begining of file.
Explanation:
rewind() takes the file pointer to the beginning of the file. so that the next I/O operation will take place at the beginning of the file.
Example: rewind(FilePointer);- 2. What will be the output of the program?
#include<stdio.h> int main() { int i=0; for(; i<=5; i++); printf("%d", i); return 0; }
Options- A. 0, 1, 2, 3, 4, 5
- B. 5
- C. 1, 2, 3, 4
- D. 6 Discuss
Correct Answer: 6
Explanation:
Step 1: int i = 0; here variable i is an integer type and initialized to '0'.
Step 2: for(; i<=5; i++); variable i=0 is already assigned in previous step. The semi-colon at the end of this for loop tells, "there is no more statement is inside the loop".
Loop 1: here i=0, the condition in for(; 0<=5; i++) loop satisfies and then i is incremented by '1'(one)
Loop 2: here i=1, the condition in for(; 1<=5; i++) loop satisfies and then i is incremented by '1'(one)
Loop 3: here i=2, the condition in for(; 2<=5; i++) loop satisfies and then i is incremented by '1'(one)
Loop 4: here i=3, the condition in for(; 3<=5; i++) loop satisfies and then i is increemented by '1'(one)
Loop 5: here i=4, the condition in for(; 4<=5; i++) loop satisfies and then i is incremented by '1'(one)
Loop 6: here i=5, the condition in for(; 5<=5; i++) loop satisfies and then i is incremented by '1'(one)
Loop 7: here i=6, the condition in for(; 6<=5; i++) loop fails and then i is not incremented.
Step 3: printf("%d", i); here the value of i is 6. Hence the output is '6'.
- 3. Which of the following statements should be used to obtain a remainder after dividing 3.14 by 2.1?
Options- A. rem = 3.14 % 2.1;
- B. rem = modf(3.14, 2.1);
- C. rem = fmod(3.14, 2.1);
- D. Remainder cannot be obtain in floating point division. Discuss
Correct Answer: rem = fmod(3.14, 2.1);
Explanation:
fmod(x,y) - Calculates x modulo y, the remainder of x/y.
This function is the same as the modulus operator. But fmod() performs floating point divisions.Example:
#include <stdio.h> #include <math.h> int main () { printf ("fmod of 3.14/2.1 is %lf\n", fmod (3.14,2.1) ); return 0; }Output:
fmod of 3.14/2.1 is 1.040000- 4. Is it necessary that the size of all elements in a union should be same?
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 5. What will be the output of the program (myprog.c) given below if it is executed from the command line?
cmd> myprog one two three/* myprog.c */ #include<stdio.h> #include<stdlib.h> int main(int argc, char **argv) { printf("%s\n", *++argv); return 0; }
Options- A. myprog
- B. one
- C. two
- D. three Discuss
Correct Answer: one
- 6. A long double can be used if range of a double is not enough to accommodate a real number.
Options- A. True
- B. False Discuss
Correct Answer: True
Explanation:
True, we can use long double; if double range is not enough.double = 8 bytes.
long double = 10 bytes.- 7. If the definition of the external variable occurs in the source file before its use in a particular function, then there is no need for an extern declaration in the function.
Options- A. True
- B. False Discuss
Correct Answer: True
Explanation:
True, When a function is declared inside the source file, that function(local function) get a priority than the extern function. So there is no need to declare a function as extern inside the same source file.- 8. Point out the error, if any in the program.
#include<stdio.h> int main() { int a = 10, b; a >=5? b=100: b=200; printf("%d\n", b); return 0; }
Options- A. 100
- B. 200
- C. Error: L value required for b
- D. Garbage value Discuss
Correct Answer: Error: L value required for b
Explanation:
Variable b is not assigned.It should be like:
b = a >= 5 ? 100 : 200;- 9. What will be the output of the program?
#include<stdio.h> int main() { char ch; if(ch = printf("")) printf("It matters\n"); else printf("It doesn't matters\n"); return 0; }
Options- A. It matters
- B. It doesn't matters
- C. matters
- D. No output Discuss
Correct Answer: It doesn't matters
Explanation:
printf() returns the number of charecters printed on the console.Step 1: if(ch = printf("")) here printf() does not print anything, so it returns '0'(zero).
Step 2: if(ch = 0) here variable ch has the value '0'(zero).
Step 3: if(0) Hence the if condition is not satisfied. So it prints the else statements.
Hence the output is "It doesn't matters".Note: Compiler shows a warning "possibly incorrect assinment".
- 10. Which of the structure is correct?
1 : struct book { char name[10]; float price; int pages; };2 : struct aa { char name[10]; float price; int pages; }3 : struct aa { char name[10]; float price; int pages; }
Options- A. 1
- B. 2
- C. 3
- D. All of above Discuss
Correct Answer: 1
Explanation:
In 2 and 3 semicolon are missing in structure element.
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