Discussion
Home ‣ C Programming ‣ Control Instructions See What Others Are Saying!
- Question
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
- Correct Answer
- 6
ExplanationStep 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'.
More questions
- 1. 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'.
- 2. 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- 3. Is it necessary that the size of all elements in a union should be same?
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 4. 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
- 5. 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.- 6. 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.- 7. 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;- 8. 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".
- 9. 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.- 10. If int is 2 bytes wide.What will be the output of the program?
#include <stdio.h> void fun(char**); int main() { char *argv[] = {"ab", "cd", "ef", "gh"}; fun(argv); return 0; } void fun(char **p) { char *t; t = (p+= sizeof(int))[-1]; printf("%s\n", t); }
Options- A. ab
- B. cd
- C. ef
- D. gh Discuss
Correct Answer: cd
Explanation:
Since C is a machine dependent language sizeof(int) may return different values.The output for the above program will be cd in Windows (Turbo C) and gh in Linux (GCC).
To understand it better, compile and execute the above program in Windows (with Turbo C compiler) and in Linux (GCC compiler).
Comments
There are no comments.
More in C Programming:
Programming
Copyright ©CuriousTab. All rights reserved.
- 1. What will be the output of the program?