Quiz 1: The basics of C++

Tutorials - C++ Programming Quiz Solutions

1. What is the correct value to return to the operating system upon the successful completion of a program? A. -1 B. 1 C. 0  D. Programs do not return a value. 2. What is the only function all C++ programs must contain? A. start() B. system() C. main()  D. program() 3. What punctuation is used to signal the beginning and end of code blocks? A. { } B. -> and C. BEGIN and END D. ( and ) 4. What punctuation ends most lines of C++ code? A. . B. ; C. : D. ' 5. Which of the following is a correct comment? A. */ Comments */ B. ** Comment ** C. /* Comment */ D. { Comment } 6. Which of the following is not a correct variable type? A. float B. real C. int D. double 7. Which of the following is the correct operator to compare two variables? A. := B. = C. equal D. == Blog Author: Vijay Kumar Go to: Coding Problem Solutions, Java Aptitude

What is difference between uninitialized pointer and null pointer?

What is difference between uninitialized pointer and null pointer?  

Explanation:

An uninitialized pointer is a pointer which points unknown memory location while null pointer is pointer which points a null value or base address of segment. For example: 

int *p;   //Uninitialized pointer

int *q= (int *)0;  //Null pointer

#include<stdio.h>

int *r=NULL;   //Null pointer

What will be output of following c program?

#include<string.h>

#include<stdio.h>

int main(){

    char *p;  //Uninitialized pointer

    char *q=NULL;   //Null pointer;

    strcpy(p,"cquestion");

    strcpy(q,"cquestion");

    

    printf("%s  %s",p,q);

    return 0;

}

Output: cquestion (null)

Blog Author: Vijay Kumar

Go to: Coding Problem Solutions, Java Aptitude