C Interview Questions

For example, the command line gcc -o myprog myprog.c would result in the following values internal to GCC: "c argc 4 argv[0] gcc argv[1] -o argv[2] myprog argv[3] myprog.c ...

The answer is a) r as argv[1] is friday
and argv[0] is myprog

First, count up the number of digits in the candidate value; an easy way to do this is take the floor value of the log of the number and add 1 (for example, floor(log10(1234)) = 3, so 3 + 1 = 4 digits...

"c start Accept num noOfDigit=calculate number of digits //use counting digit function while(num!=0) { remainder=inum%10; sum=sum+pow(remainder,noOfDigit); //use power func...

The behavior is undefined; the arguments to printf aren't guaranteed to be evaluated in any particular order. The *result* of each expression is guaranteed to be passed in the order specified, but th...

1 20 20

the answer is 4. because range of char is -128 to 127 so at 140 it get considered as 127,-128,-127,-126,....,-116.
so 120+(-116)=4

260

max and min program without semicolon

Code
#include<stdio.h><br /><br />void main()<br /><br /> {<br /><br />   if(printf("no semicolon"))<br /><br /> {}<br /><br /> }

1.union allocates the memory equal to the maximum memory required by the member of union,Structure allocate the memory to the total memory required by the member.

2. in union one block is used by all member of union,in structure each member have their own memory space

All the members of the structure can be accessed at once,where as in an union only one member can be used at a time. Another important difference is in the size allocated to a structure and an union. ...

thrashing means "high pagefaultservice time ",bcoz of that reason the operating system can applying pagereplacement algorithms are very highly,i.e(processor busy with executing pagereplacement algorithms rather than executing userinstructions

Thrashing is caused by under allocation of the minimum number of pages required by a process, forcing it to continuously page fault. The system can detect thrashing by evaluating the level of CPU util...

Here the 1st answer is 22 and second is 15 because in case of ++a + ++a + ++a then 1st increment then addition let temp=(++a + ++a)==7+7=14 and then ++a =14+8=22
and for 2nd case 5+5+5=15.

C is a high-level language because it abstracts away a large part of the underlying machine; instead of dealing with registers and opcodes, youre dealing with objects and expressions. Streams are abs...

In the first case it gives answer 22 because it form a tree like structure and start from bottom i.e ++a and ++a in first ++a=6 and in the 2nd time ++a=7 and again aad take max[6,7] in the case of re-...

in the first case: a=5; c= ++a + ++a + ++a; now in first pre increment the value of a will be 6 and after 1st pre-increment the value in secont pre-increment statement will be 7, so that the value in ...

why does ++x * ++x give 49 when x=5? If you directly give this in printf stmt it gives you the result as 42,7 x=5 printf("%d %d ",++x * ++x,x) But if you assign this to some vari...

it increments i by 1i.e i becomes 6 in first subexpression and becomes in 7 in second subexpression.finally 42 is answer

Code
#include<conio.h>
#include<iostream>
 
using namespace std;
 
int value(int a);
 
int main ()
{
    int a, num, count=0;
    
     cout<<"How many values: ";
     cin>>num;
    
    getch ();
    
    
    
int value(int a);
    
    
    for (a=1;a<=num;a++)
    {
    
        cout<<"Enter value "<<a<<": ";
        cout<<endl;
        }
        
        
        getch ();
        return 0;
        }
        
 

#include <stdio.h>main(){   int a[] = { 1,-3,-5,-4,-9,2,8};   int len,i,val;   int npos=0, nneg=0;   len = sizeof(a)/sizeof(a[0]);   printf(&quo...

Code
#include<conio.h>
#include<stdio.h>
#include<math.h>
main()
{
    int a,b,num,i;
    printf("enter the number ");
    scanf("%d",&a);
    printf("enter the number  in power");
    scanf("%d" , &b);
  num = pow(a,b);
  
   printf("%d" , num);
    getch();
}

main() {        scanf("%d",&a); // base         scanf("%d",&b); //power  &nbs...

return to the next executive statement

The Break statement can be simulated by using the "goto" statements.The exit statement is used for exiting the program and the return statement is for returning to the calling function. So b...

Code for fibonacci series

Code
#include<stdio.h>
void main(){
int i=0,j=1,sum=0,num;
printf("enter the size of the series");
scanf("%d",&num);
while(sum<num){
printf("%d",sum);
i=j;
j=sum;
sum=i+j;
}
getch();
}
 

Code
#include<stdio.h>
#include<conio.h>
void main()
{
int pre=0,next=1,sum=0,n;
clrscr();
printf("enter the value of n:");
scanf("%d",&n);
while(pre<=n)
{
printf("the fibonacci series; %d
",pre);
sum=pre+next;
pre=next;
next=sum;
}
getch();
}

The following handles up to 32-bit integer values. Not the prettiest code in the world, but it works pretty well. Sample output: [fbgo448@n9dvap997]~/prototypes/numbers: ./numbers 1 one [fbgo448@n9...

"c #include #include void pw(long,char[]); char *one[]={" "," one"," two"," three"," four"," five"," six"," seven","eight"," Nine"," ten"," eleven"," twelve"," thirteen"," fourteen...

You need to check that temp isnt null after the call to strtok() in the loop. See the attachment for a fix.

Code
temp = strtok(NULL, " ");
 
if (temp != NULL && strstr(temp1,temp) == NULL)

wild pointer is a pointer which has not been initialized i.e point to nothing

A pointer which does not hold any valid address is called wild pointer

cprintf outputs to the console device.
fprintf outputs to a stream specified by the 1st parameter.

printf outputs to the standard output stream (stdout)

fprintf goes to a file handle (FILE*)

sprintf goes to a buffer you allocated. (char*)