INDEX
Topic 1 Good questions of preprocessorTopic 2 What is preprocessor? Topic 3 Why preprocessor in c programming language? Topic 4 List all preprocessor directives. Topic 5 Explain macro substitution directive?Topic 6 File inclusion directive or #include directive?Topic 8 # and ## operatorTopic 9 #pragmaTopic 10 #pragma inlineTopic 11 #pragma warnTopic 12 #pragma startup and #
Sunday, 2 December 2007
Structure questions with answer and explanations in c language
INDEX
Topic 1 Good questions of structure with explanation
Topic 1 Good questions of structure with explanation
Wednesday, 7 November 2007
Frequently asked questions of c programming with answer
Using only c programming language
check given number is prime number or not using
check the given number is armstrong number or not
check the given number is palindrome number or not
CHECKING LEAP YEAR
CHECK STRING IS PALINDROME OR NOT
PASSING ONE-DIMENSIONAL ARRAY TO A FUNCTION
CREATE A FILE AND STORE DATA IN IT
TO PASSING 2-DIMENSIONAL ARRAY TO A FUNCTION
WRITING OF STRINGS TO A FILE
check given number is prime number or not using
check the given number is armstrong number or not
check the given number is palindrome number or not
CHECKING LEAP YEAR
CHECK STRING IS PALINDROME OR NOT
PASSING ONE-DIMENSIONAL ARRAY TO A FUNCTION
CREATE A FILE AND STORE DATA IN IT
TO PASSING 2-DIMENSIONAL ARRAY TO A FUNCTION
WRITING OF STRINGS TO A FILE
Thursday, 13 September 2007
C best coding questions with answer
(q) What will be output of the following program ? #include"stdio.h" void main(){ long double a=55555; clrscr(); printf("%.2LE,%.2Le",a); getch(); } output:5.56E+04,5.56e+04 %e or %E represent print the number in exponential format. %e means output has small letter e. %E means output has capital letter e. (q) What will be output of the following program ? #include"
C best language questions and answer
(q) What will be output of the following program ? #include"stdio.h" void main(){ char a='\377'; clrscr(); printf(2+"%d%o",a); getch(); } output:177777 Explanation: ‘\377’ is octal character constant. %o is used to print octal number system. (q) What will be output of the following program ? #include"stdio.h" void main(){ char a='\378'; clrscr(); printf("%o",a);
C coding good questions and answer
C coding good questions and answer
(1) What
will be output of the following code?
#include"stdio.h"
void main(){
char
a='\\';
clrscr();
a=a-'/';
printf("%d",a);
getch();
}
Output: error
Explanation:
Character is \ has special meaning
in c programming. For example:
‘\0’ represents octal character.
‘\n’ represents new line character.
So we cannot use ‘\’ directly.
(2
C good questions and answer
Good questions in c programming language.
(1) What will be output
of the following program?
void main(){
enum data{a,b,c};
clrscr();
printf("%i %i %i",a,b,c);
getch();
}
Output: 0 1 2
Explanation:
By default initial
value of first enum constant is zero. Value of next enum constant
will be:
Next_enum_constant_value=previous_enum_constant_value+1
(2) What will be output
of
good questions of c with answer
Volatile modifier keyword
questions in c programming language:
(q) What will be output of the
following program?
void main()
{
volatile a=5;
a=~a+ ++a;
clrscr();
printf("%d",a);
getch();
}
Output: -1
Explanation:
Volatile variable can be modifying by interrupt or other
process in preprocessor. So in normal output will not affect.
Note. ~ is one’s complement operator
(q) What
Saturday, 1 September 2007
Properties of constructor in c++ with example
Properties of constructor:
(1) Constructor is special type function which must has same name of class name.
(2) Constructor doesn’t return any data type even void
Example:
#include
#include
class school
{
char *name;
int capacity;
public:
void school();
void display()
{
cout<
#include
class math
{
int a;
float b;
public:
math(int p,float q) //constructor should be in
(1) Constructor is special type function which must has same name of class name.
(2) Constructor doesn’t return any data type even void
Example:
#include
#include
class school
{
char *name;
int capacity;
public:
void school();
void display()
{
cout<
#include
class math
{
int a;
float b;
public:
math(int p,float q) //constructor should be in
Why constructor in c++
(q) Why constructor ?
Ans:
Goal of c++ is to create such type of class which is very similar to basic data type like int
char,float etc.
It is possible in basic data type like int,char etc we can initialize the data type at the
time of creation .
Example:
#include
#include
int main()
{
int a=6; //intialization at the time
char b='v'; // of creation
Ans:
Goal of c++ is to create such type of class which is very similar to basic data type like int
char,float etc.
It is possible in basic data type like int,char etc we can initialize the data type at the
time of creation .
Example:
#include
#include
int main()
{
int a=6; //intialization at the time
char b='v'; // of creation
What is printf in c or prototype of printf with example
(q) What is prototype of printf function? Explain each term.
Answer:
Prototype of printf function is:
int printf( const char *format ,…)
Explanation of each term:
Parameter of printf function is:
(1) … (Three continuous dots): It is called ellipsis. It indicates the variable number of arguments.
Example of ellipsis:
void ellipsis(int a,...);
void main()
{
int a=5,b=10;
Tuesday, 28 August 2007
SUM OF ARRAY
WAP to sum of five elements of an array
void main ()
{
int no[5],i,sum;
clrscr ();
for (i=0;i<=4;i++)
{
printf ("Enter Element: ");
scanf ("%d",&no[i]);
}
sum=no[0]+no[1]+no[2]+no[3]+no[4];
printf ("\nSum of five Elements: %d",sum);
getch ();
}
PASSWORD VERIFICATION
WAP to print the detail of the programmer
if the given number is 464
void main ()
{
int pass;
clrscr();
do
{
printf ("Enter Password to see the detail of programmer:\n");
scanf ("%d",&pass);
}
while (pass!=464);
printf ("\nJagjeet Singh");
printf ("\nB.Sc. (I.T.)\nPunjab
getch ();
}
PRINT STARS
WAP to print Stars on screen
void main ()
{
int i,j;
clrscr();
for (j=1;j<4;j++)
{
for (i=1;i<=5;i++)
{
printf ("*");
}
printf ("\n");
}
getch ();
}
SKIP 5 & 7
WAP to print series from 1 to 10 and skip 5 & 7
void main ()
{
int a;
clrscr ();
for (a=1;a<=10;a++)
{
if (a==5 || a==7)
continue;
printf ("%d\n",a);
}
getch ();
}
SERIES BREAK ON 5
WAP to print series from 1 to 10 and break on 5
void main ()
{
int a;
clrscr ();
for (a=1;a<=10;a++)
{
if (a==5)
break;
printf ("%d\n",a);
}
getch ();
}
ENTER & DISPLAY
WAP to print name and display on screen
void main ()
{
char name [15];
clrscr ();
printf ("Enter your name: ");
gets (name);
printf ("\nme is: %s",name);
getch ();
}
ASCII CODE - 0 TO 255
WAP to print ASCII code from 0 to 255
void main ()
{
int i=0,count=0;
clrscr ();
for(i=0;i<=255;i++)
{
if (count>24)
{count=0;getch();}
else
{printf("%d=%c\n",i,i);
count++;}
}
getch ();
}
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STRING LENGTH
WAP to find the length of any string
void main ()
{
char ch [20];
int l;
clrscr ();
printf ("Enter String: ");
gets (ch);
l=strlen(ch);
printf ("Length of string is %d",l);
getch ();
}
FIND STRING
WAP to find string within a string
void main ()
{
char *k="Borland International", *g, *p;
clrscr ();
printf ("Enter string to find: ");
gets (g);
p=strstr(k,g);
printf ("%s",p);
getch ();
}
UPPER, LOWER AND REVERSE
WAP to find length of string and show it in upper, lower and reverse order
void main ()
{
char str [20];
clrscr ();
printf ("Enter your name: ");
gets (str);
printf("\nLength is : %d",strlen(str));
printf("\nUpper is : %s",strupr(str));
printf("\nLower is : %s",strlwr(str));
printf("\nReverese is : %s",strrev(str));
getch ();
}
GOOD ELSE BAD
WAP to find if number=10 then Good else Bad
void main ()
{
int a;
clrscr ();
printf ("Enter any Number: ");
scanf ("%d",&a);
if (a==10)
goto g;
else
goto b;
g:
printf ("Good");
goto end;
b:
printf ("Bad");
goto end;
end:
getch ();
}
RECORDS ENTRY
WAP to enter records and also repeat the step if user wants to continue
void main ()
{
char nm [20],cls[10];
int rollno,m1,m2,m3,tm;
float per;
char ch;
clrscr ();
do
{
printf ("\nEnter Marks of Hindi: ");
scanf ("%d",&m1);
printf ("Enter Marks of Pbi : ");
scanf ("%d",&m2);
printf ("Enter Marks of Math : ");
scanf ("%d",&m3);
tm=m1+m2+m3;
per=(tm*100)/300;
printf ("\nTotal Marks are %d",tm);
printf ("\nPercentage is %.2f",per);
printf ("\nDo you want to continue Y/N: ");
fflush(stdin);
scanf ("%c",&ch);
}
while (ch=='y' || ch=='Y');
getch ();
}
GETCH ( ) FUNCTION
WAP to enter character by using getch ( ) function
#include
void main ()
{
char ch;
clrscr ();
printf ("Enter any character: ");
ch=getch();
printf ("You have pressed %c",ch);
getch ();
}
MATRIX 2 X 3
WAP to create double dimension array of 2x3 matrix and display its Elements
void main ()
{
int a[2][3],i,j;
clrscr ();
for (i=0;i<2;i++)
{
for (j=0;j<3;j++)
{
printf ("\nEnter element: ");
scanf ("%d",&a[i][j]);
}
}
for (i=0;i<2;i++)
{
for (j=0;j<3;j++)
{
printf ("%d\t",a[i][j]);
}
printf ("\n");
}
getch ();
}
NUMBER OF VOWELS
WAP to count number of vowels
void main ()
{
char s[20],vw=0,i;
clrscr();
printf ("Enter any string: ");
gets (s);
for (i=0;i<=strlen(s);i++)
{
switch (s[i])
{
case 'a':
case 'e':
case 'i':
case 'o':
case 'u':
case 'A':
case 'E':
case 'I':
case 'O':
case 'U':
vw++;
}
}
printf ("There are %d vowels in it",vw);
getch ();
}
CONCATENATE TWO STRINGS
WAP to concatenate two strings
void main ()
{
char *str,*str1;
clrscr ();
printf("Enter your name: ");
gets (str);
str1="jeet";
strcat(str,str1);
printf("\n %s",str);
getch ();
}
SWITCH CASE
WAP to find amount of given quantity of any company with 10% discount using switch case
void main()
{
int,ch qty;
long tb,dis,nb;
clrscr();
printf("1.BPL\n2.Onida\n3.Sony\n4.Samsung\n5.LG\n");
printf("\nEnter Your Choice: ");
fflush(stdin);
scanf("%d",&ch);
printf("Enter Qty: ");
scanf("%d",&qty);
switch(ch)
{
case 1:tb=(long)qty*10000;
printf("\nBPL is %ld",tb);
break;
case 2:tb=(long)qty*12000;
printf("\nOnida is %ld",tb);
break;
case 3:tb=(long)qty*11500;
printf("\nSony is %ld ",tb);
break;
case 4:tb=(long)qty*11000;
printf("\nSamsung is %ld ",tb);
break;
case 5:tb=(long)qty*13000;
printf("\nLG is %ld ",tb);
break;
Default:
printf("Wrong Choice...");
}
dis=(tb*10)/100;
nb=tb-dis;
printf("\nDiscount is %ld",dis);
printf("
\nNet bill is %ld",nb);
getch();
}
SIZE OF VARIABLE
WAP to find size of any variable
void main()
{
int a;
float b;
double c;
char ch;
long d;
char nm[10];
clrscr();
printf("\nInt size is \t:%d", sizeof (a));
printf("\nFloat size is \t:%d", sizeof (b));
printf("\nDouble size is \t:%d", sizeof (c));
printf("\nChar size is \t:%d", sizeof (ch));
printf("\nLong size is \t:%d", sizeof (d));
printf("\nString size is \t:%d", sizeof (nm));
getch ();
}
FACTORIAL NUMBER
WAP to find the factorial of the number
void main ()
{
int fact=1,no;
clrscr();
printf ("Enter any number: ");
scanf ("%d",&no);
do
{
fact=fact*no;
no--;
}
while (no>0);
printf ("\nFactorial is %d",fact);
getch ();
}
PRINT SERIES (VARIABLE)
WAP to print series from start to end using do-while loop
void main ()
{
int a,b;
clrscr ();
printf ("Enter Start: ");
scanf ("%d",&a);
printf ("Enter End: ");
scanf ("%d",&b);
do
{
printf ("%d\n",a);
a++;
}
while (a<=b);
getch ();
}
PRINT NAME 10 TIMES
WAP to print any name on screen 10 times
void main ()
{
int a=1;
clrscr();
do
{
printf ("Jagjeet\n");
a++;
}
while (a<=10);
getch ();
}
PRIME NUMBER
WAP to find that number is
void main ()
{
int no,i=2;
clrscr ();
printf ("Enter Number: ");
scanf ("%d",&no);
while (i<=no)
{
if (no%i==0)
break;
i++;
}
if (i==no)
printf ("Number is Prime");
else
printf ("Number is not Prime");
getch ();
}
SQUARE & CUBE
WAP to print series from 1 to 10 & find its
void main ()
{
int a=1,sqr=0,cube=0;
clrscr ();
while (a<=10)
{
sqr=pow(a,2);
cube=pow(a,3);
printf ("%d\t %d\t %d\n",a,sqr,cube);
a++;
}
getch ();
}
FABBONIC SERIES
WAP to print fabbonic series from 1 to 55
void main ()
{
int a,b,c;
clrscr ();
a=0;b=1;c=1;
printf ("%d\n%d",a,b);
while (c<55)
{
c=a+b;
printf ("\n%d",c);
a=b;
b=c;
}
getch ();
}
TABLE OF 5
WAP to print table of 5
void main ()
{
int a,tab;
clrscr ();
a=1,tab=0;
while (a<=10)
{
tab=5*a;
a++;
printf ("%d\n",tab);
}
getch ();
}
NUMBERS DIVIDED BY 7
WAP to print numbers from 1-50 which are divided by 7
void main ()
{
int a;
clrscr ();
a=1;
while (a<=50)
{
if (a%7==0)
printf ("%d\n",a);
a++;
}
getch ();
}
ADD ENTERED DIGITS
WAP to add entered three digits
void main ()
{
int no,r,res;
clrscr ();
printf ("Enter any value: ");
scanf ("%d",&no);
r=res=0;
while (no>0)
{
r=no%10;
no=no/10;
res=(res+r);
}
printf ("Sum is %d",res);
getch ();
}
REVERSE NUMBER
WAP to Reverse of any number using while loop
void main ()
{
int no,r,res;
clrscr ();
printf ("Enter any value: ");
scanf ("%d",&no);
r=res=0;
while (no>0)
{
r=no%10;
no=no/10;
res=(res*10)+r;
}
printf ("\nReverse is %d",res);
getch ();
}
ODD SERIES 20 TO 1
WAP to print Even & Odd numbers from 20 to 1
void main ()
{
int a;
clrscr ();
a=20;
while (a>=1)
{
if (a%2==0)
printf ("%d\t",a);
else
printf ("%d\n",a);
a--;
}
getch ();
}
SERIES 20 TO 1
WAP to print series from 20 to 1
#include
void main ()
{
int a;
clrscr ();
a=20;
while (a>=1)
{
printf ("\n%d",a);
a--;
}
getch ();
}
ODD SERIES
WAP to print Odd numbers from 1 to 20
void main ()
{
int a;
clrscr ();
a=1;
while (a<=20)
{
if (a%2==1)
printf ("\n%d",a);
a++;
}
getch ();
}
PALANDROM NUMBER
WAP to find that number is palandrom or not (121=121)
#include
void main ()
{
int no,r,res,temp=0;
clrscr ();
printf ("Enter Number: ");
scanf ("%d",&no);
r=res=0;
temp=no;
while (no>0)
{
r=no%10;
no=no/10;
res=(res*10)+r;
}
if (temp==res)
printf("Number is Palandrom");
else
printf("Number is not Palandrom");
getch ();
}
QUARDRATIC EQUATION
WAP to find out Quardratic Equation (d=b2-4ac)
void main ()
{
int a,b,c,d;
clrscr ();
printf ("Enter A: ");
scanf ("%d",&a);
printf ("Enter B: ");
scanf ("%d",&b);
printf ("Enter C: ");
scanf ("%d",&c);
d= (b*b)-(4*a*c);
printf ("\nAnswer is %d",d);
getch ();
}
LEAP YEAR
WAP to find out Year is leap or not (IF-ELSE)
void main ()
{
int a;
clrscr ();
printf ("Enter the Year: ");
scanf("%d",&a);
if (a%4==0)
{
printf ("\nYear is Leap");
}
else
{
printf("\nYear is not Leap");
}
getch ();
}
SWAP NUMBERS
WAP to SWAP the three digit number
void main ()
{
int b,r,n,r1,r2;
clrscr ();
printf ("Enter the Value: ");
scanf ("%d",&n);
r=n%10;
n=n/10;
r1=n%10;
n=n/10;
r2=n%10;
n=n/10;
b=(r*100)*(r2*10)+(r2);
printf ("%d%d%d",r,r1,r2);
getch ();
}
INCREMENTAL / DECREMENTAL
WAP to add 1 & subtract 1 from value of a & b
(Incremental & Decremental Operators)
void main ()
{
int a,b;
clrscr();
printf ("Enter A: ");
scanf ("%d",&a);
printf ("Enter B: ");
scanf ("%d",&b);
a++;
b--;
printf ("\nA is %d",a);
printf ("\nB is %d",b);
getch ();
}
POSITIVE / NEGATIVE
WAP to find out Positive or Negative (IF-ELSE)
void main ()
{
int a;
clrscr ();
printf ("Enter the value of A: ");
scanf("%d",&a);
if (a>=0)
{
printf ("Number is Positive");
}
else
{
printf("Number is Negative");
}
getch ();
}
EVEN OR ODD
WAP to find out Even or Odd number (IF-ELSE)
void main ()
{
int a;
clrscr ();
printf ("Enter the value of A: ");
scanf("%d",&a);
if (a%2==0)
{
printf ("\nNumber is Even");
}
else
{
printf("\nNumber is Odd");
}
getch ();
}
TOTAL SALARY
WAP to find out TOTAL SALARY with (IF-ELSE)
void main ()
{
long int sal,hra,ta,ts;
clrscr ();
printf ("Enter Salary: ");
scanf("%ld",&sal);
if (sal>=5000)
{
hra=sal*.10;
ta=sal*.07;
}
else
{
hra=sal*.08;
ta=sal*.05;
}
ts=sal+hra+ta;
printf ("\n\nTotal Salary is Rs.%ld", ts);
getch ();
}
TOTAL BILL/ DISCOUNT A
WAP to find out Total Bill with discount according to conditions (Ternary Operators)
void main ()
{
int b,dis,n;
clrscr ();
printf ("Enter Bill: ");
scanf ("%d",&b);
dis=(b<500)?(b*.10):(b>=500 && b<1000)?(b*.15):(b>=1000 && b<=2000)?(b*.20):(b*.25);
n=b-dis;
printf ("Net Bill is %d",n);
getch();
}
BIGGER & EQUAL
WAP to find out Bigger & Equal number from three numbers
(Ternary Operators)
void main ()
{
int a,b,c;
clrscr ();
printf ("Enter the value of A: ");
scanf("%d",&a);
printf ("Enter the value of B: ");
scanf ("%d",&b);
printf ("Enter the value of C: ");
scanf ("%d",&c);
(a>b && a>c)?printf("A is Big"):(b>a && b>c)?printf("B is Big"):(a==b && b==c)?printf("All are Eqaul"):printf("C is Big");
getch ();
}
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