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Important Programe

Add the two No in C

#include<stdio.h>
#include<conio.h>
void main ( )
{
int a ,b,c;
clrscr ( );
a=10;
b=20;
c=a+b;
printf("%d" ,c );
getch( );
 }

Write a program to find simple interest

#include<stdio.h>
#include<conio.h>
void main ( )
{
int p , r,t ,i;
clrscr ( );
p=1000;
r =4;
t =5;
i = (p* r* t)/100;
printf("simple interest =%d", i)
getch();
}


Write a program to input and print a character 

#include<stdio.h>
#include<conio.h>
void main ( )
{
char  ch ;
clrscr( );
printf ( "enter the character ");
scanf ("% c",& ch);
printf("Character is =%c ",ch);
getch( );
}

Write a program  to input cost & quantity and give 20%  discount on total bill


#include<stdio.h>
#include<conio.h>
void main ( )
{
int cost, q, t, d;
printf ( "enter the cost of item") ;
scanf(" %d ",&cost);
printf ( "enter the quantity of item") ;
scanf(" %d ",&q);
t =cost*q;
d=t * 20/100;
printf("\ n your total bill =%d", t);
printf("\ n your discount on  bill =%d", d);
printf("\ n your net  bill =%d", t-d);
getch ( );
}

Write a program to input length and breadth of a rectangle and calculate its area

#include<stdio.h>
#include<conio.h>
void main ( )
{
int area , len ,bre;
printf ("enter the length of rectangle ");
scanf ("%d ",&len);
printf ("enter the breadth of rectangle ");
scanf ("%d ",&bre);
area=len*bre;
printf("area of rectangle is %d", area);
getch ( );
}
Write a program to input age of five persons and find the average of age 

#include<stdio.h>
#include<conio.h>
void main ( )
{
int  a, b, c,d ,e, avg;
printf ("enter the five peson age ");
scanf("%d %d %d %d %d", &a,&b,&c,&d,&e );
avg=(a+b+c+d+e)/5 ;
printf( "average of five persons age is =%d ", avg);
getch ( );
}

Write a program to swap two numbers without using third variable 

#include<stdio.h>
#include<conio.h>
void main ( )
{
int a , b;
printf ("enter the value of a ") ;
scanf ("%d",&a);
printf ("enter the value of b");
scanf("%d",&b );
a=a+b;
b=a-b;
a=a-b;
printf("\n after swapping ");
printf("\n the value of a is =%d " ,a);
printf("\n the value of b is =%d " ,b);
getch ( );
}


Write a program to print reverse of a three digits no.

#include<stdio.h>
#include<conio.h>
void main ( )
{
int  n ,r ;
printf("enter the numbers");
scanf("%d", &n);
r = n%10;
printf("%d",&r);
n= n/10;
r= n%10 ;
printf("%d ",r );
n= n/10;
r= n%10 ;
printf("%d",r);
getch( );
}

Write a program to convert centigrade to fahrenheit

#include<stdio.h>
#include<conio.h>
void main ( )
{
float c , f;
printf ("enter the Centigrade");
scanf("%f", &c);
f=(9/5*c) + 32;
print("fahrenheit =% f", f);
}


Write a program to find the size of integer float and character

#include <stdio.h>
#include<conio.h>
void main ( )
{
int  a ;
float b ;
char c;

printf(“\n size of interger=% d bytes”,sizeof(a));
printf(“\n size of float=%d bytes”,sizeof(b);
printf(“\n size of character =%d bytes”,sizeof(c));
getch ( );
}

Write a  program  to input the age of  a person and find whether he or she is eligible for voting nor not




#include <stdio.h>
#include<conio.h>
void main ( )
{
int  a ;
printf(“enter the age of person “);
scanf (“%d”,& a);
if(a > 18)
{
printf(“you are eligible for voting ”);
}
else
{
printf(“you are not eligible for voting ”);
}

getch( );
}

Write a program to input a number and find whether  the number is positive or negative




#include <stdio.h>
#include<conio.h>
void main ( )
{
int  number ;
printf(“enter the any  number “);
scanf (“%d”,& number);
if( number > 0)
{
printf(“number  is positive  ”);
}
else
{
printf(“number is negative ”);
}

getch( );
}



Write a  example of if else if statement


#include <stdio.h>
#include<conio.h>
void main ( )
{
int  a , b;
printf(“enter the two value ”);
scanf(“%d %d”,&a , &b);

if (a>b)
{

printf(“a is big”);
}
else  if (b >a)
{

printf(“ b  is big”);
}
else
{

printf(“a is equal to b ”);
}


Write a Program  to Enter two number and check which one is bigger ( using  Ternary Operator)



#include <sdtio.h>
#include<conio.h>
void main ( )
{
int  a , b;
printf(“enter the two value ”);
scanf(“%d %d”,&a , &b);
(a>b) ? printf(“a is big ”) : printf( “b is big “);
getch( );
}



Write a program using  switch – case statement



#include <stdio.h>
#include<conio.h>
void main ( )
{
char  a ;
printf(“enter the  value of a”);
scanf(“%d”,&a );
switch (a)

{
case ‘r’ :
printf( “colour is red ”);
break ;
case ‘w’ :
printf( “colour is white ”);
break ;
case ‘g’ :
printf( “colour is green”);
break ;
case ‘b’ :
printf( “colour is blue ”);
break ;
default :
printf( “colour is not in this series ”);
getch ( );
}


Write a program  to enter the character and check  if it is  a vowel or not

#include <stdio.h>
#include<conio.h>
void main ( )
{
char  c ;
printf(“enter the  value of c”);
scanf(“%d”,&c);
switch (c)
{
case ‘a’ :
case ‘ i ’ :
case ‘ o ’ :
case ‘ u ’ :
case ‘ e ’ :
printf(“it is vowel ”);
break ;
default:
printf(“no is not vowel ”);
}
getch( );
}



Write a program  to print 1 to 10 digit (using for loop)

#include <stdio.h>
#include<conio.h>
void main ( )
{
Int a ;
for (a= 1; a<=10 ;a ++)
{
printf(“ \n this is the for loop program “);
}
getch ( );
}


Write a program to display the A to Z letter  using the for loop

#include <stdio.h>
#include<conio.h>
void main ( )
{
char  c ;
for (c=’A’; c<=’Z’; c++)
{
printf(“ %c ”, c);
}
getch ();
}


Write a program to print the format given below
   1
    12
    123
    1234

#include <stdio.h>
#include<conio.h>
void main ( )
{
int a,n=0 ;
clrscr();
for(a=1;a<=4;a++)
n=n*10+a;
printf(“\n %d”,n );
}
getch( );
}


Write a program  to count the even number between two given numbers


#include <stdio.h>
#include<conio.h>
void main ( )
{
int start , end, i,c=0;
printf(“enter the start no”);
scanf(“%d”,& start);
printf(“enter the ending no”);
scanf(“%d”,&end);
for (i=start;i<end;i++)
{
If (i%2==0)
{
c++;
}
}
printf(“total even no is =%d”,c);
getch();
}



Write a program to print series  2,4,8,16---------- using the while loop

#include <stdio.h>
#include<conio.h>
void main ( )
{
int  a=2;
while (a<=50)
{
printf(“%d’,&a);
a=a*2;
}
getch( );
}


Write a program  to find the factorial no for eg  5=(5*4*3*2*1)=120
#include <stdio.h>
#include<conio.h>
void main ( )
{
Int n ,i ,f=1;
clrscr( );
printf(“enter the any no ”);
scanf(“%d”,n);
i=n;
while (i>1)
{
f=f * i;
i--;
}
printf(“factorial no is =%d”,f);
getch();
}

Write a program to  convert a decimal number into binary number

#include <stdio.h>
#include<conio.h>
void main ( )
{
int n,c=10,r;
clrscr( );
printf(“enter the decimal number”);
scanf(“%d”,&n);
while (n>0)
{
r=n%2;
gotoxy(c,3); // gotoxy is the inbuilt () which take two parameters which is represent x ,y co ordinates
printf(“%d” ,r);
c--;
n=n/2;
}
getch( );
}

Write a program to print counting from 1 to 10 using while loop


#include <stdio.h>
#include<conio.h>
void main ( )
{
int  a;
clrscr();
a=1;
do{
printf(“%d” , a);
a++;
}
while(a<=10)
getch();
}
Write a program of infinte loop
#include <stdio.h>
#include<conio.h>
void main ( )
{
for ( ;  ; )
{
printf(“this is the program of infinite”);
}
getch();
}

Write a program to print following
1
12
123
1234
12345

#include <stdio.h>
#include<conio.h>
void main ( )
{
int i , j;
for (i=0;i<5;i++)
{
for (j=0;j<i;j++)
{
printf(“%d”,i);
}
printf(“\n”);
}
getch( );
}


Write a program of simple array

#include <stdio.h>
#include<conio.h>
void main ( )
{
int a[5],i ;
for (i=0;i<5;i++)
{
printf(“enter the number”);
scanf(“%d”,&a[i]);
}
for (i=0;i<5;i++)
{
printf(“\n %d”,a[i]);
}
getch( );
}

Write a program to sort an array

#include <stdio.h>
#include<conio.h>
void main ( )
{
int a[5],i ,j,t;
for (i=0;i<5;i++)
{
printf(“enter the number”);
scanf(“%d”,&a[i]);
}
for (i=0;i<5;i++)
{
for (j=j+1; j<5; j++)
{
If(a[i]>a[j])
{
t= a[i];
a[i]=a[j];
a[j]=t;
}}}
for (i=0;i<5;i++)
{
printf(“\t %d”,a[i])
}
getch( );
}


Write a program to input and print a string

#include <stdio.h>
#include<conio.h>
void main ( )
{
char ch[20];
clrscr();
printf(“enter the name”);
scanf(“%s”,&ch)
printf(“the name is =%s”,ch);
getch();
}

Write a program to reverse a string

#include <stdio.h>
#include<conio.h>
void main ( )
{
char  a[20],c;
int I,j;
printf(“enter the any string”);
scanf(“%s”,a );
for(i=0; a[i]!=’\0’; i++ )
{
c=c+1;
}
for(j=0;j>0; j--)
{
printf(“%c”,a[j]);
}
getch();
}


Write a program of gets and puts

#include <stdio.h>
#include<conio.h>
void main ( )
{
char  a[20];
printf(“enter the any string”);
 gets(a);
puts(a);
getch();
}


Write a program  to find a length  of string
#include <stdio.h>
#include<conio.h>
#include<string>
void main ( )
{
char  a[20];
int I;
printf(“enter the any string”);
scanf(“%s”,&a);
i=strlen(a);
printf(“the string length is =%d”,i);
getch();
}


Write a program of inbuilt sqrt()
#include <stdio.h>
#include<conio.h>
#include<math.h>
void main ( )
{
int i ;
printf(“enter the any value”);
scanf(“%d”,&i);
printf(“square  root of the number i=%d”,sqrt(i));
getch();
}

Write a programe to simple Functon


#include <stdio.h>
#include <conio.h>
void  sum ( );                           // function declaration
void main
{

Clrscr();
Sum () ;                                    // function  calling
getch ();

}
void  sum ( )                        // function definition

{

Int a , b, c;
printf( “ enter the two no “);
scanf(“%d  %d”,&a &b);

c=a+b;
printf (“sum is  %d “, c);
}


Write a program of pointer


#include <stdio.h>
#include <conio.h>
void  main( )
{
Int a ,*b;
a = 10;
b = &a;
printf ( “\n the value of a =%d”, a  );
printf (“\n the address of a =%u”, &a);
getch ( );
}     

Write a program using with structure.

#include<stdio.h>
#include<conio.h>
struct student
{
char name[20];
int roll, marks;
};
void main()
{
struct student s;
clrscr();
printf(“Enter student name”) ;
scanf(“%s”,&s.name);
printf(“Enter student roll no”);
scanf(“%d”,&s.roll);
printf(“Enter student marks”);
scanf(“%d”,&s.marks);
print(“\n your name=%s”,s.name);
printf(“\n your roll=%d”,s.roll);
printf(“\n your marks=%d”,s.marks);
getch();
}

Write a program of union


#include<stdio.h>
#include<conio.h>
union  student
{
char name[20];
int roll , marks;
};
void main()
{
union  student s;
clrscr();
s .name =' h';
printf ("\n your name =%c ",s.name );
 s.roll=1;
 printf ("\n your rollno =%d ",s.roll );
s.marks=100;
 printf ("\n your marks =%d ",s.marks);
}

Write a program of Enumeration


#include<stdio.h>
#include<conio.h>
enum color{red ,green , black ,white};
{

void main ( )
{
clrscr();
printf("\n the value of red =%d",red);
printf("\n the value of green =%d",green);

printf("\n the value of white =%d",white);
}

Write a program of FIEL handling 



#include <stdio.h>
#include <conio.h>
void  main ( )
{
char str[20];
FILE *fp;
clrscr ()
printf (“enter the any string “);
gets(str );
fp=fopen(“deep.txt”,” w”);
fputs (str , fp);
printf ( “data is written into the file :”);
fclose (fp);
getch();
}


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