The document contains 10 programming problems related to basic C concepts like data types, operators, functions, arrays, pointers etc. Each problem has the code to solve it along with sample input/output. The problems cover topics like number formatting, arithmetic operations using switch case, finding min/max, addition of numbers, matrix operations, string functions and recursion.

1. Practical no.1
Write a C program to display hexadecimal decimal octal format of the
entered numbers.
#include<stdio.h>
#include<conio.h>
void main()
{
intnum;
clrscr();
printf("Enter the number : ");
scanf("%d",&num);
printf("nDecimal format : %d",num);
printf("nHexaDecimal format : %x",num);
printf("nOctal format : %o",num);
getch();
}
OUTPUT:
Enter the number:12
Decimal format :12
Hexadecimal format:c
Octal format:14

2. Practical no.2
To demonstrate all possible formatting specifiers.
Format Specifiers for C
%c The character format specifier.
%d The integer format specifier.
%i The integer format specifier (same as %d).
%f The floating-point format specifier.
%e The scientific notation format specifier.
%E The scientific notation format specifier.
%g Uses %f or %e, whichever result is shorter.
%G Uses %f or %E, whichever result is shorter.
%o The unsigned octal format specifier.
%s The string format specifier.
%u The unsigned integer format specifier.
%x The unsigned hexadecimal format specifier.
%X The unsigned hexadecimal format specifier.
%p Displays the corresponding argument that is a pointer.
%n Records the number of characters written so far.
%% Outputs a percent sign.
printf statements is called an escape sequence:
n (newline)
t (tab)
v (vertical tab)
f (new page)
b (backspace)
r (carriage return)
n (newline)

3. Practical no.3
Write a program to find the largest and the smallest from the given
three integers.
#include<stdio.h>
#include<conio.h>
void main()
{
int num1, num2, num3;
clrscr();
printf("Enter three numbers = ");
scanf("%d %d %d", &num1, &num2, &num3);
printf("nnThe largest number is ");
if( (num1 > num2) && (num1 > num3) )
printf("%d", num1);
else if(num2 > num3)
printf("%d", num2);
else
printf("%d", num3);
printf("nnThe Smallest number is ");
if( (num1 < num2) && (num1 < num3) )
printf("%d", num1);
else if(num2 < num3)

4. printf("%d", num2);
else
printf("%d",num3);
getch();
}
OUTPUT:
Enter three numbers: 12
15
67
The largest no. is :67
The smallest no.is :12

5. Practical no.4
Write a C program to find even or odd numbers.
#include<stdio.h>
main()
{
intnum;
printf ("Enter a number to be checked for even/odd: ");
scanf ("%d",&num);
if (num%2==0)
{
printf ("The entered number is EVEN.n");
}
else
{
printf ("The entered number is ODD.n");
}
}
OUTPUT:
Enter a number to be checked for even/odd:15
The entered number is ODD.

6. Practical no.5
Write a C program to display menu 1.Addition 2.Subtraction
3.Multiplication 4.Division and execute it using switch case.
#include<stdio.h>
#include<conio.h>
void main()
{
inta,b,c;
int menu;
printf("choose the arithmetic optionn");
scanf("%d",&menu);
switch(menu)
{
case 1:
printf("Enter The Two Numbers:n");
scanf("%d%d",&a,&b);
c=a+b;
printf("The addition of two numbers %dn",c);
break;
case 2:
printf("Enter THE TWO NUMBERS:n");
scanf("%d%d",&a,&b);
c=a-b;
printf("The subtraction of two numbers %dn",c);
break;
case 3:
printf("Enter THE TWO NUMBERS:n");
scanf("%d%d",&a,&b);
c=a*b;
printf("The multiplication of two numbers %dn",c);
break;
case 4:
printf("Enter THE TWO NUMBERS:n");
scanf("%d%d",&a,&b);
c=a/b;
printf("The division of two numbers %dn",c);
break;
}

7. getch();
}
OUTPUT:
choose the arithmetic option
2
Enter THE TWO NUMBERS:
15 6
The subtraction of two numbers :9

8. Practical no.6
Write a c program to perform addition all numbers from 1 to 100.
#include<stdio.h>
#include<conio.h>
void main()
{
int i=0,sum=0;
clrscr();
while(i<100)
{
sum=sum+i;
i++;
}
printf("Addition of all numbers from 1-100=%d",sum);
getch();
}
OUTPUT:
Addition of all numbers from 1-100=4950

9. Practical no.7
Write a C program to find smallest and largest number from array
elements.
#include<stdio.h>
#include<conio.h>
Void main()
{
int a[20],min,max;
intn,i;
clrscr();
printf("enter the num of elementst:");
scanf("%d",&n);
printf("enter the elementsn");
for( i=0;i<n;i++)
{
scanf("%d",&a[i]);
if(i==0)
{
min=max=a[i];
}
if(a[i]<min)
min=a[i];
else if(a[i]>max)

10. max=a[i];
}
printf("largest element is %d n Smallest element is %d ",max,min);
getch();
}
OUTPUT:
enter the num of elements:5
enter the element:12
56
23
10
78
largest element is 78
Smallest element is 10

11. Practical no.8
Write a C program to enter elements for 3*3matrix and display them.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[3][3],i,j;
clrscr();
printf("ENTER ELEMENTSn");
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
scanf("%d",&a[i][j]);
}
}
printf("THE ELEMENTS IN 3*3 MATRIX FORM ISn");
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
printf("%d",a[i][j]);
}
printf("n");
}
getch();
}
OUTPUT:
ENTER ELEMENTS
1
2
3
4
5
6
7
8
9
THE ELEMENTS IN 3*3 MATRIX FORM IS
1 2 3
4 5 6
7 8 9

12. Practical no.9
Write a C program to demonstrate output of standard library
functions. Strlent( ),strcpy( ),strcat( ),strcmp( ).
#include<stdio.h>
#include<conio.h>
#include<string.h>
void main()
{
char s1[10],s2[10],s3[30];
int a;
clrscr();
printf("enter the two stringsn");
scanf("%s%s",&s1,&s2);
printf("1st String=%sn2ndString=%s",s1,s2);
if(strcmpi(s1,s2) == 0 )
printf("Entered strings are equal.n");
else
printf("Entered strings are not equal.n");
a=strlen(s1);
printf("nLength=%d",a);
strcat(s1,s2);
printf("nconcatinated string=%s",s1);
strcpy(s1,s2);
printf("ncopied string=%s",s1);
getch();
}

13. OUTPUT:
enter the two strings
Good
Morning
1st String=Good
2ndString=Morning
Entered strings are not equal.
Length=4
concatinated string=GoodMorning
copied string=Morning

14. Practical no.10
Write a C program to calculatefactorial of any number using
recursion.
#include<stdio.h>
#include<conio.h>
int fact(int );
int main()
{
intnum,res;
printf("Enter any number: ");
scanf("%d", &num);
res = fact(num);
printf("Factorial value is: %d",res);
getch();
return 0;
}
int fact(int n)
{
int f;
if(n==1)
return(1);
else
f = n*fact(n-1);
return(f);
}
OUTPUT:
Enter any number:5
Factorial value is:120

15. Practical no.11
Write a C program to demonstrate call by value and call by reference.
//CALL BY VALUE
#include<stdio.h>
#include<conio.h>
int swap(int,int);
void main()
{
inta,b;
printf("nenter two values:");
scanf("%d%d",&a,&b);
printf("Before swapping:n");
printf("A=%dn B=%d",a,b);
swap(a,b);
getch();
}
int swap(intx,int y)
{
int temp;
temp=x;
x=y;
y=temp;

16. printf("After swapping:n A=%dnB=%d",x,y);
return(0);
}
OUPUT:
enter two values
30
20
Before swapping:
A=30
B=20
After swapping:
A=20
B=30

17. //CALL BY REFERENCE
#include<stdio.h>
#include<conio.h>
int swap(int *,int *);
void main()
{
inta,b;
printf("nenter two values:");
scanf("%d%d",&a,&b);
printf("Before swapping:n");
printf("A=%dn B=%d",a,b);
swap(&a,&b);
getch();
}
int swap(int *x,int *y)
{
int temp;
temp=*x;
*x=*y;
*y=temp;
printf("After swapping:n A=%dnB=%d",*x,*y);
return(0);
}

18. OUPUT:
enter two values
30
20
Before swapping:
A=30
B=20
After swapping:
A=20
B=30