C Practical Session 5

21. Write a Program to print the sum of as many numbers as user want.
Answer :

#include<stdio.h>
#include<conio.h>

Void main()
{
int num, sum=0;
char reply='y';
while(reply == 'y')
{
printf("\n Enter The Number to Add:");
scanf("%d",&num);
sum= sum+num;
printf("\n Continue(y/n):");
scanf("%c", & reply);
}
printf("\n The sum of all the numbers is =%d", sum);
getch();
}

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22. Accept a Number tell user want and check that is prime number or not.
Answer :

#include<stdio.h>
#include<conio.h>

Void main()
{
int num, i=2, flag=0;
char ch;
clrscr();
do
{
printf("Enter The Number, Which you want to check:");
scanf("%d", &num);
while(i<=num-1)
{
if(num%i ==0)
{
printf("Number is Not Prime");
flag =1;
break;
}
i++;
}
if(flag == 0)
printf("Number is Prime");
printf("\n You want to check more number, Enter Y");

fflush(stdin);
scanf("%c", & ch);
flag = 0;
}
while((ch == 'y')|| (ch == 'y'))
getch();
}

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23. Write a Program to check the given number is prime or not.

Answer :

#include<stdio.h>

#include<conio.h>

Void main()

{

int num, i;

printf("\n Enter Any Number:");

scanf("%d",& num);

for(i=2; i<=num/2; ++i)

{

if(num%i == 0)

{

printf("\n Not a Prime Number");

exit(0);

}

}

printf("\n It is a Prime Number:");

getch();

}

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24. Write a Program to check the given number is prime or not. Prime Numbers are the numbers

that are divisible by 1 and itself only.

Answer :

#include<stdio.h>

#include<conio.h>

Void main()

{

int num, f=1,i;

printf("\n Enter any Number:");

scanf("%d",&num);

for(i=2; i<num; ++i)

{

if((num%i)==0)

{

f=0;

break;

}

}

if(f==0)

printf("\n %d is not a Prime Number", num);

else

printf("\n %d is a Prime Number", num);

getch();

}

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25. Write a Program that accept a number from user and find its factorial with if-else.

Answer :

#include<stdio.h>

#include<conio.h>

Void main()

{

int n,m=1, f=1;

printf("Enter Value:");

scanf("%d", &n);

f=f*m;

if(m == n)

{

printf(%d",f);

}

else

{

m = m+1;

}

getch();

}

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