C QUESTIONS AND ANSWER

1. PERFECT NUMBER.

void main()

{

int n,i=1,sum=0;

clrscr();

printf("\nEnter a number:-");

scanf("%d",&n);

while(in2)

n1=n1-n2;

else

n2=n2-n1;

}

printf("\nGCD=%d",n1);

getch();

}

9. L.C.M OF TWO NUMBERS.

void main()

{

int n1,n2,x,y;

clrscr();

printf("\nEnter two numbers:");

scanf("%d %d",&n1,&n2);

x=n1,y=n2;

while(n1!=n2)

{

if(n1>n2)

n1=n1-n2;

else

n2=n2-n1;

}

printf("L.C.M=%d",x*y/n1);

getch();

}

10. SWAP TWO VARIABLES WITHOUT USING THIRD VARIABLE

void main()

{

int a,b;

clrscr();

printf("\nEnter two numbers:");

scanf("%d %d",&a,&b);

printf("\nBefore swapping a=%d b=%d",a,b);

a=a^b;

b=b^a;

a=a^b;

printf("\nAfter swapping a=%d b=%d",a,b);

getch();

}

11. FLOYD’S TRIANGLE

1

2 3

4 5 6

void main()

{

int i,j,r,k=1;

clrscr();

printf("\nEnter the range:");

scanf("%d",&r);

printf("\nFLOYD'S TRIANGLE\n\n");

for(i=1;i<=r;i++)

{

for(j=1;j<=i;j++,k++)

printf(" %d",k);

printf("\n");

}

getch();

}

12. PRIME FACTORS OF A NUMBER

void main()

{

int num,i=1,j,k;

clrscr();

printf("\nEnter a number:");

scanf("%d",&num);

while(i<=num)

{

k=0;

if(num%i==0)

{

j=1;

while(j<=i)

{

if(i%j==0)

k++;

j++;

}

if(k==2)

printf("\n%d is a prime factor",i);

}

i++;

}

getch();

}

13. MULTIPLICATION TABLE

void main()

{

int r,i,j,k;

clrscr();

printf("\nEnter the number range:-");

scanf("%d",&r);

for(i=1;i<=r;i++)

{

for(j=1;j<=10;j++)

printf(" %d*%d=%d",i,j,i*j);

printf("\n");

}

getch();

}

14. FACTORIAL OF A NUMBER

void main()

{

int i=1,f=1,num;

clrscr();

printf("\nEnter a number:");

scanf("%d",&num);

while(i<=num)

{

f=f*i;

i++;

}

printf("\nFactorial of %d is:%d",num,f);

getch();

}

15. FIBONACCI SERIES

void main()

{

int i=0,j=1,k=2,r,f;

clrscr();

printf("Enter the number range:");

scanf("%d",&r);

printf("\nFIBONACCI SERIES: ");

printf("%d %d",i,j);

while(k
{

f=i+j;

i=j;

j=f;

printf(" %d",j);

k++;

}

getch();

}