C Programming Loop Problem with Solution

C PROGRAMMING के कुछ Loop PROBLEMS का SOLUTION. 👇

1.Program to print numbers from 1 to n using while loop.

#include<stdio.h>
#include<conio.h>
void main()
{
int i=1, n;
clrscr();
printf("Enter n : ");
scanf("%d", &n);
while(i<=n)
{
printf("%d\t",i);
i++;
}
getch();
}

2.Program to print numbers from n to 1 using Do While loop.

#include<stdio.h>
#include<conio.h>
void main()
{
int i=1, n;
clrscr();
printf("Enter n : ");
scanf("%d", &n);
i=n;
do
{
printf("%d\t",i);
i--;
}while(i>=1);
getch();
}

3. Program to print first n even numbers.

#include<stdio.h>
#include<conio.h>
void main()
{
int i=2, n;
//to print odd numbers set variable i=1
clrscr();
printf("Enter n : ");
scanf("%d", &n);
while(i<=n)
{
printf("%d\t",i);
i=i+2;
}
getch();
}

4. Program to accept a number and print that number in reverse order.

#include<stdio.h>
#include<conio.h>
void main()
{
int reminder, n;
clrscr();
printf("Enter n : ");
scanf("%d", &n);
while(n>0)
{
reminder=n%10;
printf("%d", reminder);
n=n/10;
}
getch();
}

5. Program to accept a number and print sum of it’s digits.

#include<stdio.h>
#include<conio.h>
void main()
{
int reminder, sum=0, n;
clrscr();
printf("Enter n : ");
scanf("%d", &n);
while(n>0)
{
reminder=n%10;
sum=sum+reminder;
n=n/10;
}
printf("Sum of digits : %d",sum);
getch();
}

6. Program to take a number from user and check whether it is Armstrong number or not.

#include<stdio.h>
#include<conio.h>
void main()
{
int i=2, temp, rem, sum=0, n;
clrscr();
printf("Enter n : ");
scanf("%d", &n);
temp = n;

while(n>0)
{
rem = n%10;
sum = sum+(rem*rem*rem);
n = n/10;
}

if(temp==sum)
printf("Entered number is an Armstrong Number");
else
printf("Entered number is not an Armstrong Number");
getch();
}

7. Program to take number from user and print table of that number.

#include<stdio.h>
#include<conio.h>
void main()
{
int i, n;
clrscr();
printf("Enter number : ");
scanf("%d", &n);
for(i=1; i<=10; i++)
printf("%d × %d = %d\n", n, i, n*i);
getch();
}

8. Program to accept number and print it's factorial.

#include<stdio.h>
#include<conio.h>
void main()
{
int i, fact=1, n;
clrscr();
printf("Enter number : ");
scanf("%d", &n);

for(i=1; i<=n; i++)
{
fact = fact*i;
}
printf("Factorial is: %d", fact);
getch();
}

9. Program to accept number and print if it is prime number or not.

#include<stdio.h>
#include<conio.h>
void main()
{
int i, n;
clrscr();
printf("Enter number : ");
scanf("%d", &n);

for(i=2; i<=n/2; i++)
{
if(n%i==0)
{
printf("Number is not Prime");
getch();
break;
}
}
printf("Number is Prime");
getch();
}

10. Program to print 'n' prime numbers.

#include<stdio.h>
#include<conio.h>
#include<process.h>
void main()
{
int i, j, flag=1, n;
clrscr();
printf("Enter number : ");
scanf("%d", &n);

for(i=2; i<=n; i++)
{
flag=1;
for(j=2; j<=i/2; j++)
{
if(i%j==0)
{
flag=0;
break;
}
}
if(flag==1)
printf("%d\n", i);
}
getch();
}

11. Program to accept a number and print Fibonacci sequence.

#include<stdio.h>
#include<conio.h>
void main()
{
int pre=1, cur=1, temp, i, n;
//pre means previous number
//cur means current number
clrscr();
printf("Enter number : ");
scanf("%d", &n);
printf("%d\t%d", pre, cur);

for(i=3; i<=n; i++)
{
temp = cur;
cur = pre + cur;
pre = temp;
printf("\t%d", cur);
}
getch();
}

12. Add 'n' numbers.

#include<stdio.h>
#include<conio.h>
void main()
{
int n, sum=0, i, value;
clrscr();

printf("Enter total numbers you want to add : ");
scanf("%d", &n);

for (i=1; i<=n; i++)
{
printf("Enter number %d : ", i);
scanf("%d", &value);
sum = sum + value;
}

printf("Sum of entered numbers : %d", sum);
getch();
}

13. Program to accept a number and add the digits of that number.

#include<stdio.h>
#include<conio.h>
void main()
{
int n, sum = 0, remainder;
clrscr();

printf("Enter the number : ");
scanf("%d", &n);

while (n != 0)
{
remainder = n % 10;
sum = sum + remainder;
n = n / 10;
}

printf("Sum of digits of entered number : %d", sum);
getch();
}

14. Program to Print Average of N numbers.

#include<stdio.h>
#include<conio.h>
void main()
{
int n, i;
float sum=0, x, avg;
clrscr();
printf("Enter total Numbers : ");
scanf("%d", &n);
for (i = 1; i <= n; i++)
{
printf("\nNumber %d : ", i );
scanf("%f", &x);
sum += x;
}
avg = sum / n;
printf("\nThe Average is : %0.2f", avg);
getch();
}

15. Program to calculate Square of 'n' numbers.

#include<stdio.h>
#include<conio.h>
void main()
{
int n, r, i, sqr=0;
clrscr();
printf("\nEnter the range : ");
scanf("%d", &r);

for (i = 1; i <= r; i++)
{
n = i;
sqr = n * n;
printf("\nSquare of %d is : %d .", n, sqr);
}
getch();
}

16. Program to find power of number.

#include<stdio.h>
#include<conio.h>
void main()
{
int base, expo;
int value = 1;
clrscr();
printf("Enter base number : ");
scanf("%d", &base);
printf("Enter exponent number : ");
scanf("%d", &expo);

while (expo != 0)
{
// value = value * base;
value *= base;
--expo;
}
printf("Answer : %d", value);
getch();
}

17. Program to calculate HCF & LCM.

#include<stdio.h>
#include<conio.h>
void main()
{
int a, b, x, y, t, hcf, lcm;
clrscr();
printf("Enter two numbers : ");
scanf("%d%d", &x, &y);

a = x;
b = y;

while (b != 0)
{
t = b;
b = a % b;
a = t;
}

hcf = a;
lcm = (x * y) / hcf;

printf("\nHighest Common Factor of %d and %d : %d", x, y, hcf);
printf("\nLeast Common Multiple of %d and %d : %d", x, y, lcm);
getch();
}

18. Program to find largest number of 'n' numbers.

#include<stdio.h>
#include<conio.h>
void main()
{
int n, num, i;
int big;
clrscr();
printf("Enter total numbers : ");
scanf("%d", &n);

printf("Number %d : ", 1);
scanf("%d", &big);

for (i = 2; i <= n; i++)
{
printf("Number %d : ", i);
scanf("%d", &num);

if (big < num)
big = num;
}

printf("Largest number is : %d", big);
getch();
}

19. Program to check Niven number (Harshad number).

#include<stdio.h>
#include<conio.h>
void main()
{
int n, d, a, sum = 0;
clrscr();
printf("Enter the number : ");
scanf("%d", &n);

a = n;

while (a > 0)
{
d = a % 10;
sum = sum + d;
a = a / 10;
}

if (n % sum == 0)
printf("\nThe number is Niven Number.");
else
printf("\nThe number is not a Niven Number.");
getch();
}

20. Program to check whether the number is palindrome or not.

#include<stdio.h>
#include<conio.h>
void main()
{
int n, rev = 0, temp;
clrscr();
printf("Enter a number : ");
scanf("%d", &n);

temp = n;

while (temp != 0)
{
rev = rev * 10;
rev = rev + temp % 10;
temp = temp / 10;
}

if (n == rev)
printf("\n%d is palindrome number.", n);
else
printf("\n%d is not palindrome number.", n);
getch();
}

21. Program to check perfect number.

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

void main()
{
int n, i = 1, sum = 0;
clrscr();
printf("Enter a number : ");
scanf("%d", &n);

/*The first perfect number is 6, because 1, 2, and 3 are its proper positive divisors, and 1 + 2 + 3 = 6.*/

while (i < n)
{
if (n % i == 0)
{
sum = sum + i;
}
i++;
}

if (sum == n)
{
printf("\n%d is a perfect number.", i);
}
else
{
printf("\n%d is not a perfect number.", i);
}
getch();
}

22. Program to calculate the sum of 'n' terms in Taylor series.

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

void main()
{
int x, i;
int fact = 1, n;
float sum = 0;
clrscr();
printf("Enter the value of x : ");
scanf("%d", &x);
printf("Enter the number of terms : ");
scanf("%d", &n);

for (i = 1; i < n; i++)
{
fact = fact * i;
sum = sum + (pow(x, i) / fact);
}
sum = sum + 1;
printf("The sum of taylor series is : ");
printf("%f", sum);
getch();
}

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C Programming Loop Problem with Solution