All Problem in C programming

1.    Compute area of a rectangle. Make two integers- length and width. Take the values of them from the user. Show the area of the rectangle.

2.    Compute the volume of a cylinder. Ask the user to input the radius (r). Assign the value 3.14 to a variable called pie. (hint: volume of a cylinder=4/3*pie*r*r*r). Take all the variables as float.

3.    Modify the above program. a and b will be input by the user. Declare four more variables and take a-b, a*b, a/b and a%b into them. Show all of the four variables as well.

4.    Compute Jovian years. Jupiter rounds the sun in 10 hours. It will be interesting to know if the Earth passes X years, how many years Jupiter will pass. Ask the user to put the years the Earth passes. Make appropriate calculations with arithmetic operators and show how many years Jupiter passes by that time.

5.    Write a program that shows the volume of a cube. Ask the user to input three dimensions of the cube- length, width and height.

6.    Swapping values of variables. Check the following program. It takes two integers- a and b. Then, with the help of another integer variable c (we call it temporary variable), we swapped the values (value of a goes to b and vice versa).

#include<stdio.h>
#include<conio.h>
void main()
{
int a,b,c;
printf("Enter a , b: ");
scanf("%d%d",&a,&b);
printf("Before Swapping a: %d b: %d ",a,b);
c=b; // taking b to c, b is empty now

b=a; // taking a to b, b contains a

a=c; // taking c to b, a contains previous value of b
printf("After Swapping a: %d b: %d",a,b);
getch();
}

Swap the values of two numbers without using temporary variable.

7.    Write a program that takes an integer from the user and can tell if the integer is odd or even. (hint: if you divide an integer with 2 and there is reminder- that integer is odd, else it is even).

8.    The Grade conversion. Ask the user to input his marks. Then convert the marks into letter grades and provide it to the user. The grade conversion chart is given here-

Marks	Grade	Marks	Grade
160 or more	A+	150-159	A
140-149	A-	130-139	B+
120-129	B	110-119	B-
100-109	C+	90-99	C
80-89	D	Less than 80	F

9.    A company insures its drivers in the following cases-

1. If the driver is married

2. If the driver is unmarried, male & above 30 years of age

3. If the driver is unmarried, female & above 25 years of age

In all other cases, the drivers are not insured. Write a program that takes input marital status, sex and age of the driver. Determine whether the driver is insured or not.

10. Enter a character from the keyboard. Write a program to determine whether the character is a capital letter, a small case letter, a digit or a special symbol. [Hint: you can directly compare a character with an integer value]. Use the following table for the comparison.

Characters	ASCII Values
A-Z	65-90
a-z	97-122
0-9	48-57
Special symbols	0-47, 58-64, 91-96, 123-127

11. Write a program that prints the following (Hint: Use nested while repetition)-

   1   2   3   4   5   6   7   8   9  10  11  12

   2   4   6   8  10  12  14  16  18  20  22  24

   3   6   9  12  15  18  21  24  27  30  33  36

   4   8  12  16  20  24  28  32  36  40  44  48

   5  10  15  20  25  30  35  40  45  50  55  60

   6  12  18  24  30  36  42  48  54  60  66  72

   7  14  21  28  35  42  49  56  63  70  77  84

   8  16  24  32  40  48  56  64  72  80  88  96

   9  18  27  36  45  54  63  72  81  90  99 108

  10  20  30  40  50  60  70  80  90 100 110 120

  11  22  33  44  55  66  77  88  99 110 121 132

  12  24  36  48  60  72  84  96 108 120 132 144

12. Take a number from the user. Calculate its factorial. (useful hint: take the type of the variable long).

n.b. A factorial of a number 5 is as follows-

5X4X3X2X1=120

13. Write a program to print all prime numbers from 1 to 300.

14. According to a study, the approximate level of intelligence of a person can be calculated using the following formula: i = 2 + ( y + 0.5 x ). Write a program, which will produce a table of values of i, y and x, where y varies from 1 to 6, and, for each value of y, x varies from 5.5 to 12.5 in steps of 0.5.

15. Write a menu driven program which has following options:

      1. Factorial of a number.

        2. Prime or not

        3. Odd or even

(hint: Use switch statement for taking the choice and inside of 3 cases, just put the code you did for factorial of a number, determining prime number and program you wrote to find out odd or even)

16. Ask the user to put an integer. Using a do-while loop, find its triangular number. For example, the triangular number of 7 is 7+6+5+4+3+2+1=28.

Write a program to determine whether a number is prime or not using for loop.

17. Write a menu driven program with switch statement. In this case, user will give two integers and a choice.

Choice=1: add the integers and show the answer

Choice=2: subtract the integers and show the answer

Choice=3: multiply the integers and show the answer

Choice=4: divide the integers and show the answer

Default: show error message

18. Write a function power ( a, b), to calculate the value of a raised to b. (hint: do not use the pow() built in function of C).

19. Write a function gcd (a,b) that returns the Greatest Common Divisor of a and b.

(hint: gcd of 12 and 18 is=  6;

                                    18/12, division 1, remainder 6

                                    12/6, division 2, remainder 0

                                    therefore, the gcd is 6)

you should have a SWAPPING mechanism in your program, i.e., 18/12 is possible but not 12/18. In that case your program will swap the values

20. Write a program using appropriate user defined functions that returns the Least Common Multiple of a and b.

21. A positive integer is entered through key-board. Write a function to obtain the prime factors of this number.

(hint: prime factors of 24 are 2,2,2 and 3. prime factors of 35 are 5 and 7).

22. Write a program that will ask 10 values from the user. And for those 10 values, draw the histogram.

23. In wars, there are certain codes. These codes are exchanged between two soldiers of the same army. The opponent army mostly tries to capture the code to get valuable information. Therefore, two soldiers while exchanging their information introduce cryptography. For example, Iamdoingfine can be encrypted as Jbnepjohgjof. How? Simply turning a letter to its following letter: iàj, aàb, màn and so on.

24. Write a program that will take such string from the user and will convert that string into such encrypted message.

25. Initialize a multidimensional array (10X3) so that the first element of each row contains a number, the second element contains its square and the third element gets its cube. Stop at 10.

1 1 1

2 4 8

3 9 27

……….

……….

10 100 1000

Now, ask the user to put the cube. Look up this value in the multidimensional array and print its cube’s root and root’s square.

26. Make two arrays of dimension 3X3. Think of these two arrays as two matrices. Multiply the matrices using the matrix multiplication procedure. Show the result in matrix format.

27. Create an integer array of 20 elements. Ask the user to put 20 numbers (similar numbers can be given). Determine their frequency. For example, if the user puts 10,11,1,1,2,10,10,11,2,2- then the frequency will be-

10: 3 times

11: 2 times

1: 2 times

2: 3 times

28. Write a program that will take an array of values and sort them according to bubble sort procedure.