Problem Solving in Java - 20 problems clear your basic. | Java Programming

This Article for them who have basic knowledge of java but begainer in problem solving. it covered concepts of if-else statement , Array and String manipulation.

At first try your self. you can get help of video tutorial if you failed several time. Solution link given at the bottom of this article.

1. Print the following shapes using loop(s)

2. Write a program to generate the following output (in the given layout) using

loop(s).

3. Write a program that takes the height and width of a square and print the box of

that height and width with alphabet ‘B’. E.g. if user presses 5 for height and 8 for

width, your program should print the following. (Restrict the user such that

height or width should not be equal to zero).

4. Develop a program that inputs 10 different integers within a while loop and

displays the largest as well as smallest. (Repetition of numbers is not allowed).

5. Write a program that asks the base and exponent (power) from user and print

the result using do while loop. e.g. If base is 2 and exponent is 3, so 2*2*2 is 8.

6. Using for loop, print the result of multiplication of all odd numbers from 1 to 20

and the result of sum of all even numbers from 1 to 100.

7. Print the following shapes using loop(s)

8. Take an integer input from the user, print YES if it is prime number and NO if it

not a prime number. (Prime number is a number which is only divisible by 1 or

itself).

9. using do while print the number of digits this number contains.

10. Take two numbers from the user and print the result of multiplication and

sum of all the numbers between these two numbers. E.g. if user presses 3 and 8

then 4+5+6+7 is 22 and 4*5*6*7 is 840. (Restrict the user such that first

number must be less than the second number).

11. Take an integer input from the user and count all prime numbers from 1 up

to that number, print the total number of prime numbers as well as the largest

one. E.g. if user presses 20, your program should print “Total number of prime

numbers are: 8” (as prime numbers from 1 to 20 are 1, 3, 5, 7, 11, 13, 17, 19)

and “Largest prime number is: 19”.

12. Write a program which asks the user “How many prime numbers you want to

print: “, you have to print that much prime numbers as well as the sum of all

printed prime numbers. If user presses 11, your program should print first eleven

prime numbers, these are 1 3 5 7 11 13 17 19 23 29 31 and sum of these

printed numbers, that is 159. (Restrict the user such that input should not be

negative).

13. Take two integer arrays of 10 indices each and initialize them. Then copy

the contents of both of the arrays in a third array, one consecutive index from

one array at a time.

E.g. if the array1 has 1 2 3 4 5 6 7 8 9 10 stored and array2 has 11 12 13 14 15 16 17 18 19 20 stored then array three will have 1 11 2 12 3 13 4 14 5 15 6 16 7 17 8 18 9 19 10 20 stored.

14. Initialize integer array with 10 random values. Then print the second

smallest as well as second largest element from that array. (E.g. 23 7 2 56 3 8 9.

here second largest is 23 and second smallest is 3). you code might not work for 1 2 2 2 2 5 5 8 8 8 8 8, second largest is 5 and second smallest is 2. You have to

check ur program with many test cases.

15. Declare an array and take input from the user in that array, ask the user to

enter an integer and you have to print index number of that integer. if that

number exists 2 or more time at different indexes then u have to print all indexes

having that integer input.

16. Declare array and take input from the user to fill that array, take two

integer input from the user, you have to find indexes of those numbers and than

exchange those number. if 45 comes at index 3 and 67 comes at index 9. After

exchange, index 3 should contain 67 and index 9 should contain 45.

17. Declare and take input from the user in two arrays a and b, you have to print

all the numbers which exist in both the arrays.

18. Declare and take input from the user in character array, and you have to

print total number of vowels in that array (e.g. d t i o o a r w h s h w q n x b , total number of vowels are 4 (as i o o a ) ).

19. Take two arrays of character type and take input from the user, you have to

exchange the elements of both arrays. array A should contains elements of B, and

B should contain the elements of A.

Credit and Solution Link: https://youtu.be/Sny9Rta3k_Q

Basic Problem Solving using C Programming Language | Programming Basic

Problem Solving:

Note: At first try yourself by "Hide Solution" and if you failed then "Show Solutions". Happy Coding :)

Problem 1:  Write your first program which will print "Hello World"

Solution:

Problem 2:  Write a program which will take input two numbers from user and print.

Solution:

Problem 3:  Write a program which will take input a character from user and print.

Solution:

Problem 4:  Write your first program which will print "Hello World"

Solution:

Problem 5:  Write your first program which will print "Hello World"

Solution:

Problem 6:  Write your first program which will print "Hello World"

Solution:

Problem 7:  Write your first program which will print "Hello World"

Solution:

Problem 8:  Write your first program which will print "Hello World"

Solution:

Problem 9:  Write your first program which will print "Hello World"

Solution:

Problem 10:  Write your first program which will print "Hello World"

Solution:

Problem 11:  Write your first program which will print "Hello World"

Solution:

Problem 12:  Write your first program which will print "Hello World"

Solution:

Problem 13:  Write your first program which will print "Hello World"

Solution:

Problem 14:  Write your first program which will print "Hello World"

Solution:

Problem 15:  Write your first program which will print "Hello World"

Solution:

Problem 16:  Write your first program which will print "Hello World"

Solution:

Problem 17:  Write your first program which will print "Hello World"

Solution:

Problem 18:  Write your first program which will print "Hello World"

Solution:

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Learn About Primary Data Types - C Programming | Programming Basic

Data Types - C Programming

Data types in c refer to an extensive system used for declaring variables or functions of different types. The type of a variable determines how much space it occupies in storage and how the bit pattern stored is interpreted.

Integer Types

The following table provides the details of standard integer types with their storage sizes and value ranges −

Type	Storage size	Value range
char	1 byte	-128 to 127 or 0 to 255
unsigned char	1 byte	0 to 255
signed char	1 byte	-128 to 127
int	2 or 4 bytes	-32,768 to 32,767 or -2,147,483,648 to 2,147,483,647
unsigned int	2 or 4 bytes	0 to 65,535 or 0 to 4,294,967,295
short	2 bytes	-32,768 to 32,767
unsigned short	2 bytes	0 to 65,535
long	8 bytes	-9223372036854775808 to 9223372036854775807
unsigned long	8 bytes	0 to 18446744073709551615

Given below is an example to get the size of various type on a machine using different constant defined in limits.h header file −

Live Demo

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <float.h>

int main(int argc, char** argv) {

    printf("CHAR_BIT    :   %d\n", CHAR_BIT);
    printf("CHAR_MAX    :   %d\n", CHAR_MAX);
    printf("CHAR_MIN    :   %d\n", CHAR_MIN);
    printf("INT_MAX     :   %d\n", INT_MAX);
    printf("INT_MIN     :   %d\n", INT_MIN);
    printf("LONG_MAX    :   %ld\n", (long) LONG_MAX);
    printf("LONG_MIN    :   %ld\n", (long) LONG_MIN);
    printf("SCHAR_MAX   :   %d\n", SCHAR_MAX);
    printf("SCHAR_MIN   :   %d\n", SCHAR_MIN);
    printf("SHRT_MAX    :   %d\n", SHRT_MAX);
    printf("SHRT_MIN    :   %d\n", SHRT_MIN);
    printf("UCHAR_MAX   :   %d\n", UCHAR_MAX);
    printf("UINT_MAX    :   %u\n", (unsigned int) UINT_MAX);
    printf("ULONG_MAX   :   %lu\n", (unsigned long) ULONG_MAX);
    printf("USHRT_MAX   :   %d\n", (unsigned short) USHRT_MAX);

    return 0;
}

Floating-Point Types

The following table provide the details of standard floating-point types with storage sizes and value ranges and their precision −

Type	Storage size	Value range	Precision
float	4 byte	1.2E-38 to 3.4E+38	6 decimal places
double	8 byte	2.3E-308 to 1.7E+308	15 decimal places
long double	10 byte	3.4E-4932 to 1.1E+4932	19 decimal places

The following example prints the storage space taken by a float type and its range values −

Live Demo

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <float.h>

int main(int argc, char** argv) {

    printf("Storage size for float : %d \n", sizeof(float));
    printf("FLT_MAX     :   %g\n", (float) FLT_MAX);
    printf("FLT_MIN     :   %g\n", (float) FLT_MIN);
    printf("-FLT_MAX    :   %g\n", (float) -FLT_MAX);
    printf("-FLT_MIN    :   %g\n", (float) -FLT_MIN);
    printf("DBL_MAX     :   %g\n", (double) DBL_MAX);
    printf("DBL_MIN     :   %g\n", (double) DBL_MIN);
    printf("-DBL_MAX     :  %g\n", (double) -DBL_MAX);
    printf("Precision value: %d\n", FLT_DIG );

    return 0;
}

ASCII Table Lookup - Important For Programmers & Developers

ASCII Table Lookup

ASCII stands for American Standard Code for Information Interchange. There are 128 standard ASCII codes, each of which can be represented by a 7-digit binary number: 0000000 through 1111111.

Extended ASCII adds an additional 128 characters that vary between computers, programs and fonts.

DEC	OCT	HEX	BIN	Symbol	HTML Code	Description
0	000	00	00000000	NUL	�	Null char
-
48	060	30	00110000	0	0	Zero
49	061	31	00110001	1	1	One
50	062	32	00110010	2	2	Two
51	063	33	00110011	3	3	Three
52	064	34	00110100	4	4	Four
53	065	35	00110101	5	5	Five
54	066	36	00110110	6	6	Six
55	067	37	00110111	7	7	Seven
56	070	38	00111000	8	8	Eight
57	071	39	00111001	9	9	Nine
58	072	3A	00111010	:	:	Colon
59	073	3B	00111011	;	&#59;	Semicolon
60	074	3C	00111100	<	&#60;	Less than
61	075	3D	00111101	=	&#61;	Equals
62	076	3E	00111110	>	&#62;	Greater than
63	077	3F	00111111	?	&#63;	Question mark
64	100	40	01000000	@	&#64;	At symbol
65	101	41	01000001	A	&#65;	Uppercase A
66	102	42	01000010	B	&#66;	Uppercase B
67	103	43	01000011	C	&#67;	Uppercase C
68	104	44	01000100	D	&#68;	Uppercase D
69	105	45	01000101	E	&#69;	Uppercase E
70	106	46	01000110	F	&#70;	Uppercase F
71	107	47	01000111	G	&#71;	Uppercase G
72	110	48	01001000	H	&#72;	Uppercase H
73	111	49	01001001	I	&#73;	Uppercase I
74	112	4A	01001010	J	&#74;	Uppercase J
75	113	4B	01001011	K	&#75;	Uppercase K
76	114	4C	01001100	L	&#76;	Uppercase L
77	115	4D	01001101	M	&#77;	Uppercase M
78	116	4E	01001110	N	&#78;	Uppercase N
79	117	4F	01001111	O	&#79;	Uppercase O
80	120	50	01010000	P	&#80;	Uppercase P
81	121	51	01010001	Q	&#81;	Uppercase Q
82	122	52	01010010	R	&#82;	Uppercase R
83	123	53	01010011	S	&#83;	Uppercase S
84	124	54	01010100	T	&#84;	Uppercase T
85	125	55	01010101	U	&#85;	Uppercase U
86	126	56	01010110	V	&#86;	Uppercase V
87	127	57	01010111	W	&#87;	Uppercase W
88	130	58	01011000	X	&#88;	Uppercase X
89	131	59	01011001	Y	&#89;	Uppercase Y
90	132	5A	01011010	Z	&#90;	Uppercase Z
91	133	5B	01011011	[	&#91;	Opening bracket
92	134	5C	01011100	\	&#92;	Backslash
93	135	5D	01011101	]	&#93;	Closing bracket
94	136	5E	01011110	^	&#94;	Caret - circumflex
95	137	5F	01011111	_	&#95;	Underscore
96	140	60	01100000	`	&#96;	Grave accent
97	141	61	01100001	a	&#97;	Lowercase a
98	142	62	01100010	b	&#98;	Lowercase b
99	143	63	01100011	c	&#99;	Lowercase c
100	144	64	01100100	d	&#100;	Lowercase d
101	145	65	01100101	e	&#101;	Lowercase e
102	146	66	01100110	f	&#102;	Lowercase f
103	147	67	01100111	g	&#103;	Lowercase g
104	150	68	01101000	h	&#104;	Lowercase h
105	151	69	01101001	i	&#105;	Lowercase i
106	152	6A	01101010	j	&#106;	Lowercase j
107	153	6B	01101011	k	&#107;	Lowercase k
108	154	6C	01101100	l	&#108;	Lowercase l
109	155	6D	01101101	m	&#109;	Lowercase m
110	156	6E	01101110	n	&#110;	Lowercase n
111	157	6F	01101111	o	&#111;	Lowercase o
112	160	70	01110000	p	&#112;	Lowercase p
113	161	71	01110001	q	&#113;	Lowercase q
114	162	72	01110010	r	&#114;	Lowercase r
115	163	73	01110011	s	&#115;	Lowercase s
116	164	74	01110100	t	&#116;	Lowercase t
117	165	75	01110101	u	&#117;	Lowercase u
118	166	76	01110110	v	&#118;	Lowercase v
119	167	77	01110111	w	&#119;	Lowercase w
120	170	78	01111000	x	&#120;	Lowercase x
121	171	79	01111001	y	&#121;	Lowercase y
122	172	7A	01111010	z	&#122;	Lowercase z
-