Convert a String from LowerTo Upper (vice-versa) without using type casting or built-in functions in Java...
How can we convert a String from lower to upper (Vice-versa ) in Java
without using any built-in function or using any type casting ?
java
asked Nov 14 '18 at 15:23
JayJay
64
closed as too broad by achAmháin, kryger, GriffeyDog, oleg.cherednik, gnat Nov 15 '18 at 5:56
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
add a comment |
How can we convert a String from lower to upper (Vice-versa ) in Java
without using any built-in function or using any type casting ?
java
asked Nov 14 '18 at 15:23
JayJay
64
closed as too broad by achAmháin, kryger, GriffeyDog, oleg.cherednik, gnat Nov 15 '18 at 5:56
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
1
A rather large loop through your String...if(str.charAt(i) == 'a'...), or perhaps view the source code of theStringclass and find the method that does this already...or does this count as using the inbuiltcharAtmethod? Or have a map of all characters lower case and upper case and have the values as the opposite.
– achAmháin
Nov 14 '18 at 15:25
add a comment |
How can we convert a String from lower to upper (Vice-versa ) in Java
without using any built-in function or using any type casting ?
java
asked Nov 14 '18 at 15:23
JayJay
64
How can we convert a String from lower to upper (Vice-versa ) in Java
without using any built-in function or using any type casting ?
java
java
asked Nov 14 '18 at 15:23
JayJay
64
asked Nov 14 '18 at 15:23
JayJay
64
asked Nov 14 '18 at 15:23
JayJay
64
asked Nov 14 '18 at 15:23
JayJay
64
asked Nov 14 '18 at 15:23
JayJay
64
64
closed as too broad by achAmháin, kryger, GriffeyDog, oleg.cherednik, gnat Nov 15 '18 at 5:56
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
closed as too broad by achAmháin, kryger, GriffeyDog, oleg.cherednik, gnat Nov 15 '18 at 5:56
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
1
A rather large loop through your String...if(str.charAt(i) == 'a'...), or perhaps view the source code of theStringclass and find the method that does this already...or does this count as using the inbuiltcharAtmethod? Or have a map of all characters lower case and upper case and have the values as the opposite.
– achAmháin
Nov 14 '18 at 15:25
add a comment |
1
A rather large loop through your String...if(str.charAt(i) == 'a'...), or perhaps view the source code of theStringclass and find the method that does this already...or does this count as using the inbuiltcharAtmethod? Or have a map of all characters lower case and upper case and have the values as the opposite.
– achAmháin
Nov 14 '18 at 15:25
1
1
A rather large loop through your String...
if(str.charAt(i) == 'a'...) , or perhaps view the source code of the String class and find the method that does this already...or does this count as using the inbuilt charAt method? Or have a map of all characters lower case and upper case and have the values as the opposite.– achAmháin
Nov 14 '18 at 15:25
A rather large loop through your String...
if(str.charAt(i) == 'a'...) , or perhaps view the source code of the String class and find the method that does this already...or does this count as using the inbuilt charAt method? Or have a map of all characters lower case and upper case and have the values as the opposite.– achAmháin
Nov 14 '18 at 15:25
add a comment |
2 Answers
2
active
oldest
votes
public static String toUpperCase(String str) {
char arr = str.toCharArray();
for (int i = 0; i < arr.length; i++)
if (arr[i] >= 'a' && arr[i] <= 'z')
arr[i] -= 'a' - 'A';
return new String(arr);
}
public static String toLowerCase(String str) {
char arr = str.toCharArray();
for (int i = 0; i < arr.length; i++)
if (arr[i] >= 'A' && arr[i] <= 'Z')
arr[i] += 'a' - 'A';
return new String(arr);
}
answered Nov 14 '18 at 15:54
oleg.cherednikoleg.cherednik
6,92921118
add a comment |
You can use ASCII values to change cases. in your case converting lower case alphabets to upper case loweer case a has ASCII value 97 and z has 122 and if these number is exactly subtracted by 32 then it will be equal to ASCII value of its uppercase letter like 97-32=65 is ASCII value of A. Hope this helps.
public class toUpperCase{
public static void main(String args){
toUpperCase(args[0]);
}
//for lower to upper case
public static void toUpperCase(String a){
for (int i = 0; i< a.length(); i++){
char aChar = a.charAt(i);
if (97 <= aChar && aChar<=122){
aChar = (char)( (aChar - 32) );
}
System.out.print(aChar);
}
}
//for upper to lower case
public static void toUpperCase(String a){
for (int i = 0; i< a.length(); i++){
char aChar = a.charAt(i);
if (65 <= aChar && aChar<= 97){
aChar = (char)( (aChar + 32) );
}
System.out.print(aChar);
}
}
}
But, again it needs typecasting.
for ASCII values check ASCII Table
answered Nov 14 '18 at 15:32
BhandariBhandari
162213
Check your code, it does not works!aChargoes nowhere
– oleg.cherednik
Nov 14 '18 at 15:57
Thanks for letting me know we should print aChar
– Bhandari
Nov 14 '18 at 16:01
add a comment |
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
public static String toUpperCase(String str) {
char arr = str.toCharArray();
for (int i = 0; i < arr.length; i++)
if (arr[i] >= 'a' && arr[i] <= 'z')
arr[i] -= 'a' - 'A';
return new String(arr);
}
public static String toLowerCase(String str) {
char arr = str.toCharArray();
for (int i = 0; i < arr.length; i++)
if (arr[i] >= 'A' && arr[i] <= 'Z')
arr[i] += 'a' - 'A';
return new String(arr);
}
answered Nov 14 '18 at 15:54
oleg.cherednikoleg.cherednik
6,92921118
add a comment |
public static String toUpperCase(String str) {
char arr = str.toCharArray();
for (int i = 0; i < arr.length; i++)
if (arr[i] >= 'a' && arr[i] <= 'z')
arr[i] -= 'a' - 'A';
return new String(arr);
}
public static String toLowerCase(String str) {
char arr = str.toCharArray();
for (int i = 0; i < arr.length; i++)
if (arr[i] >= 'A' && arr[i] <= 'Z')
arr[i] += 'a' - 'A';
return new String(arr);
}
answered Nov 14 '18 at 15:54
oleg.cherednikoleg.cherednik
6,92921118
add a comment |
public static String toUpperCase(String str) {
char arr = str.toCharArray();
for (int i = 0; i < arr.length; i++)
if (arr[i] >= 'a' && arr[i] <= 'z')
arr[i] -= 'a' - 'A';
return new String(arr);
}
public static String toLowerCase(String str) {
char arr = str.toCharArray();
for (int i = 0; i < arr.length; i++)
if (arr[i] >= 'A' && arr[i] <= 'Z')
arr[i] += 'a' - 'A';
return new String(arr);
}
answered Nov 14 '18 at 15:54
oleg.cherednikoleg.cherednik
6,92921118
public static String toUpperCase(String str) {
char arr = str.toCharArray();
for (int i = 0; i < arr.length; i++)
if (arr[i] >= 'a' && arr[i] <= 'z')
arr[i] -= 'a' - 'A';
return new String(arr);
}
public static String toLowerCase(String str) {
char arr = str.toCharArray();
for (int i = 0; i < arr.length; i++)
if (arr[i] >= 'A' && arr[i] <= 'Z')
arr[i] += 'a' - 'A';
return new String(arr);
}
answered Nov 14 '18 at 15:54
oleg.cherednikoleg.cherednik
6,92921118
edited Nov 14 '18 at 16:21
answered Nov 14 '18 at 15:54
oleg.cherednikoleg.cherednik
6,92921118
answered Nov 14 '18 at 15:54
oleg.cherednikoleg.cherednik
6,92921118
answered Nov 14 '18 at 15:54
oleg.cherednikoleg.cherednik
6,92921118
6,92921118
add a comment |
add a comment |
You can use ASCII values to change cases. in your case converting lower case alphabets to upper case loweer case a has ASCII value 97 and z has 122 and if these number is exactly subtracted by 32 then it will be equal to ASCII value of its uppercase letter like 97-32=65 is ASCII value of A. Hope this helps.
public class toUpperCase{
public static void main(String args){
toUpperCase(args[0]);
}
//for lower to upper case
public static void toUpperCase(String a){
for (int i = 0; i< a.length(); i++){
char aChar = a.charAt(i);
if (97 <= aChar && aChar<=122){
aChar = (char)( (aChar - 32) );
}
System.out.print(aChar);
}
}
//for upper to lower case
public static void toUpperCase(String a){
for (int i = 0; i< a.length(); i++){
char aChar = a.charAt(i);
if (65 <= aChar && aChar<= 97){
aChar = (char)( (aChar + 32) );
}
System.out.print(aChar);
}
}
}
But, again it needs typecasting.
for ASCII values check ASCII Table
answered Nov 14 '18 at 15:32
BhandariBhandari
162213
Check your code, it does not works!aChargoes nowhere
– oleg.cherednik
Nov 14 '18 at 15:57
Thanks for letting me know we should print aChar
– Bhandari
Nov 14 '18 at 16:01
add a comment |
You can use ASCII values to change cases. in your case converting lower case alphabets to upper case loweer case a has ASCII value 97 and z has 122 and if these number is exactly subtracted by 32 then it will be equal to ASCII value of its uppercase letter like 97-32=65 is ASCII value of A. Hope this helps.
public class toUpperCase{
public static void main(String args){
toUpperCase(args[0]);
}
//for lower to upper case
public static void toUpperCase(String a){
for (int i = 0; i< a.length(); i++){
char aChar = a.charAt(i);
if (97 <= aChar && aChar<=122){
aChar = (char)( (aChar - 32) );
}
System.out.print(aChar);
}
}
//for upper to lower case
public static void toUpperCase(String a){
for (int i = 0; i< a.length(); i++){
char aChar = a.charAt(i);
if (65 <= aChar && aChar<= 97){
aChar = (char)( (aChar + 32) );
}
System.out.print(aChar);
}
}
}
But, again it needs typecasting.
for ASCII values check ASCII Table
answered Nov 14 '18 at 15:32
BhandariBhandari
162213
Check your code, it does not works!aChargoes nowhere
– oleg.cherednik
Nov 14 '18 at 15:57
Thanks for letting me know we should print aChar
– Bhandari
Nov 14 '18 at 16:01
add a comment |
You can use ASCII values to change cases. in your case converting lower case alphabets to upper case loweer case a has ASCII value 97 and z has 122 and if these number is exactly subtracted by 32 then it will be equal to ASCII value of its uppercase letter like 97-32=65 is ASCII value of A. Hope this helps.
public class toUpperCase{
public static void main(String args){
toUpperCase(args[0]);
}
//for lower to upper case
public static void toUpperCase(String a){
for (int i = 0; i< a.length(); i++){
char aChar = a.charAt(i);
if (97 <= aChar && aChar<=122){
aChar = (char)( (aChar - 32) );
}
System.out.print(aChar);
}
}
//for upper to lower case
public static void toUpperCase(String a){
for (int i = 0; i< a.length(); i++){
char aChar = a.charAt(i);
if (65 <= aChar && aChar<= 97){
aChar = (char)( (aChar + 32) );
}
System.out.print(aChar);
}
}
}
But, again it needs typecasting.
for ASCII values check ASCII Table
answered Nov 14 '18 at 15:32
BhandariBhandari
162213
You can use ASCII values to change cases. in your case converting lower case alphabets to upper case loweer case a has ASCII value 97 and z has 122 and if these number is exactly subtracted by 32 then it will be equal to ASCII value of its uppercase letter like 97-32=65 is ASCII value of A. Hope this helps.
public class toUpperCase{
public static void main(String args){
toUpperCase(args[0]);
}
//for lower to upper case
public static void toUpperCase(String a){
for (int i = 0; i< a.length(); i++){
char aChar = a.charAt(i);
if (97 <= aChar && aChar<=122){
aChar = (char)( (aChar - 32) );
}
System.out.print(aChar);
}
}
//for upper to lower case
public static void toUpperCase(String a){
for (int i = 0; i< a.length(); i++){
char aChar = a.charAt(i);
if (65 <= aChar && aChar<= 97){
aChar = (char)( (aChar + 32) );
}
System.out.print(aChar);
}
}
}
But, again it needs typecasting.
for ASCII values check ASCII Table
answered Nov 14 '18 at 15:32
BhandariBhandari
162213
edited Nov 15 '18 at 7:02
answered Nov 14 '18 at 15:32
BhandariBhandari
162213
answered Nov 14 '18 at 15:32
BhandariBhandari
162213
answered Nov 14 '18 at 15:32
BhandariBhandari
162213
162213
Check your code, it does not works!aChargoes nowhere
– oleg.cherednik
Nov 14 '18 at 15:57
Thanks for letting me know we should print aChar
– Bhandari
Nov 14 '18 at 16:01
add a comment |
Check your code, it does not works!aChargoes nowhere
– oleg.cherednik
Nov 14 '18 at 15:57
Thanks for letting me know we should print aChar
– Bhandari
Nov 14 '18 at 16:01
Check your code, it does not works!
aChar goes nowhere– oleg.cherednik
Nov 14 '18 at 15:57
Check your code, it does not works!
aChar goes nowhere– oleg.cherednik
Nov 14 '18 at 15:57
Thanks for letting me know we should print aChar
– Bhandari
Nov 14 '18 at 16:01
Thanks for letting me know we should print aChar
– Bhandari
Nov 14 '18 at 16:01
add a comment |
1
A rather large loop through your String...
if(str.charAt(i) == 'a'...), or perhaps view the source code of theStringclass and find the method that does this already...or does this count as using the inbuiltcharAtmethod? Or have a map of all characters lower case and upper case and have the values as the opposite.– achAmháin
Nov 14 '18 at 15:25