Read & Write using string (Name and Father name)

 import java.util.Scanner;
public class Main
{
public static void main(String[] args) {
String s1, s2;

Scanner scan = new Scanner(System.in);
System.out.print("Please enter your name: ");
s1 = scan.nextLine();

System.out.print("Please enter your father name: ");
s2 = scan.nextLine();

System.out.println(s1+" "+s2);
}
}

=================

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R1:Array&String

1. Write a program to read n number in an array and display it in reverse order
2. Write a program to find the sum of all elements of the array
3. Write a program to print all negative elements in an array
4. Write a program to find maximum and minimum element in an array
5. Write a program to count the total number of even and odd elements in an array
6. Write a program to merge two arrays to the third array
7. Write a program to copy the elements of one array into another array
8. Write a program to find sum of right diagonals of a matrix
9. Write a program to print an array after deleting specific element from it
10. Write a program to count frequency of specific element in an array
11. Write a program to find length of a string without using library functions
12. Write a program to concatenate two strings specific element in an array without using library functions
13. Write a program to find reverse of string
14. Write a program to remove all repeated characters from a given string
15. Write a program to read a sentence and replace lowercase characters by uppercase and vice-versa
16. Write a program to count total number of alphabets, digits or special characters in a string using loop
17. Write a program to search a character in a string using binary search
18. Write a program to read a string through keyboard and sort it using bubble sort

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Write a program to read a string through keyboard and sort it using bubble sort

Write a program to read a string through keyboard and sort it using bubble sort.

1. #include<stdio.h>
2. #include<string.h>
3.  
4. int main(){
5.    int i, j, n;
6.    char str[25][25], temp[25];
7.    printf("Enter the number of string : ");
8.    scanf("%d", &n);
9.  
10.    printf("\nEnter %d strings : \n", n);
11.    for(i=0; i<=n; i++)
12.       gets(str[i]);
13.      
14.    for(i=0; i<=n; i++)
15.       for(j=i+1; j<=n; j++) {
16.          if(strcmp(str[i], str[j])>0) {
17.             strcpy(temp, str[i]);
18.             strcpy(str[i], str[j]);
19.             strcpy(str[j], temp);
20.          }
21.       }
22.    printf("\n\nSorted Strings :");
23.    for(i=0; i<=n; i++)
24.       puts(str[i]);
25.   
26.    return 0;
27. }

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Write a program to search a character in a string using binary search

Write a program to search a character in a string using binary search.

1. #include <stdio.h>
2. #include <string.h>
3.  
4. void main()
5. {
6.     int i, n, start, end, mid;
7.     char str[100][100], key[40];
8.    
9.     printf("Please enter the number of string to be stored : ");
10.     scanf("%d",&n);
11.    
12.     printf("Enter the string in ascending order\n");
13.    
14.     for(i=0; i<=n-1; i++) {
15.         scanf("%s", &str[i]);
16.     }
17.    
18.     printf("Enter the string to be searched : ");
19.     scanf("%s", &key);
20.    
21.     start = 0;
22.     end = n-1;
23.     while(start <= end) {
24.         mid = (start+end)/2;
25.         if (strcmp(key, str[mid])==0)
26.             {
27.                 printf("key found at the position %d\n", mid+1);
28.                 exit(0);
29.             }
30.         else if
31.             (strcmp(key, str[mid])>0)
32.             {
33.                 end = end;
34.                 start = mid+1;
35.             }
36.            
37.         else {
38.                 start=start;
39.                 end = mid-1;
40.             }
41.     }
42.     printf("Failed\n");
43.  }

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Write a program to count total number of alphabets, digits or special characters in a string using loop

Write a program to count total number of alphabets, digits or special characters in a string using loop

1. #include <stdio.h>
2. #include <string.h>
3.  
4. void main()
5. {
6.     char str[100];
7.     int alph, digit, splch;
8.     int len;
9.         alph=0;
10.         digit=0;
11.         splch=0;
12.         len=0;
13.    
14.     printf("Count total number of alphabets, digits and special characters :\n");
15.     printf("Input the string : ");
16.     gets(str);
17.     len=strlen(str);
18.  
19.     for(int i=0; i < len; i++) {
20.         if ((str[i] >= 'a' && str[i] <= 'z') || (str[i] >= 'A' && str[i] <= 'Z'))
21.             alph++;
22.         else if (str[i] >= '0' && str[i] <= '9')
23.             digit++;
24.         else
25.             splch++;
26.     }
27.     //Check each character of string
28.     printf("Number of Alphabetics in the string is : %d\n", alph);
29.     printf("Number of Digits in the string is : %d\n", digit);
30.     printf("Number of Special characters in the string is : %d\n\n", splch);
31. }

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Write a program to read a sentence and replace lowercase characters by uppercase and vice-versa

Write a program to read a sentence and replace lowercase characters by uppercase and vice-versa

1. #include<stdio.h>
2. #include<string.h>
3. void main()
4. {
5.     char str[100];
6.     char ch;
7.  
8.     int len;
9.     printf("Input the string: ");
10.     gets(str);
11.     len=strlen(str);
12.  
13.     for(int i=0; i<len; i++) {
14.         ch = (islower(str[i])?toupper(str[i]):tolower(str[i]));
15.     printf("%c", ch);
16.     }
17. }

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Write a program to remove all repeated characters from a given string

Write a program to remove all repeated characters from a given string.

1. #include <stdio.h>
2. #include <string.h>
3.  
4. void main()
5. {
6.             char str[100];
7.             int i, j, k;
8.  
9.             printf("Please enter any string :  ");
10.             gets(str);
11.                        
12.             for(i = 0; i < strlen(str); i++) {
13.                         for(j = i + 1; str[j] != '\0'; j++) {
14.                                     if(str[j] == str[i]) {
15.                                                 for(k = j; str[k] != '\0'; k++) {
16.                                                             str[k] = str[k + 1];
17.                                                 }
18.                                     }
19.                         }
20.             }
21.             printf("After removing all repeated characters = %s ", str);
22. }

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Write a program to find reverse of string

Write a program to find reverse of string

1. #include<stdio.h>
2. #include<string.h>
3.  
4. void main()
5. {
6.     char str[100];
7.     char rev[100];
8.  
9.     int i, j, k;
10.  
11.     printf("Please enter a string : ");
12.     scanf("%s", str); //gets(str);
13.  
14.     for(i = 0; str[i] != '\0'; i++);
15.     {
16.         k = i-1;
17.     }
18.     for(j = 0; j <= i-1; j++)
19.     {
20.         rev[j] = str[k];
21.         k--;
22.     }
23.     printf("Reverse of the string is : %s\n", rev);
24. }

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Write a program to concatenate two strings specific element in an array without using library functions

Write a program to concatenate two strings specific element in an array without using library functions.

Using for loop

1. #include <stdio.h>
2. int main()
3. {
4.    char str1[100];
5.    char str2[100];
6.    int i, j;
7.   
8.    printf("please enter first string : ");
9.    scanf("%s", str1);
10.   
11.    printf("Please enter second string : ");
12.    scanf("%s", str2);
13.  
14.    for(i=0; str1[i] != '\0'; i++);
15.  
16.    for(j=0; str2[j] != '\0'; j++, i++) {
17.       str1[i] = str2[j];
18.    }
19.  
20.    str1[i] = '\0';
21.   
22.    printf("Concatenate is : %s", str1);
23.   
24.    return 0;
25. }

Using while loop

1. #include <stdio.h>
2. int main()
3. {
4.    char str1[100];
5.    char str2[100];
6.    int i=0, j=0;
7.   
8.    printf("please enter first string : ");
9.    scanf("%s", str1);
10.   
11.    printf("Please enter second string : ");
12.    scanf("%s", str2);
13.  
14.    while(str1[i] != '\0')
15.         i++;
16.  
17.    while(str2[j] != '\0'){
18.        str1[i] = str2[j];
19.        j++;
20.        i++;
21.    }
22.    str1[i] = '\0';
23.   
24.    printf("Concatenate is : %s", str1);
25.    return 0;
26. }

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Write a program to find length of a string without using library functions

Write a program to find length of a string without using library functions.

1. #include <stdio.h>
2. void main()
3. {
4.     char str[100];
5.     int i, len = 0;
6.  
7.     printf("Please enter a string : ");
8.     scanf("%s", str);
9.    
10.     for (i = 0; str[i] != '\0'; i++) {
11.         len++;
12.     }
13.     printf("The length of a string is : %s = %d\n", str, len);
14. }

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Reverse of string using function

Input : howAre
Output: erAwoh

#include <stdio.h>
#include <string.h>

void getInverse(char str[]);

void main()
{
    char str[100];

    printf("Please enter string ");
    scanf("%s", str);
    getInverse(str);
    printf("Inverse string %s\n", str);
}

    void getInverse(char str[]){
        int i, j;
        char t;
     
        for(i=0, j=strlen(str); i<(strlen(str)/2); i++, j--){
            t=str[i];
            str[i]=str[j-1];
            str[j-1]=t;
        }
    }

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Enter two string in separate line and output will be in one line

Input : Please enter the first string
            Alamin
            Please enter the second string
            Chowdhury
Output : Alamin Chowdhury

Used While loop

1. #include <stdio.h>
2. 
   
3. void main()
4. {
5.     char str1[100];
6.     char str2[100];
7.     char str3[100];
8.     
9.     int i=0, j=0, k=0;
10.     printf("Please enter the first string\n");
11.     //gets(str1);
12.     scanf("%s", str1);
13.     printf("Please enter the second string\n");
14.     //gets(str2);
15.     scanf("%s", str2);
16.     
17.     while(str1[i] != '\0'){
18.         str3[k]=str1[i];
19.         i++;
20.         k++;
21.     }
22.     str3[k]=' ';
23.     k++;
24.     while(str2[j] != '\0'){
25.         str3[k]=str2[j];
26.         j++;
27.         k++;
28.     }
29.     str3[k]='\0';
30.     printf("%s\n", str3);
31. }

Used for loop

1. #include <stdio.h>
2. 
   
3. void main()
4. {
5.     char str1[100];
6.     char str2[100];
7.     char str3[100];
8.     
9.     int i=0, j=0, k=0;
10.     printf("Please enter the first string\n");
11.     //gets(str1);
12.     scanf("%s", str1);
13.     printf("Please enter the second string\n");
14.     //gets(str2);
15.     scanf("%s", str2);
16.     
17.     for(str1[i] != '\0'; str3[k]=str1[i]; i++){
18.         //str3[k]=str1[i];
19.         //i++;
20.         k++;
21.     }
22.     str3[k]=' ';
23.     k++;
24.     for(str2[j] != '\0'; str3[k]=str2[j]; j++){
25.         //str3[k]=str2[j];
26.         //j++;
27.         k++;
28.     }
29.     str3[k]='\0';
30.     printf("%s\n", str3);
31. }

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Count total number of alphabets, digits and special characters

1. #include <stdio.h>
2. #include <string.h>
3. 
   
4. void main()
5. {
6.     char str[100];
7.     int alph, digit, splch;
8.     int len;
9.         alph=0;
10.         digit=0;
11.         splch=0;
12.         len=0;
13.     
14.     printf("\n\nCount total number of alphabets, digits and special characters :\n");
15.     printf("---------------------------------------\n");
16.     printf("Input the string : ");
17.     gets(str);
18.     len=strlen(str);
19.   
20.     for(int i=0; i < len; i++) {
21.         if ((str[i] >= 'a' && str[i] <= 'z') || (str[i] >= 'A' && str[i] <= 'Z'))
22.             alph++;
23.         else if (str[i] >= '0' && str[i] <= '9')
24.             digit++;
25.         else
26.             splch++;
27.     }
28.     //Check each character of string
29.     printf("Number of Alphabetics in the string is : %d\n", alph);
30.     printf("Number of Digits in the string is : %d\n", digit);
31.     printf("Number of Special characters in the string is : %d\n\n", splch);
32. }

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Convert lowercase to uppercase or vice versa

Input: aLAMiN
Output: AlamIn

1. #include<stdio.h>
2. #include<string.h>
3. void main()
4. {
5.     char str[100];
6.     char ch;
7. 
   
8.     int len;
9.     printf("Input the string: ");
10.     gets(str);
11.     len=strlen(str);
12. 
    
13.     for(int i=0; i<len; i++) {
14.         ch = (islower(str[i])?toupper(str[i]):tolower(str[i]));
15.     printf("%c", ch);
16.     }
17. }

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