C Program for Array of Structures

Create a database using an array of structures and perform the following operations on it

1. Create 2. Add 3. Search 4. Update 5. Delete

#include<stdio.h>

#include<string.h>

#include<stdlib.h>

struct student

{

      int rno,marks,del;

      char name[20];

};

void create(int,struct student []);

void add(int,struct student []);

void display(int,struct student []);

void search(int,int,struct student []);

void update(int,int,struct student []);

void delet(int,int,struct student []);

 int main()

{

      setbuf(stdout, NULL);

      int n,value,choice;

      struct student s[10];

      setbuf(stdout, NULL);

      printf("\n\t\t**STUDENT DATABASE**\n");

      printf("\n\tEnter the number of students >");

      scanf("%d",&n);

      create(n,s);

      do

      {

      printf("\n\n----------------------------MENU----------------------------");

      printf("\n\t1:ADD\n\t2:Display\n\t3:Search\n\t4:Update\n\t5:Delete\n\t\n\n\tEnter your choice\t>>");

      scanf("%d",&choice);

      printf("------------------------------------------------------------  \n");

      switch(choice)

      {

      case 1:

            n=n+1;

            add(n,s);

            break;

      case 2:

            printf("\n\tRollNo\tNAME\tMARKS \n");

            display(n,s);

            break;

      case 3:

            printf("\n\tEnter the RollNo. to Search   >");

            scanf("%d",&value);

            search(n,value,s);

            break;

      case 4:

            printf("\n\tEnter the RollNo. to Update   >");

            scanf("%d",&value);

            update(n,value,s);

            break;

      case 5:

            printf("\n\tEnter the RollNo. to Delete   >");

            scanf("%d",&value);

            delet(n,value,s);

            break;

      }

      }while(choice!=0);

      printf("\n");

      return 0;

}

void create(int n,struct student s[10])

{

      int i,j;

      for (i=0;i<n;i++)

      {

      printf("\n\tEnter the RollNo. >>");

      scanf("%d",&s[i].rno);

      printf("\tEnter NAME  >>");

      scanf("%s",s[i].name);

      printf("\tEnter Marks  >>");

      scanf("%d",&s[i].marks);

      s[i].del=0;

      }

}

void add(int n,struct student s[10])

{

      int i,j;

      for (i=n-1;i<n;i++)

      {

      printf("\n\tEnter the RollNo. >>");

      scanf("%d",&s[i].rno);

      printf("\tEnter NAME  >>");

      scanf("%s",s[i].name);

      printf("\tEnter Marks  >>");

      scanf("%d",&s[i].marks);

      s[i].del=0;

      }    

}

void display(int n,struct student s[10])

{

      int i;

      for (i=0;i<n;i++)

      {

            if(s[i].del==0)

                  printf("\n\t%d\t%s\t%d",s[i].rno,s[i].name,s[i].marks);

      }

}

void search(int n,int value,struct student s[10])

{

      int i;

      for (i=0;i<n;i++)

      {

            if (value==s[i].rno)

            {

            printf("\n\tRollNo\tMARKS\tNAME ");

            printf("\n\t%d\t%s\t%d",s[i].rno,s[i].name,s[i].marks);

            break;

            }

      }

      if (i==n)

          printf("\n\tNO RECORD FOUND");

}

void update(int n,int value,struct student s[10])

{

      int i,j;

      for (i=0;i<n;i++)

      {

            if (value==s[i].rno)

            {

            printf("\n\tEnter the RollNo. & NAME & MARKS of student  \n\t");

            scanf("%d%s%d",&s[i].rno,s[i].name,&s[i].marks);

            break;

            }

      }

      if (i==n)

          printf("\n\tNO RECORD TO UPDATE ");  

}

void delet(int n,int value,struct student s[10])

{

      int i;

      for (i=0;i<n;i++)

      {

            if (value==s[i].rno)

            {

            printf("\n\t----------------------");

            printf("\n\tRollNo\tMARKS\tNAME ");

            printf("\n\t%d\t%s\t%d",s[i].rno,s[i].name,s[i].marks);

            printf("\n\t----------------------");

            printf("\n\tSure to delete: 1=YES/2=NO  >");

            scanf("%d",&s[i].del);

            break;

            }

      }

}

Output:

**STUDENT DATABASE** Enter the number of students >2 Enter the RollNo. >>1 Enter NAME  >>a Enter Marks  >>11 Enter the RollNo. >>2 Enter NAME  >>b Enter Marks  >>22
----------------------------MENU---------------------------- 1:ADD 2:Display 3:Search 4:Update 5:Delete Enter your choice >>1------------------------------------------------------------   Enter the RollNo. >>3 Enter NAME  >>c Enter Marks  >>33
----------------------------MENU---------------------------- 1:ADD 2:Display 3:Search 4:Update 5:Delete Enter your choice >>2------------------------------------------------------------   RollNo NAME MARKS  1 a 11 2 b 22 3 c 33----------------------------MENU---------------------------- 1:ADD 2:Display 3:Search 4:Update 5:Delete Enter your choice >>3------------------------------------------------------------   Enter the RollNo. to Search >2 RollNo MARKS NAME  2 b 22----------------------------MENU---------------------------- 1:ADD 2:Display 3:Search 4:Update 5:Delete Enter your choice >>4------------------------------------------------------------   Enter the RollNo. to Update >3 Enter the RollNo. & NAME & MARKS of student   3cc33
----------------------------MENU---------------------------- 1:ADD 2:Display 3:Search 4:Update 5:Delete Enter your choice >>2------------------------------------------------------------   RollNo NAME MARKS  1 a 11 2 b 22 3 cc 33----------------------------MENU---------------------------- 1:ADD 2:Display 3:Search 4:Update 5:Delete Enter your choice >>5------------------------------------------------------------   Enter the RollNo. to Delete >3 ---------------------- RollNo MARKS NAME  3 cc 33 ---------------------- Sure to delete: 1=YES/2=NO  >1
----------------------------MENU---------------------------- 1:ADD 2:Display 3:Search 4:Update 5:Delete Enter your choice >>2------------------------------------------------------------   RollNo NAME MARKS  1 a 11 2 b 22----------------------------MENU---------------------------- 1:ADD 2:Display 3:Search 4:Update 5:Delete Enter your choice >>

C program for operation on String

Implement following operations on the string (without library string)

1. Length 2. Palindrome 3. Comparison 4. Copy 5. Reverse      6. Substring

#include <stdio.h>

void substr(char str1[], char str2[]);

int palindrome(char str[]);

int compare(char str1[], char str2[]);

void copy(char str1[], char str2[]);

void reverse(char str[]);

int main()

{

      setbuf(stdout, NULL);

      char str1[100], str2[100];

      int result, option;

      do {

            printf("\n1.Substring Searching");

            printf("\n2.Check for Palindrome");

            printf("\n3.String Comparison");

            printf("\n4.Copy string");

            printf("\n5.Reverse String");

            printf("\n6.Quit");

            printf("\n\nEnter Your Choice:");

            scanf("%d", &option);

            switch (option)

            {

            case 1:

                  printf("\nEnter 1st string:");

                  scanf("%s",&str1);

                  printf("\nEnter 2nd string:");

                  scanf("%s",&str2);

                  substr(str1, str2);

                  break;

            case 2:

                  printf("\nEnter a String:");

                  scanf("%s",&str1);

                  result = palindrome(str1);

                  if (result == 0)

                        printf("\nNot a palindrome");

                  else

                        printf("\nIt is palindrome");

                  break;

            case 3:

                  printf("\nEnter 1st string:");

                  scanf("%s",&str1);

                  printf("\nEnter 2nd string:");

                  scanf("%s",&str2);

                  result = compare(str1, str2);

                  if (result == 0)

                        printf("\nboth are same");

                  else if (result > 0)

                        printf("\n1st>2nd");

                  else

                        printf("\n1st<2nd");

                  break;

                  case 4:

                        printf("\nEnter a String:");

                        scanf("%s",&str1);

                        copy(str2, str1);

                        printf("\nResult=%s", str2);

                        break;

                  case 5:

                        printf("\nEnter a String:");scanf("%s",&str1);

                        reverse(str1);

                        printf("\nResult=%s", str1);

                        break;

                  default:

                        printf("\nInvalid Choice:");

                        break;

            }

      } while (option != 6);

      return 0;

}

void substr(char str1[], char str2[])

{

      int i, j, lena, lenb;

      for (lena = 0; str1[lena] != '\0'; lena++);

      for (lenb = 0; str2[lenb] != '\0'; lenb++);

      for (i = 0; i <= lena - lenb + 1; i++) {

            for (j = 0; str1[i + j] == str2[j] && str2[j] != '\0'; j++);

            if (str2[j] == '\0')

                  printf("\nString found at location : %d", i + 1);

      }

}

int palindrome(char str[])

{

      int i, j;

      i = j = 0;

      while (str[j] != '\0')

            j++;

      while (i < j) {

            if (str[i] != str[j - 1])

                  return (0);

            i++;

            j--;

      }

      return (1);

}

int compare(char str1[], char str2[])

{

      int i;

      i = 0;

      while (str1[i] != '\0') {

            if (str1[i] > str2[i])

                  return (1);

            if (str1[i] < str2[i])

                  return (-1);

            i++;

      }

      return (0);

}

void copy(char str2[], char str1[])

{

      int i = 0;

      while (str1[i] != '\0') {

            str2[i] = str1[i];

            i++;

      }

      str2[i] = '\0';

}

void reverse(char str[])

{

      int i, j;

      char temp;

      i = j = 0;

      while (str[j] != '\0')

            j++;

      j--;

      while (i < j) {

            temp = str[i];

            str[i] = str[j];

            str[j] = temp;

            i++;

            j--;

      }

}

Output

1.Substring Searching

2.Check for Palindrome

3.String Comparison

4.Copy string

5.Reverse String

6.Quit

Enter Your Choice:1

Enter 1st string:madam

Enter 2nd string:am

String found at location : 4

1.Substring Searching

2.Check for Palindrome

3.String Comparison

4.Copy string

5.Reverse String

6.Quit

Enter Your Choice:2

 Enter a String:madam

A palindrome

1.Substring Searching

2.Check for Palindrome

3.String Comparison

4.Copy string

5.Reverse String

6.Quit

Enter Your Choice:3

Enter 1st string:Mam

Enter 2nd string:mam

1st<2nd

1.Substring Searching

2.Check for Palindrome

3.String Comparison

4.Copy string

5.Reverse String

6.Quit

Enter Your Choice:4

Enter a String:hello

Result=hello

1.Substring Searching

2.Check for Palindrome

3.String Comparison

4.Copy string

5.Reverse String

6.Quit

Enter Your Choice:5

Enter a String:hello

Result=olleh

1.Substring Searching

2.Check for Palindrome

3.String Comparison

4.Copy string

5.Reverse String

6.Quit

Enter Your Choice:6

Invalid Choice: