C Program to perform string operations

#include <stdio.h>
#include<conio.h>
#include<string.h>
#include<ctype.h>
#include<stdlib.h>

int length(char str[]);
void reverse(char str[]);
int palindrome(char str[]);
void copy(char str1[], char str2[]);
int compare(char str1[], char str2[]);
void concat(char str1[], char str2[]);
void search(char str1[], char str2[]);
void count(char str1[]);

void main() {
   char a[100], b[100];
   int result, option;
   do {
      printf("\n1.Length of a string");
      printf("\n2.Reverse the Given String");
      printf("\n3.Check for Palindrome");
      printf("\n4.Copy");
      printf("\n5.String Comparison");
      printf("\n6.String Concatenation");
      printf("\n7.String Searching");
      printf("\n8.Counting of Words,Characters & Special Characters");
      printf("\n9.Quit");
      printf("\n\nEnter Your Choice:");
      scanf("%d", &option);

      flushall();
      switch (option) {
      case 1:
         printf("\nEnter a String:");
         gets(a);
         result = length(a);
         printf("\nLength of %s=%d", a, result);
         printf("\nPress a Character");
         getch();
         break;

      case 2:
         printf("\nEnter a String:");
         gets(a);
         reverse(a);
         printf("\nResult=%s", a);
         printf("\nPress a Character");
         getch();
         break;

      case 3:
         printf("\n Enter a String:");
         gets(a);
         result = palindrome(a);
         if (result == 0)
            printf("\nNot a palindrome");
         else
            printf("\nA palindrome");
         printf("\nPress a Character");
         getch();
         break;

      case 4:
         printf("\nEnter a String:");
         gets(a);
         copy(b, a);
         printf("\nResult=%s", b);
         printf("\nPress a Character");
         getch();
         break;

      case 5:
         printf("\nEnter 1st string:");
         gets(a);
         printf("\nEnter 2nd string:");
         gets(b);
         result = compare(a, b);
         if (result == 0)
            printf("\nboth are same");
         else if (result > 0)
            printf("\n1st>2nd");
         else
            printf("\n1st<2nd");
         printf("\nPress a Character");
         getch();
         break;

      case 6:
         printf("\nEnter 1st string:");
         gets(a);
         printf("\nEnter 2nd string:");
         gets(b);
         concat(a, b);
         printf("\nresult=%s", a);
         printf("\nPress a Character");
         getch();
         break;

      case 7:
         printf("\nEnter 1st string:");
         gets(a);
         printf("\nEnter 2nd string:");
         gets(b);
         search(a, b);
         printf("\nPress a Character");
         getch();
         break;

      case 8:
         printf("\nEnter a string:");
         gets(a);
         count(a);
         printf("\nPress a Character");
         getch();
         break;

      default:
         printf("\nInvalid Choice:");
         break;
      }

   } while (option != 9);
}

int length(char str[]) {
   int i = 0;
   while (str[i] != '\0')
      i++;
   return (i);
}

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--;
   }
}

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);
}

void copy(char str2[], char str1[]) {
   int i = 0;
   while (str1[i] != '\0') {
      str2[i] = str1[i];
      i++;
   }
   str2[i] = '\0';
}

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 concat(char str1[], char str2[]) {
   int i, j;
   i = 0;
   while (str1[i] != '\0')
      i++;
   for (j = 0; str2[j] != '\0'; i++, j++)
      str1[i] = str2[j];
   str1[i] = '\0';
}

void search(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);
   }
}

void count(char str[]) {
   int words = 0, characters = 0, spchar = 0, i;
   for (i = 0; str[i] != '\0'; i++) {
      if (isalnum(str[i]) && (i == 0 || !isalnum(str[i - 1])))
         words++;
      characters++;
      if (!isalnum(str[i]) && !isspace(str[i]))
         spchar++;
   }
   printf("\nNo of characters = %d", characters);
   printf("\nNo of special characters = %d", spchar);
   printf("\nNo of words = %d", words);
}

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#include <stdio.h>

#include<conio.h>

#include<string.h>

#include<ctype.h>

#include<stdlib.h>

int length(char str[]);

void reverse(char str[]);

int palindrome(char str[]);

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

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

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

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

void count(char str1[]);

void main() {

char a[100], b[100];

int result, option;

do {

printf("\n1.Length of a string");

printf("\n2.Reverse the Given String");

printf("\n3.Check for Palindrome");

printf("\n4.Copy");

printf("\n5.String Comparison");

printf("\n6.String Concatenation");

printf("\n7.String Searching");

printf("\n8.Counting of Words,Characters & Special Characters");

printf("\n9.Quit");

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

scanf("%d", &option);

flushall();

switch (option) {

case 1:

printf("\nEnter a String:");

gets(a);

result = length(a);

printf("\nLength of %s=%d", a, result);

printf("\nPress a Character");

getch();

break;

case 2:

printf("\nEnter a String:");

gets(a);

reverse(a);

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

printf("\nPress a Character");

getch();

break;

case 3:

printf("\n Enter a String:");

gets(a);

result = palindrome(a);

if (result == 0)

printf("\nNot a palindrome");

else

printf("\nA palindrome");

printf("\nPress a Character");

getch();

break;

case 4:

printf("\nEnter a String:");

gets(a);

copy(b, a);

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

printf("\nPress a Character");

getch();

break;

case 5:

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

gets(a);

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

gets(b);

result = compare(a, b);

if (result == 0)

printf("\nboth are same");

else if (result > 0)

printf("\n1st>2nd");

else

printf("\n1st<2nd");

printf("\nPress a Character");

getch();

break;

case 6:

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

gets(a);

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

gets(b);

concat(a, b);

printf("\nresult=%s", a);

printf("\nPress a Character");

getch();

break;

case 7:

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

gets(a);

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

gets(b);

search(a, b);

printf("\nPress a Character");

getch();

break;

case 8:

printf("\nEnter a string:");

gets(a);

count(a);

printf("\nPress a Character");

getch();

break;

default:

printf("\nInvalid Choice:");

break;

}

} while (option != 9);

}

int length(char str[]) {

int i = 0;

while (str[i] != '\0')

i++;

return (i);

}

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--;

}

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);

}

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

int i = 0;

while (str1[i] != '\0') {

str2[i] = str1[i];

i++;

}

str2[i] = '\0';

}

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 concat(char str1[], char str2[]) {

int i, j;

i = 0;

while (str1[i] != '\0')

i++;

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

str1[i] = str2[j];

str1[i] = '\0';

}

void search(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);

}

void count(char str[]) {

int words = 0, characters = 0, spchar = 0, i;

for (i = 0; str[i] != '\0'; i++) {

if (isalnum(str[i]) && (i == 0 || !isalnum(str[i - 1])))

words++;

characters++;

if (!isalnum(str[i]) && !isspace(str[i]))

spchar++;

}

printf("\nNo of characters = %d", characters);

printf("\nNo of special characters = %d", spchar);

printf("\nNo of words = %d", words);

}

Output :

1.Length of a string
2.Reverse the Given String
3.Check for Palindrome
4.Copy
5.String Comparison
6.String Concatenation
7.String Searching
8.Counting of Words,Characters & Special Characters
9.Quit

Enter Your Choice:1
Enter a String:pritesh
Length of pritesh=7
Press a Character

1.Length of a string
2.Reverse the Given String
3.Check for Palindrome
4.Copy
5.String Comparison
6.String Concatenation
7.String Searching
8.Counting of Words,Characters & Special Characters
9.Quit

Enter Your Choice:2
Enter a String:pritesh
Result = hsetirp
Press a Character

1.Length of a string
2.Reverse the Given String
3.Check for Palindrome
4.Copy
5.String Comparison
6.String Concatenation
7.String Searching
8.Counting of Words,Characters & Special Characters
9.Quit

Enter Your Choice:3
Enter a String:madam
A palindrome
Press a Character

1.Length of a string
2.Reverse the Given String
3.Check for Palindrome
4.Copy
5.String Comparison
6.String Concatenation
7.String Searching
8.Counting of Words,Characters & Special Characters
9.Quit

Enter Your Choice:4
Enter a String:pritesh
Result=pritesh
Press a Character

1.Length of a string
2.Reverse the Given String
3.Check for Palindrome
4.Copy
5.String Comparison
6.String Concatenation
7.String Searching
8.Counting of Words,Characters & Special Characters
9.Quit

Enter Your Choice:5
Enter 1st string:pri
Enter 2nd string:pri
both are same
Press a Character

1.Length of a string
2.Reverse the Given String
3.Check for Palindrome
4.Copy
5.String Comparison
6.String Concatenation
7.String Searching
8.Counting of Words,Characters & Special Characters
9.Quit

Enter Your Choice:6
Enter 1st string:prite
Enter 2nd string:sh
result=pritesh
Press a Character

1.Length of a string
2.Reverse the Given String
3.Check for Palindrome
4.Copy
5.String Comparison
6.String Concatenation
7.String Searching
8.Counting of Words,Characters & Special Characters
9.Quit

Enter Your Choice:7
Enter 1st string:pritesh
Enter 2nd string:pri
String found at location : 1
Press a Character

1.Length of a string
2.Reverse the Given String
3.Check for Palindrome
4.Copy
5.String Comparison
6.String Concatenation
7.String Searching
8.Counting of Words,Characters & Special Characters
9.Quit

Enter Your Choice:8
Enter a string:pri@20110
No of characters = 9
No of special characters = 1
No of words = 2
Press a Character

1.Length of a string
2.Reverse the Given String
3.Check for Palindrome
4.Copy
5.String Comparison
6.String Concatenation
7.String Searching
8.Counting of Words,Characters & Special Characters
9.Quit

Enter Your Choice:9

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1.Length of a string

2.Reverse the Given String

3.Check for Palindrome

4.Copy

5.String Comparison

6.String Concatenation

7.String Searching

8.Counting of Words,Characters & Special Characters

9.Quit

Enter Your Choice:1

Enter a String:pritesh

Length of pritesh=7

Press a Character

1.Length of a string

2.Reverse the Given String

3.Check for Palindrome

4.Copy

5.String Comparison

6.String Concatenation

7.String Searching

8.Counting of Words,Characters & Special Characters

9.Quit

Enter Your Choice:2

Enter a String:pritesh

Result = hsetirp

Press a Character

1.Length of a string

2.Reverse the Given String

3.Check for Palindrome

4.Copy

5.String Comparison

6.String Concatenation

7.String Searching

8.Counting of Words,Characters & Special Characters

9.Quit

Enter Your Choice:3

Enter a String:madam

A palindrome

Press a Character

1.Length of a string

2.Reverse the Given String

3.Check for Palindrome

4.Copy

5.String Comparison

6.String Concatenation

7.String Searching

8.Counting of Words,Characters & Special Characters

9.Quit

Enter Your Choice:4

Enter a String:pritesh

Result=pritesh

Press a Character

1.Length of a string

2.Reverse the Given String

3.Check for Palindrome

4.Copy

5.String Comparison

6.String Concatenation

7.String Searching

8.Counting of Words,Characters & Special Characters

9.Quit

Enter Your Choice:5

Enter 1st string:pri

Enter 2nd string:pri

both are same

Press a Character

1.Length of a string

2.Reverse the Given String

3.Check for Palindrome

4.Copy

5.String Comparison

6.String Concatenation

7.String Searching

8.Counting of Words,Characters & Special Characters

9.Quit

Enter Your Choice:6

Enter 1st string:prite

Enter 2nd string:sh

result=pritesh

Press a Character

1.Length of a string

2.Reverse the Given String

3.Check for Palindrome

4.Copy

5.String Comparison

6.String Concatenation

7.String Searching

8.Counting of Words,Characters & Special Characters

9.Quit

Enter Your Choice:7

Enter 1st string:pritesh

Enter 2nd string:pri

String found at location : 1

Press a Character

1.Length of a string

2.Reverse the Given String

3.Check for Palindrome

4.Copy

5.String Comparison

6.String Concatenation

7.String Searching

8.Counting of Words,Characters & Special Characters

9.Quit

Enter Your Choice:8

Enter a string:pri@20110

No of characters = 9

No of special characters = 1

No of words = 2

Press a Character

1.Length of a string

2.Reverse the Given String

3.Check for Palindrome

4.Copy

5.String Comparison

6.String Concatenation

7.String Searching

8.Counting of Words,Characters & Special Characters

9.Quit

Enter Your Choice:9

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C Program to perform string operations