C Using library function

Delete all occurrences of Character from the String

#include

#include

#include

void del(char str[], char ch);

void main()

{

   char str[10];

   char ch;

   printf("\nEnter the string : ");

   gets(str);

   printf("\nEnter character which you want to delete : ");

   scanf("%ch", &ch);

   del(str, ch);

   getch();

}

void del(char str[], char ch)

{

   int i, j = 0;

   int size;

   char ch1;

   char str1[10];

   size = strlen(str);

   for (i = 0; i < size; i++)

   {

      if (str[i] != ch)

       {

         ch1 = str[i];

         str1[j] = ch1;

         j++;

      }

   }

   str1[j] = '\0';

    printf("\ncorrected string is : %s", str1);

}

Output

Enter the string : abhiman

Enter character which you want to delete : a

Corrected string is : bhimn

Concat Two Strings without Using Library Function

#include

#include

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

int main()

{

   char s1[50], s2[30];

   printf("\nEnter String 1 :");

   gets(s1);

   printf("\nEnter String 2 :");

   gets(s2);

   concat(s1, s2);

   printf("nConcated string is :%s", s1);

   return (0);

}

void concat(char s1[], char s2[])

{

   int i, j;

    i = strlen(s1);

    for (j = 0; s2[j] != '\0'; i++, j++)

   {

      s1[i] = s2[j];

    }

    s1[i] = '\0';

}

Output

Enter String 1 : Pritesh

Enter String 2 : Taral

Concated string is : PriteshTaral

Compare Two Strings without Using Library Function

#include

#include

int main()

{

   char str1[30], str2[30];

   int i;

   printf("\nEnter two strings :");

   gets(str1);

   gets(str2);

   i = 0;

   while (str1[i] == str2[i] && str1[i] != '\0')

      i++;

   if (str1[i] > str2[i])

      printf("str1 > str2");

   else if (str1[i] < str2[i])

      printf("str1 < str2");

   else

      printf("str1 = str2");

   return (0);

}

Copy One String into Other without Using Library Function

#include

#include

int main()

 {

   char s1[100], s2[100];

   int i;

    printf("\nEnter the string :");

   gets(s1);

    i = 0;

   while (s1[i] != '\0')

   {

      s2[i] = s1[i];

      i++;

   }

   s2[i] = '\0';

   printf("\nCopied String is %s ", s2);

   return (0);

}

Output

Enter the string : c4learn

Copied String is c4learn

Program to Convert String to Integer

#include

#include

int main()

{

   int num;

   char marks[3];

   printf("Please Enter Marks : ");

   scanf("%s", marks);

   num = atoi(marks);

   printf("\nMarks : %d", num);

   return (0);

}

Output

Please Enter Marks : 76

Marks : 76

Check Whether Entered Character is Lowercase Letter or Not without using Library Function

#include

#include 

int main()

{

 char ch;

   printf("\nEnter The Character : ");

   scanf("%c", &ch);

   if (ch >= 'A' && ch <= 'Z')

   {

      printf("Character is uppercase Letters");

    }

    else if (ch >= 'a' && ch <= 'z')

     {

      printf("Character is Not Lowercase Letters");

     }

     else

     {

      printf("Non alphabet character");

      }

    return(0);

}

Output

Enter The Character : a

Character is Lowercase Letters