C character using library function

Check Whether Entered Character is Uppercase 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 Upper Case Letters");

   else

      printf("Character is Not Upper Case Letters");

    return (0);

}

Output

Enter The Character : A

Character is Uppercase Letters

Reverse String without Using Library Function

#include

#include

int main()

{

char str[100],temp;

int I,j=0;

printf("\n Enter the string: "”);

gets(str);

i=0;

j=strlen(str)-01;

while(i

{

str[i]str[i];

str[j]=temp;

i++;

j--;

}

printf("\n Reverse sting is %s",str);

return (0);

}

Output

Enter the string : Pritesh

Reverse string is : Hsetirp

With using User-defined Function Write a Program to Find Length of String

#include

#include 

int FindLength(char str[]);

int main()

{

   char str[100];

   int length;

   printf("\nEnter the String : ");

   gets(str);

   length = FindLength(str);

   printf("\nLength of the String is : %d", length);

   return(0);

}

int FindLength(char str[])

{

   int len = 0;

   while (str[len] != '\0')

      len++;

   return (len);

}

Find Length of String Using Library Function

#include

#include

int main()

{

   char str[100];

   int len;

   printf("\nEnter the String : ");

   gets(str);

   len = strlen(str);

   printf("\nLength of Given String : %d", len);

   return(0);

}

Search occurrence of Character in String

#include

#include

int main()

{

   char str[20], ch;

   int count = 0, i;

   printf("\nEnter a string : ");

   scanf("%s", &str);

   printf("\nEnter the character to be searched : ");

   scanf("%c", &ch);

   for (i = 0; str[i] != '\0'; i++)

  {

      if (str[i] == ch)

         count++;

   }

    if (count == 0)

      printf("\nCharacter '%c'is not present", ch);

   else

      printf("\nOccurence of character '%c' : %d", ch, count);

   return (0);

}

Output

First Run :

Enter a string : c4learn.blogspot.com

Enter the character to be searched : o

Occurence of character 'o' : 3

Second Run :

Enter a string : c4learn.blogspot.com

Enter the character to be searched : x

Character 'x'is not present