#### QUESTION-16 Find the Frequency of the Word ‘the’ in a given Sentence

```
void main()
{
int count = 0, i, times = 0, t, h, e, space;
char string[100];

puts("Enter a string:");
gets(string);
while (string[count] != '\0')
{
count++;
}

for (i = 0; i <= count - 3; i++)
{
t =(string[i] == 't' || string[i] == 'T');
h =(string[i + 1] == 'h' || string[i + 1] == 'H');
e =(string[i + 2] == 'e'|| string[i + 2] == 'E');
space =(string[i + 3] == ' ' || string[i + 3] == '\0');
if ((t && h && e && space) == 1)
times++;
}
printf("Frequency of the word 'the' is %d\n", times);
}
```

#### QUESTION-17 Read a String and find the Sum of all Digits in the String

```void main()
{
char string[80];
int count, nc = 0, sum = 0;

printf("Enter the string containing both digits and alphabet \n");
scanf("%s", string);
for (count = 0; string[count] != '\0'; count++)
{
if ((string[count] >= '0') && (string[count] <= '9'))
{
nc += 1;
sum += (string[count] - '0');
}
}
printf("NO. of Digits in the string = %d\n", nc);
printf("Sum of all digits = %d\n", sum);
}
```

#### QUESTION-18 Copy One String to Another using Recursion

```
void copy(char [], char [], int);

int main()
{
char str1[20], str2[20];

printf("Enter string to copy: ");
scanf("%s", str1);
copy(str1, str2, 0);
printf("Copying success.\n");
printf("The first string is: %s\n", str1);
printf("The second string is: %s\n", str2);
return 0;
}

void copy(char str1[], char str2[], int index)
{
str2[index] = str1[index];
if (str1[index] == '\0')
return;
copy(str1, str2, index + 1);
}
```

#### QUESTION-19 Check whether two Strings are Anagrams

```
int find_anagram(char [], char []);

int main()
{
char array1[100], array2[100];
int flag;

printf("Enter the string\n");
gets(array1);
printf("Enter another string\n");
gets(array2);
flag = find_anagram(array1, array2);
if (flag == 1)
printf(""%s" and "%s" are anagrams.\n", array1, array2);
else
printf(""%s" and "%s" are not anagrams.\n", array1, array2);
return 0;
}

int find_anagram(char array1[], char array2[])
{
int num1[26] = {0}, num2[26] = {0}, i = 0;

while (array1[i] != '\0')
{
num1[array1[i] - 'a']++;
i++;
}
i = 0;
while (array2[i] != '\0')
{
num2[array2[i] -'a']++;
i++;
}
for (i = 0; i < 26; i++)
{
if (num1[i] != num2[i])
return 0;
}
return 1;
}
```

#### QUESTION-20 Print the Words Ending with Letter S

```
char str[100];

void main()
{
int i, t, j, len;

printf("Enter a string : ");
scanf("%[^\n]s", str);

len = strlen(str);

str[len] = ' ';

for (t = 0, i = 0; i < strlen(str); i++)
{
if ((str[i] == ' ') && (str[i - 1] == 's'))
{
for (j = t; j < i; j++)
printf("%c", str[j]);
t = i + 1;
printf("\n");
}
else
{
if (str[i] == ' ')
{
t = i + 1;
}
}
}
}

```