String Interview Questions

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

Answer-

 
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

Answer-

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

Answer-

 
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

Answer-

 
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

Answer-

 
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;
            }
        }
    }
}