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C Programming Code Examples

C > Strings Code Examples

Find the Frequency of Substring in the given String

Find the Frequency of Substring in the given String

1. Take a string and a substring as input and store it in the arrays str[] and str1[] respectively.
2. Using for loop compare str1[] with the str[].
3. Do step-2 until the end of the main string.
4. During the comparison increment the variable count whenever the substring matches in the main string.
5. Print the variable count as output.

    #include <stdio.h>

    #include <string.h>

    void main()

    {

        int count = 0, x, j = 0, k;

        char str[88], str1[8];

        printf("Enter the string\n");

        scanf(" %[^\n]s", str);

        printf("Enter the substring to be matched\n");

        scanf(" %[^\n]s", str1);

        k = strlen(str1);

        for (x = 0;str[x] != '\0';)

        {

            if (str[x] == ' ')

            {

                x++;

            }

            else

            {

                if (str[x] == str1[j])

                {

                    j++;

                    x++;

                }

                else if (j == k)

                {

                    j = 0;

                    count++;

                    x--;

                }

                else

                {

                    x++;

                    j = 0;

                }

            }

        }

        printf("No of matches of substring in main string is %d\n", count);

    }

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