COMPUTER INNOVATIONS: Replace it with the Specified Word

Search a Word & Replace it with the Specified Word

#include

#include

#include

#include

char *rep_str(const char *s, const char *old, const char *new1)

    char *ret;

    int i, count = 0;

    int newlen = strlen(new1);

    int oldlen = strlen(old);

    for (i = 0; s[i] != '\0'; i++)

        if (strstr(&s[i], old) == &s[i])

            count++;

            i += oldlen - 1;

    ret = (char *)malloc(i + count * (newlen - oldlen));

    if (ret == NULL)

        exit(EXIT_FAILURE);

    i = 0;

    while (*s)

        if (strstr(s, old) == s)

            strcpy(&ret[i], new1);

            i += newlen;

            s += oldlen;

        else

        ret[i++] = *s++;

    ret[i] = '\0';

    return ret;

int main(void)

    char mystr[100], c[10], d[10];

    printf("Enter a string along with characters to be rep_strd:\n");

    gets(mystr);

    printf("Enter the character to be rep_strd:\n");

    scanf(" %s",c);

    printf("Enter the new character:\n");

    scanf(" %s",d);

    char *newstr = NULL;

    puts(mystr);

    newstr = rep_str(mystr, c,d);

    printf("%s\n", newstr);

    free(newstr);

    return 0;

getch();

Output

Enter a string along with characters to be rep_strd:

prrrogram C prrrogramming

Enter the character to be rep_strd:

rr

Enter the new character:

mmm

prrrogram C prrrogramming

pmmmrogram C pmmmrogramming

Find First and Last Occurrence of given Character in a String

#include

#include

#include

void main()

    int i, count = 0, pos1, pos2;

    char str[50], key, a[10];

    clrscr();

    printf("enter the string\n");

    scanf(" %[^\n]s", str);

    printf("enter character to be searched\n");

    scanf(" %c", &key);

    for (i = 0;i <= strlen(str);i++)

        if (key == str[i])

            count++;

            if (count  == 1)

                pos1 = i;

                pos2 = i;

                printf("%d\n", pos1 + 1);

            else

                pos2 = i;

    printf("%d\n", pos2 + 1);

getch();

Output

enter the string

welcome to sanfoundry's c programming class!

enter character to be searched

Display the Characters in Prime Position a given String

#include

#include

#include

void main()

    int i, j, k, count = 0;

    char str[50];

    clrscr();

    printf("enter string\n");

    scanf("%[^\n]s", str);

    k = strlen(str);

    printf("prime characters in a string are\n");

    for (i = 2;i <= k;i++)

        count = 0;

        for (j = 2;j <= k;j++)

            if (i % j == 0)

                count++;

        if (count == 1)

            printf("%c\n", str[i - 1]);

Output

enter string

welcome to sanfoundry c-programming class!

prime characters in a string are

Find All Possible Subsets of given Length in String

#include

#include

#include

char a[20];

int n, len, j;

void main()

    int i, index = 0, start = 0;

    clrscr();

    printf("Enter the string\n");

    scanf("%s", a);

    n = strlen(a);

    printf("enter input length\n");

    scanf("%d", &len);

    printf("The subsets are\n");

    for (i  =  1;i < = n;i++)

        if (index - start + 1  ==   i)

            if (i  ==   len)

                for (j  =  index;j < n;j++)

                    for (i  =  start;i < index;i++)

                        printf("%c", a[i]);

                    printf("%c\n", a[j]);

                if (start != i)

                    start++;

                    index = start;

            else

                index++;

 getch();

Output

Enter the string

programming

enter input length

The subsets are

pr

po

pg

pr

pa

pm

pm

pi

pn

pg

enter the string

programming

enter input length

The subsets are

prog

pror

proa

prom

prom

proi

pron

prog

Delete All Repeated Words in String

#include

#include

#include

void main()

    char a[100], b[20][20];

    int i, j = 0, k = 0, n, m;

    printf("enter the string\n");

    scanf("%[^\n]s", a);

    for (i = 0;a[i] != '\0';i++)

        if (a[i] == ' ')

            b[k][j] = '\0';

            k++;

            j = 0;

        else

            b[k][j] = a[i];

            j++;

    b[k][j] = '\0';

    for (i = 0;i <= k;i++)

        for (j = i + 1;j <= k;j++)

            if (strcmp(b[i], b[j]) == 0)

                for (m = j;m <= k;m++)

                    strcpy(b[m], b[m + 1]);

                k--;

    for (n = 0;n <= k;n++)

        printf("%s\n", b[n]);

 getch();

Output

enter the string

welcome to sanfoundry's c programming class ,  welcome again to c class !

welcome

to

sanfoundry's

programming

class

again

Count Number of Words in a given Text Or Sentence

#include

#include

#include

void main()

    char s[200];

    int count = 0, i;

    printf("enter the string\n");

    scanf("%[^\n]s", s);

    for (i = 0;s[i] != '\0';i++)

        if (s[i] == ' ')

            count++;

    printf("number of words in given string are: %d\n", count + 1);

    getch();

Output

enter the string

welcome to sanfoundry's c-programming class!

number of words in given string are: 5

Find the Frequency of Substring in the given String

#include

#include

#include

void main()

    int count = 0, i, j = 0, k;

    char str[100], str1[20];

    clrscr();

    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 (i = 0;str[i] != '\0';)

        if (str[i] == ' ')

            i++;

        else

            if (str[i] == str1[j])

                j++;

                i++;

            else if (j == k)

                j = 0;

                count++;

                i--;

            else

                i++;

                j = 0;

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

getch();

Output

Enter the string

prrrogram is prrrogramming

Enter the substring to be matched

rr

No of matches of substring in main string is 4

COMPUTER INNOVATIONS